GHSA-p6h9-gw49-rqm4
Vulnerability from github
Published
2018-07-12 20:29
Modified
2024-09-30 17:00
Severity ?
6.1 (Medium) - CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.3 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Summary
markdown2 is vulnerable to cross-site scripting
Details

An issue was discovered in markdown2 (aka python-markdown2) through 2.3.5. The safe_mode feature, which is supposed to sanitize user input against XSS, is flawed and does not escape the input properly. With a crafted payload, XSS can be triggered, as demonstrated by omitting the final > character from an IMG tag.

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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "markdown2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.3.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2018-5773"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2020-06-16T21:48:21Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "An issue was discovered in `markdown2` (aka python-markdown2) through 2.3.5. The `safe_mode` feature, which is supposed to sanitize user input against XSS, is flawed and does not escape the input properly. With a crafted payload, XSS can be triggered, as demonstrated by omitting the final `\u003e` character from an IMG tag.",
  "id": "GHSA-p6h9-gw49-rqm4",
  "modified": "2024-09-30T17:00:47Z",
  "published": "2018-07-12T20:29:21Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-5773"
    },
    {
      "type": "WEB",
      "url": "https://github.com/google/osv/issues/430"
    },
    {
      "type": "WEB",
      "url": "https://github.com/trentm/python-markdown2/issues/285"
    },
    {
      "type": "WEB",
      "url": "https://github.com/trentm/python-markdown2/pull/303"
    },
    {
      "type": "WEB",
      "url": "https://github.com/trentm/python-markdown2/commit/1b1dcdd727c0ef03453b9f5ef5ae3679f1d72323"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-p6h9-gw49-rqm4"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/markdown2/PYSEC-2018-13.yaml"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/trentm/python-markdown2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/trentm/python-markdown2/blob/master/CHANGES.md#python-markdown2-236"
    }
  ],
  "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"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "markdown2 is vulnerable to cross-site scripting"
}


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