GHSA-9Q5W-79CV-947M

Vulnerability from github – Published: 2021-09-07 23:10 – Updated: 2021-09-07 19:05
VLAI?
Summary
Unsafe defaults in `remark-html`
Details

Impact

The documentation of remark-html has mentioned that it was safe by default. In practise the default was never safe and had to be opted into. This means arbitrary HTML can be passed through leading to potential XSS attacks.

Patches

The problem has been patched in 13.0.2 and 14.0.1: remark-html is now safe by default, and the implementation matches the documentation.

Workarounds

On older affected versions, pass sanitize: true, like so:

-  .use(remarkHtml)
+  .use(remarkHtml, {sanitize: true})

References

n/a

For more information

If you have any questions or comments about this advisory: * Open an issue in remark-html * Email us at security@unifiedjs.com

Severity ?
10.0 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
Show details on source website
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "remark-html"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "13.0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "npm",
        "name": "remark-html"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "14.0.0"
            },
            {
              "fixed": "14.0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "14.0.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2021-39199"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-09-07T19:05:40Z",
    "nvd_published_at": "2021-09-07T19:15:00Z",
    "severity": "CRITICAL"
  },
  "details": "### Impact\n\nThe documentation of `remark-html` has mentioned that it was safe by default. In practise the default was never safe and had to be opted into. This means arbitrary HTML can be passed through leading to potential XSS attacks.\n\n### Patches\n\nThe problem has been patched in 13.0.2 and 14.0.1: `remark-html` is now safe by default, and the implementation matches the documentation.\n\n### Workarounds\n\nOn older affected versions, pass `sanitize: true`, like so:\n\n```diff\n-  .use(remarkHtml)\n+  .use(remarkHtml, {sanitize: true})\n```\n\n### References\n\nn/a\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n* Open an issue in [`remark-html`](https://github.com/remarkjs/remark-html)\n* Email us at [security@unifiedjs.com](mailto:security@unifiedjs.com)\n",
  "id": "GHSA-9q5w-79cv-947m",
  "modified": "2021-09-07T19:05:40Z",
  "published": "2021-09-07T23:10:56Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/remarkjs/remark-html/security/advisories/GHSA-9q5w-79cv-947m"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-39199"
    },
    {
      "type": "WEB",
      "url": "https://github.com/remarkjs/remark-html/commit/b75c9dde582ad87ba498e369c033dc8a350478c1"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/remarkjs/remark-html"
    },
    {
      "type": "WEB",
      "url": "https://github.com/remarkjs/remark-html/releases/tag/14.0.1"
    },
    {
      "type": "WEB",
      "url": "https://www.npmjs.com/package/remark-html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Unsafe defaults in `remark-html`"
}


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  • 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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  • 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.



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