github - ghsa-g78m-2chm-r7qv

ghsa-g78m-2chm-r7qv

Vulnerability from github

Published

2020-06-05 16:16

Modified

2021-08-25 21:51

Severity ?

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

Summary

Regular Expression Denial of Service in websocket-extensions (NPM package)

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 0.1.4.

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/

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "websocket-extensions"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2020-7662"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2020-06-03T23:10:26Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "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### Patches\n\nUsers should upgrade to version 0.1.4.\n\n### Workarounds\n\nThere are no known work-arounds other than disabling any public-facing\nWebSocket functionality you are operating.\n\n### References\n\n- https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions/",
  "id": "GHSA-g78m-2chm-r7qv",
  "modified": "2021-08-25T21:51:05Z",
  "published": "2020-06-05T16:16:12Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/faye/websocket-extensions-node/security/advisories/GHSA-g78m-2chm-r7qv"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-7662"
    },
    {
      "type": "WEB",
      "url": "https://github.com/faye/websocket-extensions-node/commit/29496f6838bfadfe5a2f85dff33ed0ba33873237"
    },
    {
      "type": "WEB",
      "url": "https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/faye/websocket-extensions-node"
    },
    {
      "type": "WEB",
      "url": "https://snyk.io/vuln/SNYK-JS-WEBSOCKETEXTENSIONS-570623"
    }
  ],
  "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 (NPM package)"
}

cve-2020-7662

Vulnerability from cvelistv5

Published

2020-06-02 18:28

Modified

2024-08-04 09:33

Severity ?

Summary

websocket-extensions npm module prior to 0.1.4 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.

References

▼	URL	Tags
	https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions	x_refsource_MISC
	https://github.com/faye/websocket-extensions-node/security/advisories/GHSA-g78m-2chm-r7qv	x_refsource_MISC
	https://github.com/faye/websocket-extensions-node/commit/29496f6838bfadfe5a2f85dff33ed0ba33873237	x_refsource_MISC
	https://snyk.io/vuln/SNYK-JS-WEBSOCKETEXTENSIONS-570623	x_refsource_MISC

Impacted products

Vendor

Product

Version

▼

n/a

websocket-extensions (npm)

Version: All versions prior to 0.1.4

Show details on NVD website

JSON

To clipboard

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            "url": "https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions"
          },
          {
            "tags": [
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            "url": "https://github.com/faye/websocket-extensions-node/security/advisories/GHSA-g78m-2chm-r7qv"
          },
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            "url": "https://snyk.io/vuln/SNYK-JS-WEBSOCKETEXTENSIONS-570623"
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}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

Action not permitted

ghsa-g78m-2chm-r7qv

Vulnerability from github

Impact

Patches

Workarounds

References

cve-2020-7662

Vulnerability from cvelistv5

Tags

Sightings

Nomenclature