gsd-2020-7663
Vulnerability from gsd
Modified
2020-06-05 00:00
Details
### Impact The ReDoS flaw allows an attacker to exhaust the server's capacity to process incoming requests by sending a WebSocket handshake request containing a header of the following form: Sec-WebSocket-Extensions: a; b="\c\c\c\c\c\c\c\c\c\c ... That is, a header containing an unclosed string parameter value whose content is a repeating two-byte sequence of a backslash and some other character. The parser takes exponential time to reject this header as invalid, and this will block the processing of any other work on the same thread. Thus if you are running a single-threaded server, such a request can render your service completely unavailable. ### Workarounds There are no known work-arounds other than disabling any public-facing WebSocket functionality you are operating.
Aliases
Aliases
CVE-2020-7663


To clipboard 

{
  "GSD": {
    "alias": "CVE-2020-7663",
    "description": "websocket-extensions ruby module prior to 0.1.5 allows Denial of Service (DoS) via Regex Backtracking. The extension parser may take quadratic time when parsing a header containing an unclosed string parameter value whose content is a repeating two-byte sequence of a backslash and some other character. This could be abused by an attacker to conduct Regex Denial Of Service (ReDoS) on a single-threaded server by providing a malicious payload with the Sec-WebSocket-Extensions header.",
    "id": "GSD-2020-7663",
    "references": [
      "https://www.suse.com/security/cve/CVE-2020-7663.html",
      "https://access.redhat.com/errata/RHSA-2020:4366",
      "https://ubuntu.com/security/CVE-2020-7663"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "affected": [
        {
          "package": {
            "ecosystem": "RubyGems",
            "name": "websocket-extensions",
            "purl": "pkg:gem/websocket-extensions"
          }
        }
      ],
      "aliases": [
        "CVE-2020-7663",
        "GHSA-g6wq-qcwm-j5g2"
      ],
      "details": "### Impact\n\nThe ReDoS flaw allows an attacker to exhaust the server\u0027s capacity to process\nincoming requests by sending a WebSocket handshake request containing a header\nof the following form:\n\n    Sec-WebSocket-Extensions: a; b=\"\\c\\c\\c\\c\\c\\c\\c\\c\\c\\c ...\n\nThat is, a header containing an unclosed string parameter value whose content is\na repeating two-byte sequence of a backslash and some other character. The\nparser takes exponential time to reject this header as invalid, and this will\nblock the processing of any other work on the same thread. Thus if you are\nrunning a single-threaded server, such a request can render your service\ncompletely unavailable.\n\n### Workarounds\n\nThere are no known work-arounds other than disabling any public-facing WebSocket functionality you are operating.",
      "id": "GSD-2020-7663",
      "modified": "2020-06-05T00:00:00.000Z",
      "published": "2020-06-05T00:00:00.000Z",
      "references": [
        {
          "type": "WEB",
          "url": "https://github.com/faye/websocket-extensions-ruby/security/advisories/GHSA-g6wq-qcwm-j5g2"
        },
        {
          "type": "WEB",
          "url": "https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions/"
        }
      ],
      "schema_version": "1.4.0",
      "severity": [
        {
          "score": 7.5,
          "type": "CVSS_V3"
        }
      ],
      "summary": "Regular Expression Denial of Service in websocket-extensions (RubyGem)"
    }
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      "description": "### Impact\n\nThe ReDoS flaw allows an attacker to exhaust the server\u0027s capacity to process\nincoming requests by sending a WebSocket handshake request containing a header\nof the following form:\n\n    Sec-WebSocket-Extensions: a; b=\"\\c\\c\\c\\c\\c\\c\\c\\c\\c\\c ...\n\nThat is, a header containing an unclosed string parameter value whose content is\na repeating two-byte sequence of a backslash and some other character. The\nparser takes exponential time to reject this header as invalid, and this will\nblock the processing of any other work on the same thread. Thus if you are\nrunning a single-threaded server, such a request can render your service\ncompletely unavailable.\n\n### Workarounds\n\nThere are no known work-arounds other than disabling any public-facing WebSocket functionality you are operating.",
      "gem": "websocket-extensions",
      "ghsa": "g6wq-qcwm-j5g2",
      "patched_versions": [
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      "related": {
        "url": [
          "https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions/"
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      "title": "Regular Expression Denial of Service in websocket-extensions (RubyGem)",
      "url": "https://github.com/faye/websocket-extensions-ruby/security/advisories/GHSA-g6wq-qcwm-j5g2"
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          "cwe_ids": [
            "CWE-1035",
            "CWE-937"
          ],
          "date": "2020-09-17",
          "description": "websocket-extensions ruby module allows Denial of Service (DoS) via Regex Backtracking. The extension parser may take quadratic time when parsing a header containing an unclosed string parameter value whose content is a repeating two-byte sequence of a backslash and some other character. This could be abused by an attacker to conduct Regex Denial Of Service (ReDoS) on a single-threaded server by providing a malicious payload with the `Sec-WebSocket-Extensions` header.",
          "fixed_versions": [
            "0.1.5"
          ],
          "identifier": "CVE-2020-7663",
          "identifiers": [
            "CVE-2020-7663",
            "GHSA-g6wq-qcwm-j5g2"
          ],
          "not_impacted": "All versions starting from 0.1.5",
          "package_slug": "gem/websocket-extensions",
          "pubdate": "2020-06-02",
          "solution": "Upgrade to version 0.1.5 or above.",
          "title": "Uncontrolled Resource Consumption",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2020-7663"
          ],
          "uuid": "cfd3a6ba-c9fa-49a4-ab69-1357c45a77f3"
        }
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          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 5.0,
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
            "version": "2.0"
          },
          "exploitabilityScore": 10.0,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2023-01-20T18:22Z",
      "publishedDate": "2020-06-02T19:15Z"
    }
  }
}


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