var-201906-1176

Vulnerability from variot

Jonathan Looney discovered that the TCP retransmission queue implementation in tcp_fragment in the Linux kernel could be fragmented when handling certain TCP Selective Acknowledgment (SACK) sequences. A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commit f070ef2ac66716357066b683fb0baf55f8191a2e. This vulnerability stems from improper management of system resources (such as memory, disk space, files, etc.) by network systems or products. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256

====================================================================
Red Hat Security Advisory

Synopsis: Important: kernel security and bug fix update Advisory ID: RHSA-2019:1488-01 Product: Red Hat Enterprise Linux Advisory URL: https://access.redhat.com/errata/RHSA-2019:1488 Issue date: 2019-06-17 CVE Names: CVE-2019-3896 CVE-2019-11477 CVE-2019-11478 CVE-2019-11479 ==================================================================== 1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 6) - i386, noarch, x86_64 Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64 Red Hat Enterprise Linux HPC Node (v. 6) - noarch, x86_64 Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64 Red Hat Enterprise Linux Server (v. 6) - i386, noarch, ppc64, s390x, x86_64 Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64 Red Hat Enterprise Linux Workstation (v. 6) - i386, noarch, x86_64 Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64

While processing SACK segments, the Linux kernel's socket buffer (SKB) data structure becomes fragmented. To efficiently process SACK blocks, the Linux kernel merges multiple fragmented SKBs into one, potentially overflowing the variable holding the number of segments. A remote attacker could use this flaw to crash the Linux kernel by sending a crafted sequence of SACK segments on a TCP connection with small value of TCP MSS, resulting in a denial of service (DoS). (CVE-2019-11477)
kernel: Double free in lib/idr.c (CVE-2019-3896)
Kernel: tcp: excessive resource consumption while processing SACK blocks allows remote denial of service (CVE-2019-11478)
Kernel: tcp: excessive resource consumption for TCP connections with low MSS allows remote denial of service (CVE-2019-11479)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Bug Fix(es):

MDS mitigations not enabled on Intel Skylake CPUs (BZ#1710081)
RHEL6 kernel does not disable SMT with mds=full,nosmt (BZ#1710121)
[RHEL6] md_clear flag missing from /proc/cpuinfo (BZ#1710517)
Solution:

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

Bugs fixed (https://bugzilla.redhat.com/):

1694812 - CVE-2019-3896 kernel: Double free in lib/idr.c 1719123 - CVE-2019-11477 Kernel: tcp: integer overflow while processing SACK blocks allows remote denial of service 1719128 - CVE-2019-11478 Kernel: tcp: excessive resource consumption while processing SACK blocks allows remote denial of service 1719129 - CVE-2019-11479 Kernel: tcp: excessive resource consumption for TCP connections with low MSS allows remote denial of service

Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source: kernel-2.6.32-754.15.3.el6.src.rpm

i386: kernel-2.6.32-754.15.3.el6.i686.rpm kernel-debug-2.6.32-754.15.3.el6.i686.rpm kernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm kernel-devel-2.6.32-754.15.3.el6.i686.rpm kernel-headers-2.6.32-754.15.3.el6.i686.rpm perf-2.6.32-754.15.3.el6.i686.rpm perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm

noarch: kernel-abi-whitelists-2.6.32-754.15.3.el6.noarch.rpm kernel-doc-2.6.32-754.15.3.el6.noarch.rpm kernel-firmware-2.6.32-754.15.3.el6.noarch.rpm

x86_64: kernel-2.6.32-754.15.3.el6.x86_64.rpm kernel-debug-2.6.32-754.15.3.el6.x86_64.rpm kernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm kernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm kernel-debug-devel-2.6.32-754.15.3.el6.x86_64.rpm kernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm kernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm kernel-devel-2.6.32-754.15.3.el6.x86_64.rpm kernel-headers-2.6.32-754.15.3.el6.x86_64.rpm perf-2.6.32-754.15.3.el6.x86_64.rpm perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

i386: kernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm kernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm python-perf-2.6.32-754.15.3.el6.i686.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm

x86_64: kernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm kernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm kernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm python-perf-2.6.32-754.15.3.el6.x86_64.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source: kernel-2.6.32-754.15.3.el6.src.rpm

noarch: kernel-abi-whitelists-2.6.32-754.15.3.el6.noarch.rpm kernel-doc-2.6.32-754.15.3.el6.noarch.rpm kernel-firmware-2.6.32-754.15.3.el6.noarch.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

Red Hat Enterprise Linux Server (v. 6):

Source: kernel-2.6.32-754.15.3.el6.src.rpm

noarch: kernel-abi-whitelists-2.6.32-754.15.3.el6.noarch.rpm kernel-doc-2.6.32-754.15.3.el6.noarch.rpm kernel-firmware-2.6.32-754.15.3.el6.noarch.rpm

ppc64: kernel-2.6.32-754.15.3.el6.ppc64.rpm kernel-bootwrapper-2.6.32-754.15.3.el6.ppc64.rpm kernel-debug-2.6.32-754.15.3.el6.ppc64.rpm kernel-debug-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm kernel-debug-devel-2.6.32-754.15.3.el6.ppc64.rpm kernel-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm kernel-debuginfo-common-ppc64-2.6.32-754.15.3.el6.ppc64.rpm kernel-devel-2.6.32-754.15.3.el6.ppc64.rpm kernel-headers-2.6.32-754.15.3.el6.ppc64.rpm perf-2.6.32-754.15.3.el6.ppc64.rpm perf-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm

s390x: kernel-2.6.32-754.15.3.el6.s390x.rpm kernel-debug-2.6.32-754.15.3.el6.s390x.rpm kernel-debug-debuginfo-2.6.32-754.15.3.el6.s390x.rpm kernel-debug-devel-2.6.32-754.15.3.el6.s390x.rpm kernel-debuginfo-2.6.32-754.15.3.el6.s390x.rpm kernel-debuginfo-common-s390x-2.6.32-754.15.3.el6.s390x.rpm kernel-devel-2.6.32-754.15.3.el6.s390x.rpm kernel-headers-2.6.32-754.15.3.el6.s390x.rpm kernel-kdump-2.6.32-754.15.3.el6.s390x.rpm kernel-kdump-debuginfo-2.6.32-754.15.3.el6.s390x.rpm kernel-kdump-devel-2.6.32-754.15.3.el6.s390x.rpm perf-2.6.32-754.15.3.el6.s390x.rpm perf-debuginfo-2.6.32-754.15.3.el6.s390x.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.s390x.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

ppc64: kernel-debug-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm kernel-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm kernel-debuginfo-common-ppc64-2.6.32-754.15.3.el6.ppc64.rpm perf-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm python-perf-2.6.32-754.15.3.el6.ppc64.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm

s390x: kernel-debug-debuginfo-2.6.32-754.15.3.el6.s390x.rpm kernel-debuginfo-2.6.32-754.15.3.el6.s390x.rpm kernel-debuginfo-common-s390x-2.6.32-754.15.3.el6.s390x.rpm kernel-kdump-debuginfo-2.6.32-754.15.3.el6.s390x.rpm perf-debuginfo-2.6.32-754.15.3.el6.s390x.rpm python-perf-2.6.32-754.15.3.el6.s390x.rpm python-perf-debuginfo-2.6.32-754.15.3.el6.s390x.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source: kernel-2.6.32-754.15.3.el6.src.rpm

noarch: kernel-abi-whitelists-2.6.32-754.15.3.el6.noarch.rpm kernel-doc-2.6.32-754.15.3.el6.noarch.rpm kernel-firmware-2.6.32-754.15.3.el6.noarch.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from https://access.redhat.com/security/team/key/

References:

https://access.redhat.com/security/cve/CVE-2019-3896 https://access.redhat.com/security/cve/CVE-2019-11477 https://access.redhat.com/security/cve/CVE-2019-11478 https://access.redhat.com/security/cve/CVE-2019-11479 https://access.redhat.com/security/updates/classification/#important https://access.redhat.com/security/vulnerabilities/tcpsack

Contact:

The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/

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-- RHSA-announce mailing list RHSA-announce@redhat.com https://www.redhat.com/mailman/listinfo/rhsa-announce . ========================================================================== Kernel Live Patch Security Notice 0058-1 October 22, 2019

linux vulnerability

A security issue affects these releases of Ubuntu:

| Series | Base kernel | Arch | flavors | |------------------+--------------+----------+------------------| | Ubuntu 18.04 LTS | 4.15.0 | amd64 | aws | | Ubuntu 18.04 LTS | 4.15.0 | amd64 | generic | | Ubuntu 18.04 LTS | 4.15.0 | amd64 | lowlatency | | Ubuntu 18.04 LTS | 4.15.0 | amd64 | oem | | Ubuntu 18.04 LTS | 5.0.0 | amd64 | azure | | Ubuntu 14.04 LTS | 4.4.0 | amd64 | generic | | Ubuntu 14.04 LTS | 4.4.0 | amd64 | lowlatency | | Ubuntu 16.04 LTS | 4.4.0 | amd64 | aws | | Ubuntu 16.04 LTS | 4.4.0 | amd64 | generic | | Ubuntu 16.04 LTS | 4.4.0 | amd64 | lowlatency | | Ubuntu 16.04 LTS | 4.15.0 | amd64 | azure | | Ubuntu 16.04 LTS | 4.15.0 | amd64 | generic | | Ubuntu 16.04 LTS | 4.15.0 | amd64 | lowlatency |

Summary:

Several security issues were fixed in the kernel.

Software Description: - linux: Linux kernel

Details:

It was discovered that a race condition existed in the GFS2 file system in the Linux kernel. (CVE-2016-10905)

It was discovered that a use-after-free error existed in the block layer subsystem of the Linux kernel when certain failure conditions occurred. (CVE-2018-20856)

It was discovered that the USB gadget Midi driver in the Linux kernel contained a double-free vulnerability when handling certain error conditions. (CVE-2018-20961)

It was discovered that the XFS file system in the Linux kernel did not properly handle mount failures in some situations. (CVE-2018-20976)

It was discovered that the RSI 91x Wi-Fi driver in the Linux kernel did not did not handle detach operations correctly, leading to a use-after-free vulnerability. (CVE-2018-21008)

It was discovered that the Intel Wi-Fi device driver in the Linux kernel did not properly validate certain Tunneled Direct Link Setup (TDLS). (CVE-2019-0136)

It was discovered that the Linux kernel on ARM processors allowed a tracing process to modify a syscall after a seccomp decision had been made on that syscall. (CVE-2019-2054)

It was discovered that an integer overflow existed in the Binder implementation of the Linux kernel, leading to a buffer overflow. (CVE-2019-2181)

It was discovered that the Marvell Wireless LAN device driver in the Linux kernel did not properly validate the BSS descriptor. (CVE-2019-3846)

It was discovered that a heap buffer overflow existed in the Marvell Wireless LAN device driver for the Linux kernel. (CVE-2019-10126)

It was discovered that the Bluetooth UART implementation in the Linux kernel did not properly check for missing tty operations. (CVE-2019-11478)

It was discovered that the ext4 file system implementation in the Linux kernel did not properly zero out memory in some situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2019-11833)

It was discovered that the PowerPC dlpar implementation in the Linux kernel did not properly check for allocation errors in some situations. (CVE-2019-12614)

It was discovered that the floppy driver in the Linux kernel did not properly validate meta data, leading to a buffer overread. (CVE-2019-14283)

It was discovered that the floppy driver in the Linux kernel did not properly validate ioctl() calls, leading to a division-by-zero. (CVE-2019-14284)

Wen Huang discovered that the Marvell Wi-Fi device driver in the Linux kernel did not properly perform bounds checking, leading to a heap overflow. (CVE-2019-14814)

Wen Huang discovered that the Marvell Wi-Fi device driver in the Linux kernel did not properly perform bounds checking, leading to a heap overflow. (CVE-2019-14815)

Wen Huang discovered that the Marvell Wi-Fi device driver in the Linux kernel did not properly perform bounds checking, leading to a heap overflow. (CVE-2019-14816)

Matt Delco discovered that the KVM hypervisor implementation in the Linux kernel did not properly perform bounds checking when handling coalesced MMIO write operations. (CVE-2019-14821)

Peter Pi discovered a buffer overflow in the virtio network backend (vhost_net) implementation in the Linux kernel. (CVE-2019-14835)

Update instructions:

The problem can be corrected by updating your livepatches to the following versions:

| Kernel | Version | flavors | |--------------------------+----------+--------------------------| | 4.4.0-148.174 | 58.1 | lowlatency, generic | | 4.4.0-148.174~14.04.1 | 58.1 | lowlatency, generic | | 4.4.0-150.176 | 58.1 | generic, lowlatency | | 4.4.0-150.176~14.04.1 | 58.1 | lowlatency, generic | | 4.4.0-151.178 | 58.1 | lowlatency, generic | | 4.4.0-151.178~14.04.1 | 58.1 | generic, lowlatency | | 4.4.0-154.181 | 58.1 | lowlatency, generic | | 4.4.0-154.181~14.04.1 | 58.1 | generic, lowlatency | | 4.4.0-157.185 | 58.1 | lowlatency, generic | | 4.4.0-157.185~14.04.1 | 58.1 | generic, lowlatency | | 4.4.0-159.187 | 58.1 | lowlatency, generic | | 4.4.0-159.187~14.04.1 | 58.1 | generic, lowlatency | | 4.4.0-161.189 | 58.1 | lowlatency, generic | | 4.4.0-161.189~14.04.1 | 58.1 | lowlatency, generic | | 4.4.0-164.192 | 58.1 | lowlatency, generic | | 4.4.0-164.192~14.04.1 | 58.1 | lowlatency, generic | | 4.4.0-165.193 | 58.1 | generic, lowlatency | | 4.4.0-1083.93 | 58.1 | aws | | 4.4.0-1084.94 | 58.1 | aws | | 4.4.0-1085.96 | 58.1 | aws | | 4.4.0-1087.98 | 58.1 | aws | | 4.4.0-1088.99 | 58.1 | aws | | 4.4.0-1090.101 | 58.1 | aws | | 4.4.0-1092.103 | 58.1 | aws | | 4.4.0-1094.105 | 58.1 | aws | | 4.15.0-50.54 | 58.1 | generic, lowlatency | | 4.15.0-50.54~16.04.1 | 58.1 | generic, lowlatency | | 4.15.0-51.55 | 58.1 | generic, lowlatency | | 4.15.0-51.55~16.04.1 | 58.1 | generic, lowlatency | | 4.15.0-52.56 | 58.1 | lowlatency, generic | | 4.15.0-52.56~16.04.1 | 58.1 | generic, lowlatency | | 4.15.0-54.58 | 58.1 | generic, lowlatency | | 4.15.0-54.58~16.04.1 | 58.1 | generic, lowlatency | | 4.15.0-55.60 | 58.1 | generic, lowlatency | | 4.15.0-58.64 | 58.1 | generic, lowlatency | | 4.15.0-58.64~16.04.1 | 58.1 | lowlatency, generic | | 4.15.0-60.67 | 58.1 | lowlatency, generic | | 4.15.0-60.67~16.04.1 | 58.1 | generic, lowlatency | | 4.15.0-62.69 | 58.1 | generic, lowlatency | | 4.15.0-62.69~16.04.1 | 58.1 | lowlatency, generic | | 4.15.0-64.73 | 58.1 | generic, lowlatency | | 4.15.0-64.73~16.04.1 | 58.1 | lowlatency, generic | | 4.15.0-65.74 | 58.1 | lowlatency, generic | | 4.15.0-1038.43 | 58.1 | oem | | 4.15.0-1039.41 | 58.1 | aws | | 4.15.0-1039.44 | 58.1 | oem | | 4.15.0-1040.42 | 58.1 | aws | | 4.15.0-1041.43 | 58.1 | aws | | 4.15.0-1043.45 | 58.1 | aws | | 4.15.0-1043.48 | 58.1 | oem | | 4.15.0-1044.46 | 58.1 | aws | | 4.15.0-1045.47 | 58.1 | aws | | 4.15.0-1045.50 | 58.1 | oem | | 4.15.0-1047.49 | 58.1 | aws | | 4.15.0-1047.51 | 58.1 | azure | | 4.15.0-1048.50 | 58.1 | aws | | 4.15.0-1049.54 | 58.1 | azure | | 4.15.0-1050.52 | 58.1 | aws | | 4.15.0-1050.55 | 58.1 | azure | | 4.15.0-1050.57 | 58.1 | oem | | 4.15.0-1051.53 | 58.1 | aws | | 4.15.0-1051.56 | 58.1 | azure | | 4.15.0-1052.57 | 58.1 | azure | | 4.15.0-1055.60 | 58.1 | azure | | 4.15.0-1056.61 | 58.1 | azure | | 4.15.0-1056.65 | 58.1 | oem | | 4.15.0-1057.62 | 58.1 | azure | | 4.15.0-1057.66 | 58.1 | oem | | 4.15.0-1059.64 | 58.1 | azure | | 5.0.0-1014.14~18.04.1 | 58.1 | azure | | 5.0.0-1016.17~18.04.1 | 58.1 | azure | | 5.0.0-1018.19~18.04.1 | 58.1 | azure | | 5.0.0-1020.21~18.04.1 | 58.1 | azure |

Support Information:

Kernels older than the levels listed below do not receive livepatch updates. Please upgrade your kernel as soon as possible.

| Series | Version | Flavors | |------------------+------------------+--------------------------| | Ubuntu 18.04 LTS | 4.15.0-1039 | aws | | Ubuntu 16.04 LTS | 4.4.0-1083 | aws | | Ubuntu 18.04 LTS | 5.0.0-1000 | azure | | Ubuntu 16.04 LTS | 4.15.0-1047 | azure | | Ubuntu 18.04 LTS | 4.15.0-50 | generic lowlatency | | Ubuntu 16.04 LTS | 4.15.0-50 | generic lowlatency | | Ubuntu 14.04 LTS | 4.4.0-148 | generic lowlatency | | Ubuntu 18.04 LTS | 4.15.0-1038 | oem | | Ubuntu 16.04 LTS | 4.4.0-148 | generic lowlatency |

References: CVE-2016-10905, CVE-2018-20856, CVE-2018-20961, CVE-2018-20976, CVE-2018-21008, CVE-2019-0136, CVE-2019-2054, CVE-2019-2181, CVE-2019-3846, CVE-2019-10126, CVE-2019-10207, CVE-2019-11477, CVE-2019-11478, CVE-2019-11833, CVE-2019-12614, CVE-2019-14283, CVE-2019-14284, CVE-2019-14814, CVE-2019-14815, CVE-2019-14816, CVE-2019-14821, CVE-2019-14835

-- ubuntu-security-announce mailing list ubuntu-security-announce@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-security-announce . 7) - x86_64

Description:

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

CVE-2019-5489

Daniel Gruss, Erik Kraft, Trishita Tiwari, Michael Schwarz, Ari
Trachtenberg, Jason Hennessey, Alex Ionescu, and Anders Fogh
discovered that local users could use the mincore() system call to
obtain sensitive information from other processes that access the
same memory-mapped file.

This update introduces a new sysctl value to control the minimal MSS
(net.ipv4.tcp_min_snd_mss), which by default uses the formerly hard-
coded value of 48.  We recommend raising this to 536 unless you know
that your network requires a lower value.

CVE-2019-11486

Jann Horn of Google reported numerous race conditions in the
Siemens R3964 line discipline. This module has therefore been
disabled.

CVE-2019-11599

Jann Horn of Google reported a race condition in the core dump
implementation which could lead to a use-after-free.

CVE-2019-11815

It was discovered that a use-after-free in the Reliable Datagram
Sockets protocol could result in denial of service and potentially
privilege escalation.  This protocol module (rds) is not auto-
loaded on Debian systems, so this issue only affects systems where
it is explicitly loaded.  A
local user able to write to an ext4 filesystem and then read the
filesystem image, for example using a removable drive, might be
able to use this to obtain sensitive information.

CVE-2019-11884

It was discovered that the Bluetooth HIDP implementation did not
ensure that new connection names were null-terminated.

For the detailed security status of linux please refer to its security tracker page at: https://security-tracker.debian.org/tracker/linux

Further information about Debian Security Advisories, how to apply these updates to your system and frequently asked questions can be found at: https://www.debian.org/security/

Mailing list: debian-security-announce@lists.debian.org -----BEGIN PGP SIGNATURE-----

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Update instructions:

The problem can be corrected by updating your system to the following package versions:

Ubuntu 14.04 ESM: linux-image-3.13.0-171-generic 3.13.0-171.222 linux-image-3.13.0-171-generic-lpae 3.13.0-171.222 linux-image-3.13.0-171-lowlatency 3.13.0-171.222 linux-image-4.15.0-1047-azure 4.15.0-1047.51~14.04.1 linux-image-4.4.0-1046-aws 4.4.0-1046.50 linux-image-4.4.0-151-generic 4.4.0-151.178~14.04.1 linux-image-4.4.0-151-generic-lpae 4.4.0-151.178~14.04.1 linux-image-4.4.0-151-lowlatency 4.4.0-151.178~14.04.1 linux-image-aws 4.4.0.1046.47 linux-image-azure 4.15.0.1047.34 linux-image-generic 3.13.0.171.182 linux-image-generic-lpae 3.13.0.171.182 linux-image-generic-lpae-lts-xenial 4.4.0.151.133 linux-image-generic-lts-xenial 4.4.0.151.133 linux-image-lowlatency-lts-xenial 4.4.0.151.133

Ubuntu 12.04 ESM: linux-image-3.13.0-171-generic 3.13.0-171.222~12.04.1 linux-image-3.13.0-171-generic-lpae 3.13.0-171.222~12.04.1 linux-image-3.13.0-171-lowlatency 3.13.0-171.222~12.04.1 linux-image-3.2.0-141-generic 3.2.0-141.188 linux-image-generic 3.2.0.141.156 linux-image-generic-lpae-lts-trusty 3.13.0.171.159 linux-image-generic-lts-trusty 3.13.0.171.159

After a standard system update you need to reboot your computer to make all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well. 7.2) - noarch, x86_64

Bug Fix(es):

THP: Race between MADV_DONTNEED and NUMA hinting node migration code (BZ#1698103)
[RHEL7] md_clear flag missing from /proc/cpuinfo on late microcode update (BZ#1712989)
[RHEL7] MDS mitigations are not enabled after double microcode update (BZ#1712994)
WARNING: CPU: 0 PID: 0 at kernel/jump_label.c:90 __static_key_slow_dec+0xa6/0xb0 (BZ#1713000)
7) - aarch64, noarch, ppc64le
These packages include redhat-release-virtualization-host, ovirt-node, and rhev-hypervisor. RHVH features a Cockpit user interface for monitoring the host's resources and performing administrative tasks. # Advisory

ID: NFLX-2019-001

Title: Linux and FreeBSD Kernel: Multiple TCP-based remote denial of service vulnerabilities

Release Date: 2019-06-17

Severity: Critical

Overview:

Netflix has identified several TCP networking vulnerabilities in FreeBSD and Linux kernels.

The vulnerabilities specifically relate to the minimum segment size (MSS) and TCP Selective Acknowledgement (SACK) capabilities. The most serious, dubbed “SACK Panic,” allows a remotely-triggered kernel panic on recent Linux kernels.

There are patches that address most of these vulnerabilities. If patches can not be applied, certain mitigations will be effective. We recommend that affected parties enact one of those described below, based on their environment.

Fix: Apply the patch PATCH_net_1_4.patch. Additionally, versions of the Linux kernel up to, and including, 4.14 require a second patch PATCH_net_1a.patch.

Workaround #1: Block connections with a low MSS using one of the supplied filters. (The values in the filters are examples. You can apply a higher or lower limit, as appropriate for your environment.) Note that these filters may break legitimate connections which rely on a low MSS. Also, note that this mitigation is only effective if TCP probing is disabled (that is, the net.ipv4.tcp_mtu_probing sysctl is set to 0, which appears to be the default value for that sysctl).

Workaround #2: Disable SACK processing (/proc/sys/net/ipv4/tcp_sack set to 0).

(Note that either workaround should be sufficient on its own. It is not necessary to apply both workarounds.)

2: CVE-2019-11478: SACK Slowness (Linux < 4.15) or Excess Resource Usage (all Linux versions)

Description: It is possible to send a crafted sequence of SACKs which will fragment the TCP retransmission queue. On Linux kernels prior to 4.15, an attacker may be able to further exploit the fragmented queue to cause an expensive linked-list walk for subsequent SACKs received for that same TCP connection.

Fix: Apply the patch PATCH_net_2_4.patch

Workaround #2: Disable SACK processing (/proc/sys/net/ipv4/tcp_sack set to 0).

(Note that either workaround should be sufficient on its own. It is not necessary to apply both workarounds.)

3: CVE-2019-5599: SACK Slowness (FreeBSD 12 using the RACK TCP Stack)

Description: It is possible to send a crafted sequence of SACKs which will fragment the RACK send map. An attacker may be able to further exploit the fragmented send map to cause an expensive linked-list walk for subsequent SACKs received for that same TCP connection.

Workaround #1: Apply the patch split_limit.patch and set the net.inet.tcp.rack.split_limit sysctl to a reasonable value to limit the size of the SACK table.

Workaround #2: Temporarily disable the RACK TCP stack.

(Note that either workaround should be sufficient on its own. It is not necessary to apply both workarounds.)

4: CVE-2019-11479: Excess Resource Consumption Due to Low MSS Values (all Linux versions)

Description: An attacker can force the Linux kernel to segment its responses into multiple TCP segments, each of which contains only 8 bytes of data. This drastically increases the bandwidth required to deliver the same amount of data. Further, it consumes additional resources (CPU and NIC processing power). This attack requires continued effort from the attacker and the impacts will end shortly after the attacker stops sending traffic.

Fix: Two patches PATCH_net_3_4.patch and PATCH_net_4_4.patch add a sysctl which enforces a minimum MSS, set by the net.ipv4.tcp_min_snd_mss sysctl. This lets an administrator enforce a minimum MSS appropriate for their applications.

Workaround: Block connections with a low MSS using one of the supplied filters. (The values in the filters are examples. You can apply a higher or lower limit, as appropriate for your environment.) Note that these filters may break legitimate connections which rely on a low MSS. Also, note that this mitigation is only effective if TCP probing is disabled (that is, the net.ipv4.tcp_mtu_probing sysctl is set to 0, which appears to be the default value for that sysctl).

Note:

Good system and application coding and configuration practices (limiting write buffers to the necessary level, monitoring connection memory consumption via SO_MEMINFO, and aggressively closing misbehaving connections) can help to limit the impact of attacks against these kinds of vulnerabilities.

Acknowledgments:

Originally reported by Jonathan Looney.

We thank Eric Dumazet for providing Linux fixes and support.

We thank Bruce Curtis for providing the Linux filters.

We thank Jonathan Lemon and Alexey Kodanev for helping to improve the Linux patches.

We gratefully acknowledge the assistance of Tyler Hicks in testing fixes, refining the information about vulnerable versions, and providing assistance during the disclosure process

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    "data": "Jonathan Looney discovered that the TCP retransmission queue implementation in tcp_fragment in the Linux kernel could be fragmented when handling certain TCP Selective Acknowledgment (SACK) sequences. A remote attacker could use this to cause a denial of service. This has been fixed in stable kernel releases 4.4.182, 4.9.182, 4.14.127, 4.19.52, 5.1.11, and is fixed in commit f070ef2ac66716357066b683fb0baf55f8191a2e. This vulnerability stems from improper management of system resources (such as memory, disk space, files, etc.) by network systems or products. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA256\n\n====================================================================                   \nRed Hat Security Advisory\n\nSynopsis:          Important: kernel security and bug fix update\nAdvisory ID:       RHSA-2019:1488-01\nProduct:           Red Hat Enterprise Linux\nAdvisory URL:      https://access.redhat.com/errata/RHSA-2019:1488\nIssue date:        2019-06-17\nCVE Names:         CVE-2019-3896 CVE-2019-11477 CVE-2019-11478\n                   CVE-2019-11479\n====================================================================\n1. Summary:\n\nAn update for kernel is now available for Red Hat Enterprise Linux 6. \n\nRed Hat Product Security has rated this update as having a security impact\nof Important. A Common Vulnerability Scoring System (CVSS) base score,\nwhich gives a detailed severity rating, is available for each vulnerability\nfrom the CVE link(s) in the References section. \n\n2. Relevant releases/architectures:\n\nRed Hat Enterprise Linux Desktop (v. 6) - i386, noarch, x86_64\nRed Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64\nRed Hat Enterprise Linux HPC Node (v. 6) - noarch, x86_64\nRed Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64\nRed Hat Enterprise Linux Server (v. 6) - i386, noarch, ppc64, s390x, x86_64\nRed Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64\nRed Hat Enterprise Linux Workstation (v. 6) - i386, noarch, x86_64\nRed Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64\n\n3. While processing SACK segments, the Linux kernel\u0027s socket buffer\n(SKB) data structure becomes fragmented. To efficiently process SACK blocks, the Linux\nkernel merges multiple fragmented SKBs into one, potentially overflowing\nthe variable holding the number of segments. A remote attacker could use\nthis flaw to crash the Linux kernel by sending a crafted sequence of SACK\nsegments on a TCP connection with small value of TCP MSS, resulting in a\ndenial of service (DoS). (CVE-2019-11477)\n\n* kernel: Double free in lib/idr.c (CVE-2019-3896)\n\n* Kernel: tcp: excessive resource consumption while processing SACK blocks\nallows remote denial of service (CVE-2019-11478)\n\n* Kernel: tcp: excessive resource consumption for TCP connections with low\nMSS allows remote denial of service (CVE-2019-11479)\n\nFor more details about the security issue(s), including the impact, a CVSS\nscore, acknowledgments, and other related information, refer to the CVE\npage(s) listed in the References section. \n\nBug Fix(es):\n\n* MDS mitigations not enabled on Intel Skylake CPUs (BZ#1710081)\n\n* RHEL6 kernel does not disable SMT with mds=full,nosmt (BZ#1710121)\n\n* [RHEL6] md_clear flag missing from /proc/cpuinfo (BZ#1710517)\n\n4. Solution:\n\nFor details on how to apply this update, which includes the changes\ndescribed in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect. \n\n5. Bugs fixed (https://bugzilla.redhat.com/):\n\n1694812 - CVE-2019-3896 kernel: Double free in lib/idr.c\n1719123 - CVE-2019-11477 Kernel: tcp: integer overflow while processing SACK blocks allows remote denial of service\n1719128 - CVE-2019-11478 Kernel: tcp: excessive resource consumption while processing SACK blocks allows remote denial of service\n1719129 - CVE-2019-11479 Kernel: tcp: excessive resource consumption for TCP connections with low MSS allows remote denial of service\n\n6. Package List:\n\nRed Hat Enterprise Linux Desktop (v. 6):\n\nSource:\nkernel-2.6.32-754.15.3.el6.src.rpm\n\ni386:\nkernel-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm\nkernel-devel-2.6.32-754.15.3.el6.i686.rpm\nkernel-headers-2.6.32-754.15.3.el6.i686.rpm\nperf-2.6.32-754.15.3.el6.i686.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\n\nnoarch:\nkernel-abi-whitelists-2.6.32-754.15.3.el6.noarch.rpm\nkernel-doc-2.6.32-754.15.3.el6.noarch.rpm\nkernel-firmware-2.6.32-754.15.3.el6.noarch.rpm\n\nx86_64:\nkernel-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debug-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-devel-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-headers-2.6.32-754.15.3.el6.x86_64.rpm\nperf-2.6.32-754.15.3.el6.x86_64.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\n\nRed Hat Enterprise Linux Desktop Optional (v. 6):\n\ni386:\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\npython-perf-2.6.32-754.15.3.el6.i686.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\n\nx86_64:\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\npython-perf-2.6.32-754.15.3.el6.x86_64.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\n\nRed Hat Enterprise Linux HPC Node (v. 6):\n\nSource:\nkernel-2.6.32-754.15.3.el6.src.rpm\n\nnoarch:\nkernel-abi-whitelists-2.6.32-754.15.3.el6.noarch.rpm\nkernel-doc-2.6.32-754.15.3.el6.noarch.rpm\nkernel-firmware-2.6.32-754.15.3.el6.noarch.rpm\n\nx86_64:\nkernel-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debug-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-devel-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-headers-2.6.32-754.15.3.el6.x86_64.rpm\nperf-2.6.32-754.15.3.el6.x86_64.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\n\nRed Hat Enterprise Linux HPC Node Optional (v. 6):\n\nx86_64:\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\npython-perf-2.6.32-754.15.3.el6.x86_64.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\n\nRed Hat Enterprise Linux Server (v. 6):\n\nSource:\nkernel-2.6.32-754.15.3.el6.src.rpm\n\ni386:\nkernel-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm\nkernel-devel-2.6.32-754.15.3.el6.i686.rpm\nkernel-headers-2.6.32-754.15.3.el6.i686.rpm\nperf-2.6.32-754.15.3.el6.i686.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\n\nnoarch:\nkernel-abi-whitelists-2.6.32-754.15.3.el6.noarch.rpm\nkernel-doc-2.6.32-754.15.3.el6.noarch.rpm\nkernel-firmware-2.6.32-754.15.3.el6.noarch.rpm\n\nppc64:\nkernel-2.6.32-754.15.3.el6.ppc64.rpm\nkernel-bootwrapper-2.6.32-754.15.3.el6.ppc64.rpm\nkernel-debug-2.6.32-754.15.3.el6.ppc64.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.ppc64.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm\nkernel-debuginfo-common-ppc64-2.6.32-754.15.3.el6.ppc64.rpm\nkernel-devel-2.6.32-754.15.3.el6.ppc64.rpm\nkernel-headers-2.6.32-754.15.3.el6.ppc64.rpm\nperf-2.6.32-754.15.3.el6.ppc64.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm\n\ns390x:\nkernel-2.6.32-754.15.3.el6.s390x.rpm\nkernel-debug-2.6.32-754.15.3.el6.s390x.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.s390x.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.s390x.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.s390x.rpm\nkernel-debuginfo-common-s390x-2.6.32-754.15.3.el6.s390x.rpm\nkernel-devel-2.6.32-754.15.3.el6.s390x.rpm\nkernel-headers-2.6.32-754.15.3.el6.s390x.rpm\nkernel-kdump-2.6.32-754.15.3.el6.s390x.rpm\nkernel-kdump-debuginfo-2.6.32-754.15.3.el6.s390x.rpm\nkernel-kdump-devel-2.6.32-754.15.3.el6.s390x.rpm\nperf-2.6.32-754.15.3.el6.s390x.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.s390x.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.s390x.rpm\n\nx86_64:\nkernel-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debug-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-devel-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-headers-2.6.32-754.15.3.el6.x86_64.rpm\nperf-2.6.32-754.15.3.el6.x86_64.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\n\nRed Hat Enterprise Linux Server Optional (v. 6):\n\ni386:\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\npython-perf-2.6.32-754.15.3.el6.i686.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\n\nppc64:\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm\nkernel-debuginfo-common-ppc64-2.6.32-754.15.3.el6.ppc64.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm\npython-perf-2.6.32-754.15.3.el6.ppc64.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.ppc64.rpm\n\ns390x:\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.s390x.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.s390x.rpm\nkernel-debuginfo-common-s390x-2.6.32-754.15.3.el6.s390x.rpm\nkernel-kdump-debuginfo-2.6.32-754.15.3.el6.s390x.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.s390x.rpm\npython-perf-2.6.32-754.15.3.el6.s390x.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.s390x.rpm\n\nx86_64:\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\npython-perf-2.6.32-754.15.3.el6.x86_64.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\n\nRed Hat Enterprise Linux Workstation (v. 6):\n\nSource:\nkernel-2.6.32-754.15.3.el6.src.rpm\n\ni386:\nkernel-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm\nkernel-devel-2.6.32-754.15.3.el6.i686.rpm\nkernel-headers-2.6.32-754.15.3.el6.i686.rpm\nperf-2.6.32-754.15.3.el6.i686.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\n\nnoarch:\nkernel-abi-whitelists-2.6.32-754.15.3.el6.noarch.rpm\nkernel-doc-2.6.32-754.15.3.el6.noarch.rpm\nkernel-firmware-2.6.32-754.15.3.el6.noarch.rpm\n\nx86_64:\nkernel-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debug-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.i686.rpm\nkernel-debug-devel-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-devel-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-headers-2.6.32-754.15.3.el6.x86_64.rpm\nperf-2.6.32-754.15.3.el6.x86_64.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\n\nRed Hat Enterprise Linux Workstation Optional (v. 6):\n\ni386:\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.i686.rpm\nkernel-debuginfo-common-i686-2.6.32-754.15.3.el6.i686.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\npython-perf-2.6.32-754.15.3.el6.i686.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.i686.rpm\n\nx86_64:\nkernel-debug-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\nkernel-debuginfo-common-x86_64-2.6.32-754.15.3.el6.x86_64.rpm\nperf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\npython-perf-2.6.32-754.15.3.el6.x86_64.rpm\npython-perf-debuginfo-2.6.32-754.15.3.el6.x86_64.rpm\n\nThese packages are GPG signed by Red Hat for security.  Our key and\ndetails on how to verify the signature are available from\nhttps://access.redhat.com/security/team/key/\n\n7. References:\n\nhttps://access.redhat.com/security/cve/CVE-2019-3896\nhttps://access.redhat.com/security/cve/CVE-2019-11477\nhttps://access.redhat.com/security/cve/CVE-2019-11478\nhttps://access.redhat.com/security/cve/CVE-2019-11479\nhttps://access.redhat.com/security/updates/classification/#important\nhttps://access.redhat.com/security/vulnerabilities/tcpsack\n\n8. Contact:\n\nThe Red Hat security contact is \u003csecalert@redhat.com\u003e. More contact\ndetails at https://access.redhat.com/security/team/contact/\n\nCopyright 2019 Red Hat, Inc. \n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG v1\n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\nl+p3rcEBzDA=NzJu\n-----END PGP SIGNATURE-----\n\n--\nRHSA-announce mailing list\nRHSA-announce@redhat.com\nhttps://www.redhat.com/mailman/listinfo/rhsa-announce\n. ==========================================================================\nKernel Live Patch Security Notice 0058-1\nOctober 22, 2019\n\nlinux vulnerability\n==========================================================================\n\nA security issue affects these releases of Ubuntu:\n\n| Series           | Base kernel  | Arch     | flavors          |\n|------------------+--------------+----------+------------------|\n| Ubuntu 18.04 LTS | 4.15.0       | amd64    | aws              |\n| Ubuntu 18.04 LTS | 4.15.0       | amd64    | generic          |\n| Ubuntu 18.04 LTS | 4.15.0       | amd64    | lowlatency       |\n| Ubuntu 18.04 LTS | 4.15.0       | amd64    | oem              |\n| Ubuntu 18.04 LTS | 5.0.0        | amd64    | azure            |\n| Ubuntu 14.04 LTS | 4.4.0        | amd64    | generic          |\n| Ubuntu 14.04 LTS | 4.4.0        | amd64    | lowlatency       |\n| Ubuntu 16.04 LTS | 4.4.0        | amd64    | aws              |\n| Ubuntu 16.04 LTS | 4.4.0        | amd64    | generic          |\n| Ubuntu 16.04 LTS | 4.4.0        | amd64    | lowlatency       |\n| Ubuntu 16.04 LTS | 4.15.0       | amd64    | azure            |\n| Ubuntu 16.04 LTS | 4.15.0       | amd64    | generic          |\n| Ubuntu 16.04 LTS | 4.15.0       | amd64    | lowlatency       |\n\nSummary:\n\nSeveral security issues were fixed in the kernel. \n\nSoftware Description:\n- linux: Linux kernel\n\nDetails:\n\nIt was discovered that a race condition existed in the GFS2 file system in\nthe Linux kernel. (CVE-2016-10905)\n\nIt was discovered that a use-after-free error existed in the block layer\nsubsystem of the Linux kernel when certain failure conditions occurred. (CVE-2018-20856)\n\nIt was discovered that the USB gadget Midi driver in the Linux kernel\ncontained a double-free vulnerability when handling certain error\nconditions. (CVE-2018-20961)\n\nIt was discovered that the XFS file system in the Linux kernel did not\nproperly handle mount failures in some situations. (CVE-2018-20976)\n\nIt was discovered that the RSI 91x Wi-Fi driver in the Linux kernel did not\ndid not handle detach operations correctly, leading to a use-after-free\nvulnerability. \n(CVE-2018-21008)\n\nIt was discovered that the Intel Wi-Fi device driver in the Linux kernel\ndid not properly validate certain Tunneled Direct Link Setup (TDLS). (CVE-2019-0136)\n\nIt was discovered that the Linux kernel on ARM processors allowed a tracing\nprocess to modify a syscall after a seccomp decision had been made on that\nsyscall. (CVE-2019-2054)\n\nIt was discovered that an integer overflow existed in the Binder\nimplementation of the Linux kernel, leading to a buffer overflow. (CVE-2019-2181)\n\nIt was discovered that the Marvell Wireless LAN device driver in the Linux\nkernel did not properly validate the BSS descriptor. (CVE-2019-3846)\n\nIt was discovered that a heap buffer overflow existed in the Marvell\nWireless LAN device driver for the Linux kernel. (CVE-2019-10126)\n\nIt was discovered that the Bluetooth UART implementation in the Linux\nkernel did not properly check for missing tty operations. (CVE-2019-11478)\n\nIt was discovered that the ext4 file system implementation in the Linux\nkernel did not properly zero out memory in some situations. A local\nattacker could use this to expose sensitive information (kernel memory). \n(CVE-2019-11833)\n\nIt was discovered that the PowerPC dlpar implementation in the Linux kernel\ndid not properly check for allocation errors in some situations. (CVE-2019-12614)\n\nIt was discovered that the floppy driver in the Linux kernel did not\nproperly validate meta data, leading to a buffer overread. \n(CVE-2019-14283)\n\nIt was discovered that the floppy driver in the Linux kernel did not\nproperly validate ioctl() calls, leading to a division-by-zero. \n(CVE-2019-14284)\n\nWen Huang discovered that the Marvell Wi-Fi device driver in the Linux\nkernel did not properly perform bounds checking, leading to a heap\noverflow. (CVE-2019-14814)\n\nWen Huang discovered that the Marvell Wi-Fi device driver in the Linux\nkernel did not properly perform bounds checking, leading to a heap\noverflow. (CVE-2019-14815)\n\nWen Huang discovered that the Marvell Wi-Fi device driver in the Linux\nkernel did not properly perform bounds checking, leading to a heap\noverflow. (CVE-2019-14816)\n\nMatt Delco discovered that the KVM hypervisor implementation in the Linux\nkernel did not properly perform bounds checking when handling coalesced\nMMIO write operations. (CVE-2019-14821)\n\nPeter Pi discovered a buffer overflow in the virtio network backend\n(vhost_net) implementation in the Linux kernel. (CVE-2019-14835)\n\nUpdate instructions:\n\nThe problem can be corrected by updating your livepatches to the following\nversions:\n\n| Kernel                   | Version  | flavors                  |\n|--------------------------+----------+--------------------------|\n| 4.4.0-148.174            | 58.1     | lowlatency, generic      |\n| 4.4.0-148.174~14.04.1    | 58.1     | lowlatency, generic      |\n| 4.4.0-150.176            | 58.1     | generic, lowlatency      |\n| 4.4.0-150.176~14.04.1    | 58.1     | lowlatency, generic      |\n| 4.4.0-151.178            | 58.1     | lowlatency, generic      |\n| 4.4.0-151.178~14.04.1    | 58.1     | generic, lowlatency      |\n| 4.4.0-154.181            | 58.1     | lowlatency, generic      |\n| 4.4.0-154.181~14.04.1    | 58.1     | generic, lowlatency      |\n| 4.4.0-157.185            | 58.1     | lowlatency, generic      |\n| 4.4.0-157.185~14.04.1    | 58.1     | generic, lowlatency      |\n| 4.4.0-159.187            | 58.1     | lowlatency, generic      |\n| 4.4.0-159.187~14.04.1    | 58.1     | generic, lowlatency      |\n| 4.4.0-161.189            | 58.1     | lowlatency, generic      |\n| 4.4.0-161.189~14.04.1    | 58.1     | lowlatency, generic      |\n| 4.4.0-164.192            | 58.1     | lowlatency, generic      |\n| 4.4.0-164.192~14.04.1    | 58.1     | lowlatency, generic      |\n| 4.4.0-165.193            | 58.1     | generic, lowlatency      |\n| 4.4.0-1083.93            | 58.1     | aws                      |\n| 4.4.0-1084.94            | 58.1     | aws                      |\n| 4.4.0-1085.96            | 58.1     | aws                      |\n| 4.4.0-1087.98            | 58.1     | aws                      |\n| 4.4.0-1088.99            | 58.1     | aws                      |\n| 4.4.0-1090.101           | 58.1     | aws                      |\n| 4.4.0-1092.103           | 58.1     | aws                      |\n| 4.4.0-1094.105           | 58.1     | aws                      |\n| 4.15.0-50.54             | 58.1     | generic, lowlatency      |\n| 4.15.0-50.54~16.04.1     | 58.1     | generic, lowlatency      |\n| 4.15.0-51.55             | 58.1     | generic, lowlatency      |\n| 4.15.0-51.55~16.04.1     | 58.1     | generic, lowlatency      |\n| 4.15.0-52.56             | 58.1     | lowlatency, generic      |\n| 4.15.0-52.56~16.04.1     | 58.1     | generic, lowlatency      |\n| 4.15.0-54.58             | 58.1     | generic, lowlatency      |\n| 4.15.0-54.58~16.04.1     | 58.1     | generic, lowlatency      |\n| 4.15.0-55.60             | 58.1     | generic, lowlatency      |\n| 4.15.0-58.64             | 58.1     | generic, lowlatency      |\n| 4.15.0-58.64~16.04.1     | 58.1     | lowlatency, generic      |\n| 4.15.0-60.67             | 58.1     | lowlatency, generic      |\n| 4.15.0-60.67~16.04.1     | 58.1     | generic, lowlatency      |\n| 4.15.0-62.69             | 58.1     | generic, lowlatency      |\n| 4.15.0-62.69~16.04.1     | 58.1     | lowlatency, generic      |\n| 4.15.0-64.73             | 58.1     | generic, lowlatency      |\n| 4.15.0-64.73~16.04.1     | 58.1     | lowlatency, generic      |\n| 4.15.0-65.74             | 58.1     | lowlatency, generic      |\n| 4.15.0-1038.43           | 58.1     | oem                      |\n| 4.15.0-1039.41           | 58.1     | aws                      |\n| 4.15.0-1039.44           | 58.1     | oem                      |\n| 4.15.0-1040.42           | 58.1     | aws                      |\n| 4.15.0-1041.43           | 58.1     | aws                      |\n| 4.15.0-1043.45           | 58.1     | aws                      |\n| 4.15.0-1043.48           | 58.1     | oem                      |\n| 4.15.0-1044.46           | 58.1     | aws                      |\n| 4.15.0-1045.47           | 58.1     | aws                      |\n| 4.15.0-1045.50           | 58.1     | oem                      |\n| 4.15.0-1047.49           | 58.1     | aws                      |\n| 4.15.0-1047.51           | 58.1     | azure                    |\n| 4.15.0-1048.50           | 58.1     | aws                      |\n| 4.15.0-1049.54           | 58.1     | azure                    |\n| 4.15.0-1050.52           | 58.1     | aws                      |\n| 4.15.0-1050.55           | 58.1     | azure                    |\n| 4.15.0-1050.57           | 58.1     | oem                      |\n| 4.15.0-1051.53           | 58.1     | aws                      |\n| 4.15.0-1051.56           | 58.1     | azure                    |\n| 4.15.0-1052.57           | 58.1     | azure                    |\n| 4.15.0-1055.60           | 58.1     | azure                    |\n| 4.15.0-1056.61           | 58.1     | azure                    |\n| 4.15.0-1056.65           | 58.1     | oem                      |\n| 4.15.0-1057.62           | 58.1     | azure                    |\n| 4.15.0-1057.66           | 58.1     | oem                      |\n| 4.15.0-1059.64           | 58.1     | azure                    |\n| 5.0.0-1014.14~18.04.1    | 58.1     | azure                    |\n| 5.0.0-1016.17~18.04.1    | 58.1     | azure                    |\n| 5.0.0-1018.19~18.04.1    | 58.1     | azure                    |\n| 5.0.0-1020.21~18.04.1    | 58.1     | azure                    |\n\nSupport Information:\n\nKernels older than the levels listed below do not receive livepatch\nupdates. Please upgrade your kernel as soon as possible. \n\n| Series           | Version          | Flavors                  |\n|------------------+------------------+--------------------------|\n| Ubuntu 18.04 LTS | 4.15.0-1039      | aws                      |\n| Ubuntu 16.04 LTS | 4.4.0-1083       | aws                      |\n| Ubuntu 18.04 LTS | 5.0.0-1000       | azure                    |\n| Ubuntu 16.04 LTS | 4.15.0-1047      | azure                    |\n| Ubuntu 18.04 LTS | 4.15.0-50        | generic lowlatency       |\n| Ubuntu 16.04 LTS | 4.15.0-50        | generic lowlatency       |\n| Ubuntu 14.04 LTS | 4.4.0-148        | generic lowlatency       |\n| Ubuntu 18.04 LTS | 4.15.0-1038      | oem                      |\n| Ubuntu 16.04 LTS | 4.4.0-148        | generic lowlatency       |\n\nReferences:\n  CVE-2016-10905, CVE-2018-20856, CVE-2018-20961, CVE-2018-20976, \n  CVE-2018-21008, CVE-2019-0136, CVE-2019-2054, CVE-2019-2181, \n  CVE-2019-3846, CVE-2019-10126, CVE-2019-10207, CVE-2019-11477, \n  CVE-2019-11478, CVE-2019-11833, CVE-2019-12614, CVE-2019-14283, \n  CVE-2019-14284, CVE-2019-14814, CVE-2019-14815, CVE-2019-14816, \n  CVE-2019-14821, CVE-2019-14835\n\n\n-- \nubuntu-security-announce mailing list\nubuntu-security-announce@lists.ubuntu.com\nModify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-security-announce\n. 7) - x86_64\n\n3. Description:\n\nThe kernel-rt packages provide the Real Time Linux Kernel, which enables\nfine-tuning for systems with extremely high determinism requirements. \n\nCVE-2019-5489\n\n    Daniel Gruss, Erik Kraft, Trishita Tiwari, Michael Schwarz, Ari\n    Trachtenberg, Jason Hennessey, Alex Ionescu, and Anders Fogh\n    discovered that local users could use the mincore() system call to\n    obtain sensitive information from other processes that access the\n    same memory-mapped file. \n\n    This update introduces a new sysctl value to control the minimal MSS\n    (net.ipv4.tcp_min_snd_mss), which by default uses the formerly hard-\n    coded value of 48.  We recommend raising this to 536 unless you know\n    that your network requires a lower value. \n\nCVE-2019-11486\n\n    Jann Horn of Google reported numerous race conditions in the\n    Siemens R3964 line discipline. This module has therefore been\n    disabled. \n\nCVE-2019-11599\n\n    Jann Horn of Google reported a race condition in the core dump\n    implementation which could lead to a use-after-free. \n\nCVE-2019-11815\n\n    It was discovered that a use-after-free in the Reliable Datagram\n    Sockets protocol could result in denial of service and potentially\n    privilege escalation.  This protocol module (rds) is not auto-\n    loaded on Debian systems, so this issue only affects systems where\n    it is explicitly loaded.  A\n    local user able to write to an ext4 filesystem and then read the\n    filesystem image, for example using a removable drive, might be\n    able to use this to obtain sensitive information. \n\nCVE-2019-11884\n\n    It was discovered that the Bluetooth HIDP implementation did not\n    ensure that new connection names were null-terminated. \n\nFor the detailed security status of linux please refer to its security\ntracker page at:\nhttps://security-tracker.debian.org/tracker/linux\n\nFurther information about Debian Security Advisories, how to apply\nthese updates to your system and frequently asked questions can be\nfound at: https://www.debian.org/security/\n\nMailing list: debian-security-announce@lists.debian.org\n-----BEGIN PGP SIGNATURE-----\n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\nNwCQrSCaGk2nwBZr6Xs0qYVTsLLY9jkg8FUWPdH4ZEOFcGaWi3A=dgfy\n-----END PGP SIGNATURE-----\n. \n(CVE-2019-11477)\n\nUpdate instructions:\n\nThe problem can be corrected by updating your system to the following\npackage versions:\n\nUbuntu 14.04 ESM:\n  linux-image-3.13.0-171-generic  3.13.0-171.222\n  linux-image-3.13.0-171-generic-lpae  3.13.0-171.222\n  linux-image-3.13.0-171-lowlatency  3.13.0-171.222\n  linux-image-4.15.0-1047-azure   4.15.0-1047.51~14.04.1\n  linux-image-4.4.0-1046-aws      4.4.0-1046.50\n  linux-image-4.4.0-151-generic   4.4.0-151.178~14.04.1\n  linux-image-4.4.0-151-generic-lpae  4.4.0-151.178~14.04.1\n  linux-image-4.4.0-151-lowlatency  4.4.0-151.178~14.04.1\n  linux-image-aws                 4.4.0.1046.47\n  linux-image-azure               4.15.0.1047.34\n  linux-image-generic             3.13.0.171.182\n  linux-image-generic-lpae        3.13.0.171.182\n  linux-image-generic-lpae-lts-xenial  4.4.0.151.133\n  linux-image-generic-lts-xenial  4.4.0.151.133\n  linux-image-lowlatency-lts-xenial  4.4.0.151.133\n\nUbuntu 12.04 ESM:\n  linux-image-3.13.0-171-generic  3.13.0-171.222~12.04.1\n  linux-image-3.13.0-171-generic-lpae  3.13.0-171.222~12.04.1\n  linux-image-3.13.0-171-lowlatency  3.13.0-171.222~12.04.1\n  linux-image-3.2.0-141-generic   3.2.0-141.188\n  linux-image-generic             3.2.0.141.156\n  linux-image-generic-lpae-lts-trusty  3.13.0.171.159\n  linux-image-generic-lts-trusty  3.13.0.171.159\n\nAfter a standard system update you need to reboot your computer to make\nall the necessary changes. \n\nATTENTION: Due to an unavoidable ABI change the kernel updates have\nbeen given a new version number, which requires you to recompile and\nreinstall all third party kernel modules you might have installed. \nUnless you manually uninstalled the standard kernel metapackages\n(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,\nlinux-powerpc), a standard system upgrade will automatically perform\nthis as well. 7.2) - noarch, x86_64\n\n3. \n\nBug Fix(es):\n\n* THP: Race between MADV_DONTNEED and NUMA hinting node migration code\n(BZ#1698103)\n\n* [RHEL7] md_clear flag missing from /proc/cpuinfo on late microcode update\n(BZ#1712989)\n\n* [RHEL7] MDS mitigations are not enabled after double microcode update\n(BZ#1712994)\n\n* WARNING: CPU: 0 PID: 0 at kernel/jump_label.c:90\n__static_key_slow_dec+0xa6/0xb0 (BZ#1713000)\n\n4. 7) - aarch64, noarch, ppc64le\n\n3. These packages include redhat-release-virtualization-host,\novirt-node, and rhev-hypervisor. RHVH features a Cockpit user\ninterface for monitoring the host\u0027s resources and performing administrative\ntasks. # Advisory\n###### ID: NFLX-2019-001\n\n###### Title: Linux and FreeBSD Kernel: Multiple TCP-based remote denial of service vulnerabilities\n\n###### Release Date: 2019-06-17\n\n###### Severity: Critical\n\n### Overview:\n\nNetflix has identified several TCP networking vulnerabilities in FreeBSD and Linux kernels. \n\nThe vulnerabilities specifically relate to the minimum segment size (MSS) and TCP Selective Acknowledgement (SACK) capabilities. The most serious, dubbed _\u201cSACK Panic_,\u201d allows a remotely-triggered kernel panic on recent Linux kernels. \n\nThere are patches that address most of these vulnerabilities. If patches can not be applied, certain mitigations will be effective. We recommend that affected parties enact one of those described below, based on their environment. \n\n__Fix:__ Apply the patch [PATCH_net_1_4.patch](2019-001/PATCH_net_1_4.patch). Additionally, versions of the Linux kernel up to, and including, 4.14 require a second patch [PATCH_net_1a.patch](2019-001/PATCH_net_1a.patch). \n\n__Workaround #1:__ Block connections with a low MSS using one of the supplied [filters](2019-001/block-low-mss/README.md). (The values in the filters are examples. You can apply a higher or lower limit, as appropriate for your environment.) Note that these filters may break legitimate connections which rely on a low MSS. Also, note that this mitigation is only effective if TCP probing is disabled (that is, the `net.ipv4.tcp_mtu_probing` sysctl is set to 0, which appears to be the default value for that sysctl). \n\n__Workaround #2:__ Disable SACK processing (`/proc/sys/net/ipv4/tcp_sack` set to 0). \n\n(Note that either workaround should be sufficient on its own. It is not necessary to apply both workarounds.)\n\n\n### 2: [CVE-2019-11478](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11478): SACK Slowness (Linux \u003c 4.15) or Excess Resource Usage (all Linux versions)\n\n__Description:__ It is possible to send a crafted sequence of SACKs which will fragment the TCP retransmission queue. On Linux kernels prior to 4.15, an attacker may be able to further exploit the fragmented queue to cause an expensive linked-list walk for subsequent SACKs received for that same TCP connection. \n\n__Fix:__ Apply the patch [PATCH_net_2_4.patch](2019-001/PATCH_net_2_4.patch)\n\n__Workaround #1:__ Block connections with a low MSS using one of the supplied [filters](2019-001/block-low-mss/README.md). (The values in the filters are examples. You can apply a higher or lower limit, as appropriate for your environment.) Note that these filters may break legitimate connections which rely on a low MSS. Also, note that this mitigation is only effective if TCP probing is disabled (that is, the `net.ipv4.tcp_mtu_probing` sysctl is set to 0, which appears to be the default value for that sysctl). \n\n__Workaround #2:__ Disable SACK processing (`/proc/sys/net/ipv4/tcp_sack` set to 0). \n\n(Note that either workaround should be sufficient on its own. It is not necessary to apply both workarounds.)\n\n\n### 3: [CVE-2019-5599](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-5599): SACK Slowness (FreeBSD 12 using the RACK TCP Stack)\n\n__Description:__ It is possible to send a crafted sequence of SACKs which will fragment the RACK send map. An attacker may be able to further exploit the fragmented send map to cause an expensive linked-list walk for subsequent SACKs received for that same TCP connection. \n\n__Workaround #1:__ Apply the patch [split_limit.patch](2019-001/split_limit.patch) and set the `net.inet.tcp.rack.split_limit` sysctl to a reasonable value to limit the size of the SACK table. \n\n__Workaround #2:__ Temporarily disable the RACK TCP stack. \n\n(Note that either workaround should be sufficient on its own. It is not necessary to apply both workarounds.)\n\n\n### 4: [CVE-2019-11479](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11479): Excess Resource Consumption Due to Low MSS Values (all Linux versions)\n\n__Description:__ An attacker can force the Linux kernel to segment its responses into multiple TCP segments, each of which contains only 8 bytes of data. This drastically increases the bandwidth required to deliver the same amount of data. Further, it consumes additional resources (CPU and NIC processing power). This attack requires continued effort from the attacker and the impacts will end shortly after the attacker stops sending traffic. \n\n__Fix:__ Two patches [PATCH_net_3_4.patch](2019-001/PATCH_net_3_4.patch) and [PATCH_net_4_4.patch](2019-001/PATCH_net_4_4.patch) add a sysctl which enforces a minimum MSS, set by the `net.ipv4.tcp_min_snd_mss` sysctl. This lets an administrator enforce a minimum MSS appropriate for their applications. \n\n__Workaround:__ Block connections with a low MSS using one of the supplied [filters](2019-001/block-low-mss/README.md). (The values in the filters are examples. You can apply a higher or lower limit, as appropriate for your environment.) Note that these filters may break legitimate connections which rely on a low MSS. Also, note that this mitigation is only effective if TCP probing is disabled (that is, the `net.ipv4.tcp_mtu_probing` sysctl is set to 0, which appears to be the default value for that sysctl). \n\n\n### Note:\nGood system and application coding and configuration practices (limiting write buffers to the necessary level, monitoring connection memory consumption via SO_MEMINFO, and aggressively closing misbehaving connections) can help to limit the impact of attacks against these kinds of vulnerabilities. \n\n\n## Acknowledgments:\nOriginally reported by Jonathan Looney. \n\nWe thank Eric Dumazet for providing Linux fixes and support. \n\nWe thank Bruce Curtis for providing the Linux filters. \n\nWe thank Jonathan Lemon and Alexey Kodanev for helping to improve the Linux patches. \n\nWe gratefully acknowledge the assistance of Tyler Hicks in testing fixes, refining the information about vulnerable versions, and providing assistance during the disclosure process",
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cve-2019-11478

Vulnerability from cvelistv5

Published

2019-06-18 23:34

Modified

2024-09-16 23:45

Severity ?

5.3 (Medium) - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Summary

SACK can cause extensive memory use via fragmented resend queue

References

▼	URL	Tags
	https://www.kb.cert.org/vuls/id/905115	third-party-advisory, x_refsource_CERT-VN
	https://access.redhat.com/errata/RHSA-2019:1594	vendor-advisory, x_refsource_REDHAT
	https://access.redhat.com/errata/RHSA-2019:1602	vendor-advisory, x_refsource_REDHAT
	http://www.openwall.com/lists/oss-security/2019/06/28/2	mailing-list, x_refsource_MLIST
	http://www.openwall.com/lists/oss-security/2019/07/06/3	mailing-list, x_refsource_MLIST
	http://www.openwall.com/lists/oss-security/2019/07/06/4	mailing-list, x_refsource_MLIST
	https://access.redhat.com/errata/RHSA-2019:1699	vendor-advisory, x_refsource_REDHAT
	https://seclists.org/bugtraq/2019/Jul/30	mailing-list, x_refsource_BUGTRAQ
	http://www.openwall.com/lists/oss-security/2019/10/24/1	mailing-list, x_refsource_MLIST
	http://www.openwall.com/lists/oss-security/2019/10/29/3	mailing-list, x_refsource_MLIST
	https://www.oracle.com/security-alerts/cpujan2020.html	x_refsource_MISC
	https://www.oracle.com/security-alerts/cpuoct2020.html	x_refsource_MISC
	https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md	x_refsource_MISC
	https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SACKPanic	x_refsource_MISC
	https://access.redhat.com/security/vulnerabilities/tcpsack	x_refsource_MISC
	http://packetstormsecurity.com/files/153346/Kernel-Live-Patch-Security-Notice-LSN-0052-1.html	x_refsource_MISC
	https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44193	x_refsource_CONFIRM
	https://www.synology.com/security/advisory/Synology_SA_19_28	x_refsource_CONFIRM
	https://security.netapp.com/advisory/ntap-20190625-0001/	x_refsource_CONFIRM
	https://kc.mcafee.com/corporate/index?page=content&id=SB10287	x_refsource_CONFIRM
	http://www.vmware.com/security/advisories/VMSA-2019-0010.html	x_refsource_CONFIRM
	https://cert-portal.siemens.com/productcert/pdf/ssa-462066.pdf	x_refsource_CONFIRM
	https://www.us-cert.gov/ics/advisories/icsa-19-253-03	x_refsource_MISC
	http://packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.html	x_refsource_MISC
	http://www.arubanetworks.com/assets/alert/ARUBA-PSA-2020-010.txt	x_refsource_CONFIRM
	https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=f070ef2ac66716357066b683fb0baf55f8191a2e	x_refsource_MISC
	https://support.f5.com/csp/article/K26618426	x_refsource_CONFIRM
	https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2019-0007	x_refsource_CONFIRM
	http://packetstormsecurity.com/files/154408/Kernel-Live-Patch-Security-Notice-LSN-0055-1.html	x_refsource_MISC

Impacted products

▼	Vendor	Product
	Linux	Linux kernel

Show details on NVD website

JSON

To clipboard

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              "refsource": "MISC",
              "url": "http://packetstormsecurity.com/files/154408/Kernel-Live-Patch-Security-Notice-LSN-0055-1.html"
            }
          ]
        },
        "source": {
          "advisory": "https://usn.ubuntu.com/4017-1",
          "defect": [
            "https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1831638"
          ],
          "discovery": "UNKNOWN"
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc",
    "assignerShortName": "canonical",
    "cveId": "CVE-2019-11478",
    "datePublished": "2019-06-18T23:34:51.077803Z",
    "dateReserved": "2019-04-23T00:00:00",
    "dateUpdated": "2024-09-16T23:45:54.779Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Action not permitted

var-201906-1176

Vulnerability from variot

linux vulnerability

ID: NFLX-2019-001

Title: Linux and FreeBSD Kernel: Multiple TCP-based remote denial of service vulnerabilities

Release Date: 2019-06-17

Severity: Critical

Overview:

2: CVE-2019-11478: SACK Slowness (Linux < 4.15) or Excess Resource Usage (all Linux versions)

3: CVE-2019-5599: SACK Slowness (FreeBSD 12 using the RACK TCP Stack)

4: CVE-2019-11479: Excess Resource Consumption Due to Low MSS Values (all Linux versions)

Note:

Acknowledgments:

cve-2019-11478

Vulnerability from cvelistv5

Tags