GHSA-59jf-3q9v-rh6g: By-passing Cross-Site Scripting Protection in HTML Sanitizer

1. GitHub Advisory Database
2. GitHub Reviewed
3. CVE-2023-38500

By-passing Cross-Site Scripting Protection in HTML Sanitizer

Moderate severity GitHub Reviewed Published Jul 25, 2023 in TYPO3/html-sanitizer • Updated Jul 25, 2023

Package

composer typo3/html-sanitizer (Composer)

Affected versions

>= 1.0.0, < 1.5.1

>= 2.0.0, < 2.1.2

Patched versions

1.5.1

2.1.2

CVSS: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC:C (4.4)

Problem

Due to an encoding issue in the serialization layer, malicious markup nested in a noscript element was not encoded correctly. noscript is disabled in the default configuration, but might have been enabled in custom scenarios. This allows bypassing the cross-site scripting mechanism of typo3/html-sanitizer.

Solution

Update to typo3/html-sanitizer versions 1.5.1 or 2.1.2 that fix the problem described.

Credits

Thanks to David Klein and Yaniv Nizry who reported this issue, and to TYPO3 security team members Oliver Hader and Benjamin Franzke who fixed the issue.

References

• TYPO3-CORE-SA-2023-002

References

• GHSA-59jf-3q9v-rh6g

Published to the GitHub Advisory Database

Jul 25, 2023

Last updated

Jul 25, 2023