ghsa-22f2-v57c-j9cx
Vulnerability from github
Published
2024-02-28 22:57
Modified
2024-06-10 18:30
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Summary
Rack vulnerable to ReDoS in content type parsing (2nd degree polynomial)
Details

Summary

ruby module Rack class MediaType SPLIT_PATTERN = %r{\s*[;,]\s*} The above regexp is subject to ReDos. 50K blank characters as a prefix to the header will take over 10s to split.

PoC

A simple HTTP request with lots of blank characters in the content-type header:

ruby request["Content-Type"] = (" " * 50_000) + "a,"

Impact

It's a very easy to craft ReDoS. Like all ReDoS the impact is debatable.

Show details on source website

To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "rack"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0"
            },
            {
              "fixed": "3.0.9.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "rack"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.4"
            },
            {
              "fixed": "2.2.8.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-25126"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1333"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-02-28T22:57:26Z",
    "nvd_published_at": "2024-02-29T00:15:51Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\n\n```ruby\nmodule Rack\n  class MediaType\n    SPLIT_PATTERN = %r{\\s*[;,]\\s*}\n```\nThe above regexp is subject to ReDos. 50K blank characters as a prefix to the header will take over 10s to split.\n\n### PoC\n\nA simple HTTP request with lots of blank characters in the content-type header:\n\n```ruby\nrequest[\"Content-Type\"] = (\" \" * 50_000) + \"a,\"\n```\n\n### Impact\n\nIt\u0027s a very easy to craft ReDoS. Like all ReDoS the impact is debatable.",
  "id": "GHSA-22f2-v57c-j9cx",
  "modified": "2024-06-10T18:30:52Z",
  "published": "2024-02-28T22:57:26Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/rack/rack/security/advisories/GHSA-22f2-v57c-j9cx"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-25126"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rack/rack/commit/6efb2ceea003c4b195815a614e00438cbd543462"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rack/rack/commit/d9c163a443b8cadf4711d84bd2c58cb9ef89cf49"
    },
    {
      "type": "WEB",
      "url": "https://discuss.rubyonrails.org/t/denial-of-service-vulnerability-in-rack-content-type-parsing/84941"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/rack/rack"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rack/CVE-2024-25126.yml"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/04/msg00022.html"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20240510-0005"
    }
  ],
  "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:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Rack vulnerable to ReDoS in content type parsing (2nd degree polynomial)"
}


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