PT-2021-22454 · Unknown · Remark-Html

Matthieusieben · Published 2021-09-07 · Updated 2021-09-14 · CVE-2021-39199

Positive Technologies (AI Summary)

CVSS v3.1

10

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Name of the Vulnerable Software and Affected Versions remark-html versions prior to 13.0.2 remark-html versions prior to 14.0.1

Description The documentation of remark-html mentioned that it was safe by default, but in practice, the default was never safe and had to be opted into. This means user input was not sanitized, allowing arbitrary HTML to be passed through, leading to potential XSS attacks.

Recommendations For versions prior to 13.0.2, update to version 13.0.2 or later. For versions prior to 14.0.1, update to version 14.0.1 or later. On older affected versions, pass sanitize: true to mitigate the issue, for example, by using .use(remarkHtml, {sanitize: true}).

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2021-39199

GHSA-9Q5W-79CV-947M

Affected Products

Remark-Html

References · 9

• https://github.com/remarkjs/remark-html/commit/b75c9dde582ad87ba498e369c033dc8a350478c1 · Patch
• https://github.com/remarkjs/remark-html/releases/tag/14.0.1 · Patch
• https://github.com/remarkjs/remark-html/security/advisories/GHSA-9q5w-79cv-947m · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-39199 · Security Note
• https://osv.dev/vulnerability/CVE-2021-39199 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-9q5w-79cv-947m · Vendor Advisory
• https://github.com/remarkjs/remark-html · Note
• https://npmjs.com/package/remark-html · Note
• https://t.me/cibsecurity/28382 · Telegram Post