Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS1odnd4LXFoMmgteGNmas4AAwSV

TYPO3 HTML Sanitizer vulnerable to Cross-Site Scripting

Problem

Due to a parsing issue in the upstream package masterminds/html5, malicious markup used in a sequence with special HTML CDATA sections cannot be filtered and sanitized. This allows bypassing the cross-site scripting mechanism of typo3/html-sanitizer.

Besides that, the upstream package masterminds/html5 provides HTML raw text elements (script, style, noframes, noembed and iframe) as DOMText nodes, which were not processed and sanitized further. None of the mentioned elements were defined in the default builder configuration, that's why only custom behaviors, using one of those tag names, were vulnerable to cross-site scripting.

Solution

Update to typo3/html-sanitizer versions 1.5.0 or 2.1.1 that fix the problem described.

Permalink: https://github.com/advisories/GHSA-hvwx-qh2h-xcfj
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1odnd4LXFoMmgteGNmas4AAwSV
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: 6 months ago
Updated: 4 months ago

CVSS Score: 6.1
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Identifiers: GHSA-hvwx-qh2h-xcfj, CVE-2022-23499
References:

• https://github.com/TYPO3/html-sanitizer/security/advisories/GHSA-hvwx-qh2h-xcfj
• https://github.com/TYPO3/html-sanitizer/pull/105
• https://github.com/TYPO3/html-sanitizer/pull/106
• https://github.com/TYPO3/html-sanitizer/releases/tag/v1.5.0
• https://github.com/TYPO3/html-sanitizer/releases/tag/v2.1.1
• https://github.com/FriendsOfPHP/security-advisories/blob/master/typo3/cms/CVE-2022-23499.yaml
• https://typo3.org/security/advisory/typo3-core-sa-2022-017
• https://nvd.nist.gov/vuln/detail/CVE-2022-23499
• https://github.com/advisories/GHSA-hvwx-qh2h-xcfj

Affected Packages