GHSA-G6WQ-QCWM-J5G2

Vulnerability from github – Published: 2020-06-05 14:21 – Updated: 2023-05-16 16:17
VLAI?
Summary
Regular Expression Denial of Service in websocket-extensions (RubyGem)
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.

Patches

Users should upgrade to version 0.1.5.

Workarounds

There are no known work-arounds other than disabling any public-facing WebSocket functionality you are operating.

References

  • https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions/
Severity ?
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "websocket-extensions"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2020-7663"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2020-06-03T23:10:34Z",
    "nvd_published_at": "2020-06-02T19:15:00Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nThe ReDoS flaw allows an attacker to exhaust the server\u0027s capacity to process incoming requests by sending a WebSocket handshake request containing a header of 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 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.\n\n### Patches\n\nUsers should upgrade to version 0.1.5.\n\n### Workarounds\n\nThere are no known work-arounds other than disabling any public-facing WebSocket functionality you are operating.\n\n### References\n\n- https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions/",
  "id": "GHSA-g6wq-qcwm-j5g2",
  "modified": "2023-05-16T16:17:54Z",
  "published": "2020-06-05T14:21:29Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/faye/websocket-extensions-ruby/security/advisories/GHSA-g6wq-qcwm-j5g2"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-7663"
    },
    {
      "type": "WEB",
      "url": "https://github.com/faye/websocket-extensions-ruby/commit/aa156a439da681361ed6f53f1a8131892418838b"
    },
    {
      "type": "WEB",
      "url": "https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/faye/websocket-extensions-ruby"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/websocket-extensions/CVE-2020-7663.yml"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2020/08/msg00031.html"
    },
    {
      "type": "WEB",
      "url": "https://snyk.io/vuln/SNYK-RUBY-WEBSOCKETEXTENSIONS-570830"
    },
    {
      "type": "WEB",
      "url": "https://usn.ubuntu.com/4502-1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Regular Expression Denial of Service in websocket-extensions (RubyGem)"
}


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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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