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GHSA-VFVF-MQQ8-RWQC

Vulnerability from github – Published: 2019-02-18 23:58 – Updated: 2023-09-07 22:23
VLAI
Summary
Sanitization bypass using HTML Entities in marked
Details

Affected versions of marked are susceptible to a cross-site scripting vulnerability in link components when sanitize:true is configured.

Proof of Concept

This flaw exists because link URIs containing HTML entities get processed in an abnormal manner. Any HTML Entities get parsed on a best-effort basis and included in the resulting link, while if that parsing fails that character is omitted.

For example:

A link URI such as

javascript&#x58document;alert(1)

Renders a valid link that when clicked will execute alert(1).

Recommendation

Update to version 0.3.6 or later.

Severity
6.1 (Medium)
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "marked"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.3.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2016-10531"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2020-06-16T21:57:38Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "Affected versions of `marked` are susceptible to a cross-site scripting vulnerability in link components when `sanitize:true` is configured. \n\n## Proof of Concept\n\nThis flaw exists because link URIs containing HTML entities get processed in an abnormal manner. Any HTML Entities get parsed on a best-effort basis and included in the resulting link, while if that parsing fails that character is omitted.\n\nFor example:\n\nA link URI such as\n```\njavascript\u0026#x58document;alert\u0026#40;1\u0026#41;\n```\nRenders a valid link that when clicked will execute `alert(1)`.\n\n\n## Recommendation\n\nUpdate to version 0.3.6 or later.",
  "id": "GHSA-vfvf-mqq8-rwqc",
  "modified": "2023-09-07T22:23:29Z",
  "published": "2019-02-18T23:58:20Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2016-10531"
    },
    {
      "type": "WEB",
      "url": "https://github.com/chjj/marked/pull/592"
    },
    {
      "type": "WEB",
      "url": "https://github.com/chjj/marked/pull/592/commits/2cff85979be8e7a026a9aca35542c470cf5da523"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-vfvf-mqq8-rwqc"
    },
    {
      "type": "WEB",
      "url": "https://www.npmjs.com/advisories/101"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Sanitization bypass using HTML Entities in marked"
}



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