ghsa-g8ww-46x2-2p65
Vulnerability from github
Published
2021-05-05 19:48
Modified
2023-08-08 15:37
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
Denial of Service in Action Dispatch
Details

Impact

There is a possible Denial of Service vulnerability in Action Dispatch. Carefully crafted Accept headers can cause the mime type parser in Action Dispatch to do catastrophic backtracking in the regular expression engine.

Releases

The fixed releases are available at the normal locations.

Workarounds

The following monkey patch placed in an initializer can be used to work around the issue.

ruby module Mime class Type MIME_REGEXP = /\A(?:\*\/\*|#{MIME_NAME}\/(?:\*|#{MIME_NAME})(?>\s*#{MIME_PARAMETER}\s*)*)\z/ end end

Patches

To aid users who aren't able to upgrade immediately we have provided patches for the two supported release series. They are in git-am format and consist of a single changeset.

  • 6-0-Prevent-catastrophic-backtracking-during-mime-parsin.patch - Patch for 6.0 series
  • 6-1-Prevent-catastrophic-backtracking-during-mime-parsin.patch - Patch for 6.1 series

Please note that only the 6.1.Z, 6.0.Z, and 5.2.Z series are supported at present. Users of earlier unsupported releases are advised to upgrade as soon as possible as we cannot guarantee the continued availability of security fixes for unsupported releases.

Credits

Thanks to Security Curious security...@pm.me for reporting this!

Show details on source website

To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 6.0.3.6"
      },
      "package": {
        "ecosystem": "RubyGems",
        "name": "actionpack"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.0.0"
            },
            {
              "fixed": "6.0.3.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 6.1.3.1"
      },
      "package": {
        "ecosystem": "RubyGems",
        "name": "actionpack"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.1.0"
            },
            {
              "fixed": "6.1.3.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-22902"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-05-05T19:47:37Z",
    "nvd_published_at": "2021-06-11T16:15:00Z",
    "severity": "HIGH"
  },
  "details": "Impact\n------\nThere is a possible Denial of Service vulnerability in Action Dispatch. Carefully crafted Accept headers can cause the mime type parser in Action Dispatch to do catastrophic backtracking in the regular expression engine.\n\nReleases\n--------\nThe fixed releases are available at the normal locations.\n\nWorkarounds\n-----------\nThe following monkey patch placed in an initializer can be used to work around the issue.\n\n```ruby\nmodule Mime\n  class Type\n    MIME_REGEXP = /\\A(?:\\*\\/\\*|#{MIME_NAME}\\/(?:\\*|#{MIME_NAME})(?\u003e\\s*#{MIME_PARAMETER}\\s*)*)\\z/\n  end\nend\n```\n\nPatches\n-------\nTo aid users who aren\u0027t able to upgrade immediately we have provided patches for the two supported release series. They are in git-am format and consist of a single changeset.\n\n* 6-0-Prevent-catastrophic-backtracking-during-mime-parsin.patch - Patch for 6.0 series\n* 6-1-Prevent-catastrophic-backtracking-during-mime-parsin.patch - Patch for 6.1 series\n\nPlease note that only the 6.1.Z, 6.0.Z, and 5.2.Z series are supported at present. Users of earlier unsupported releases are advised to upgrade as soon as possible as we cannot guarantee the continued availability of security fixes for unsupported releases.\n\nCredits\n-------\n\nThanks to Security Curious \u003csecurity...@pm.me\u003e for reporting this!",
  "id": "GHSA-g8ww-46x2-2p65",
  "modified": "2023-08-08T15:37:20Z",
  "published": "2021-05-05T19:48:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-22902"
    },
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/1138654"
    },
    {
      "type": "WEB",
      "url": "https://discuss.rubyonrails.org/t/cve-2021-22902-possible-denial-of-service-vulnerability-in-action-dispatch/77866"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rails/rails/releases/tag/v6.0.3.7"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rails/rails/releases/tag/v6.1.3.2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2021-22902.yml"
    },
    {
      "type": "WEB",
      "url": "https://groups.google.com/g/rubyonrails-security/c/_5ID_ld9u1c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Denial of Service in Action Dispatch"
}


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