Vulnerability-Lookup

GHSA-4QW4-JPP4-8GVP

Vulnerability from github – Published: 2022-09-21 18:18 – Updated: 2022-09-21 18:18

Summary

Unbounded resource exhaustion in cmark-gfm autolink extension may lead to denial of service

Details

Impact

CommonMarker uses cmark-gfm for rendering Github Flavored Markdown. A polynomial time complexity issue in cmark-gfm's autolink extension may lead to unbounded resource exhaustion and subsequent denial of service.

Patches

This vulnerability has been patched in the following CommonMarker release:

v0.23.6

Workarounds

Disable use of the autolink extension.

References

https://github.com/gjtorikian/commonmarker/pull/190 https://github.com/github/cmark-gfm/security/advisories/GHSA-cgh3-p57x-9q7q https://en.wikipedia.org/wiki/Time_complexity

For more information

If you have any questions or comments about this advisory: * Open an issue in github/cmark-gfm

Acknowledgements

We would like to thank Legit Security for reporting this vulnerability.

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{
  "affected": [
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "commonmarker"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.23.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2022-09-21T18:18:05Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Impact\n\nCommonMarker uses `cmark-gfm` for rendering [Github Flavored Markdown](https://github.github.com/gfm/). A polynomial time complexity issue in cmark-gfm\u0027s autolink extension may lead to unbounded resource exhaustion and subsequent denial of service.\n\n### Patches\n\nThis vulnerability has been patched in the following CommonMarker release:\n\n- v0.23.6\n\n### Workarounds\n\nDisable use of the autolink extension.\n\n### References\n\nhttps://github.com/gjtorikian/commonmarker/pull/190\nhttps://github.com/github/cmark-gfm/security/advisories/GHSA-cgh3-p57x-9q7q\nhttps://en.wikipedia.org/wiki/Time_complexity\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [github/cmark-gfm](https://github.com/github/cmark-gfm)\n\n### Acknowledgements\n\nWe would like to thank [Legit Security](https://www.legitsecurity.com) for reporting this vulnerability.\n",
  "id": "GHSA-4qw4-jpp4-8gvp",
  "modified": "2022-09-21T18:18:05Z",
  "published": "2022-09-21T18:18:05Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/gjtorikian/commonmarker/security/advisories/GHSA-4qw4-jpp4-8gvp"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gjtorikian/commonmarker/pull/190"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/gjtorikian/commonmarker"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gjtorikian/commonmarker/releases/tag/v0.23.6"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [],
  "summary": "Unbounded resource exhaustion in cmark-gfm autolink extension may lead to denial of service"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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