Cross-Site Scripting Protection bypass in HTML Sanitizer
CVE-2022-23499

6.1MEDIUM

Key Information:

Vendor

Typo3

Status
Html-sanitizer
Vendor
CVE Published:
13 December 2022

What is CVE-2022-23499?

HTML sanitizer is written in PHP, aiming to provide XSS-safe markup based on explicitly allowed tags, attributes and values. In versions prior to 1.5.0 or 2.1.1, malicious markup used in a sequence with special HTML CDATA sections cannot be filtered and sanitized due to a parsing issue in the upstream package masterminds/html5. This allows bypassing the cross-site scripting mechanism of typo3/html-sanitizer. 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. This issue has been fixed in versions 1.5.0 and 2.1.1.

Affected Version(s)

html-sanitizer >= 1.0.0, < 1.5.0 < 1.0.0, 1.5.0

html-sanitizer >= 2.0.0, < 2.1.1 < 2.0.0, 2.1.1

References

https://github.com/TYPO3/html-sanitizer/security/advisori...
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CVSS V3.1

Score:
6.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.