GHSA-8MQ4-9JJH-9XRC

Vulnerability from github – Published: 2024-02-28 18:57 – Updated: 2025-02-14 18:35
VLAI?
Summary
YARD's default template vulnerable to Cross-site Scripting in generated frames.html
Details

Summary

The "frames.html" file within the Yard Doc's generated documentation is vulnerable to Cross-Site Scripting (XSS) attacks due to inadequate sanitization of user input within the JavaScript segment of the "frames.erb" template file.

Details

The vulnerability stems from mishandling user-controlled data retrieved from the URL hash in the embedded JavaScript code within the "frames.erb" template file. Specifically, the script lacks proper sanitization of the hash data before utilizing it to establish the top-level window's location. This oversight permits an attacker to inject malicious JavaScript payloads through carefully crafted URLs.

Snippet from "frames.erb": (v0.9.34)

<script type="text/javascript">
  var match = unescape(window.location.hash).match(/^#!(.+)/);
  var name = match ? match[1] : '<%= url_for_main %>';
  name = name.replace(/^(\w+):\/\//, '').replace(/^\/\//, '');
  window.top.location = name;
</script>

(v0.9.35)

<script type="text/javascript">
  var match = decodeURIComponent(window.location.hash).match(/^#!(.+)/);
  var name = match ? match[1] : '<%= url_for_main %>';
  name = name.replace(/^((\w*):)?[\/\\]*/gm, '').trim();
  window.top.location.replace(name)
</script>

PoC (Proof of Concept)

To exploit this vulnerability: 1. Gain access to the generated Yard Doc. 2. Locate and access the "frames.html" file. 3. Construct a URL containing the malicious payload in the hash segment, for instance: #!javascript:xss for v0.9.34, and #:javascript:xss for v0.9.35

Impact

This XSS vulnerability presents a substantial threat by enabling an attacker to execute arbitrary JavaScript code within the user's session context. Potential ramifications include session hijacking, theft of sensitive data, unauthorized access to user accounts, and defacement of websites. Any user visiting the compromised page is susceptible to exploitation. It is critical to promptly address this vulnerability to mitigate potential harm to users and preserve the application's integrity.

Severity ?
5.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "yard"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.9.36"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-27285"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2024-02-28T18:57:19Z",
    "nvd_published_at": "2024-02-28T20:15:41Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\nThe \"frames.html\" file within the Yard Doc\u0027s generated documentation is vulnerable to Cross-Site Scripting (XSS) attacks due to inadequate sanitization of user input within the JavaScript segment of the \"frames.erb\" template file.\n\n### Details\nThe vulnerability stems from mishandling user-controlled data retrieved from the URL hash in the embedded JavaScript code within the \"frames.erb\" template file. Specifically, the script lacks proper sanitization of the hash data before utilizing it to establish the top-level window\u0027s location. This oversight permits an attacker to inject malicious JavaScript payloads through carefully crafted URLs.\n\nSnippet from \"frames.erb\":\n(v0.9.34)\n```erb\n\u003cscript type=\"text/javascript\"\u003e\n  var match = unescape(window.location.hash).match(/^#!(.+)/);\n  var name = match ? match[1] : \u0027\u003c%= url_for_main %\u003e\u0027;\n  name = name.replace(/^(\\w+):\\/\\//, \u0027\u0027).replace(/^\\/\\//, \u0027\u0027);\n  window.top.location = name;\n\u003c/script\u003e\n```\n\n(v0.9.35)\n```erb\n\u003cscript type=\"text/javascript\"\u003e\n  var match = decodeURIComponent(window.location.hash).match(/^#!(.+)/);\n  var name = match ? match[1] : \u0027\u003c%= url_for_main %\u003e\u0027;\n  name = name.replace(/^((\\w*):)?[\\/\\\\]*/gm, \u0027\u0027).trim();\n  window.top.location.replace(name)\n\u003c/script\u003e\n```\n\n### PoC (Proof of Concept)\nTo exploit this vulnerability:\n1. Gain access to the generated Yard Doc.\n2. Locate and access the \"frames.html\" file.\n3. Construct a URL containing the malicious payload in the hash segment, for instance: `#!javascript:xss` for v0.9.34, and `#:javascript:xss` for v0.9.35\n\n### Impact\nThis XSS vulnerability presents a substantial threat by enabling an attacker to execute arbitrary JavaScript code within the user\u0027s session context. Potential ramifications include session hijacking, theft of sensitive data, unauthorized access to user accounts, and defacement of websites. Any user visiting the compromised page is susceptible to exploitation. It is critical to promptly address this vulnerability to mitigate potential harm to users and preserve the application\u0027s integrity.",
  "id": "GHSA-8mq4-9jjh-9xrc",
  "modified": "2025-02-14T18:35:42Z",
  "published": "2024-02-28T18:57:19Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/lsegal/yard/security/advisories/GHSA-8mq4-9jjh-9xrc"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-27285"
    },
    {
      "type": "WEB",
      "url": "https://github.com/lsegal/yard/pull/1538"
    },
    {
      "type": "WEB",
      "url": "https://github.com/lsegal/yard/commit/1fcb2d8b316caf8779cfdcf910715e9ab583f0aa"
    },
    {
      "type": "WEB",
      "url": "https://github.com/lsegal/yard/commit/2069e2bf08293bda2fcc78f7d0698af6354054be"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-8mq4-9jjh-9xrc"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/lsegal/yard"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/yard/CVE-2024-27285.yml"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/03/msg00006.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MR3Z2E2UIZZ7YOR7R645EVSBGWMB2RGA"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "YARD\u0027s default template vulnerable to Cross-site Scripting in generated frames.html"
}


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  • 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.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • 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.