CVE-2024-34078

html-sanitizer allows arbitrary HTML present after sanitization because of unicode normalization

Published: May 6, 2024Updated: Nov 21, 2024 Sources: CVE List NVD GHSACWE-79

6.1MEDIUM

Description

html-sanitizer is an allowlist-based HTML cleaner. If using `keep_typographic_whitespace=False` (which is the default), the sanitizer normalizes unicode to the NFKC form at the end. Some unicode characters normalize to chevrons; this allows specially crafted HTML to escape sanitization. The problem has been fixed in 2.4.2.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:RUser Interaction

Required

Scope

S:CScope

Changed

Impact

C:LConfidentiality

Low

I:LIntegrity

Low

A:NAvailability

None

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Weaknesses

CWE-79

Affected Products

package-ecosystem

individual-devaka matthias k

html-sanitizerLibrary

OSS Libraries / web-framework

Exploitability

Official Patch Available

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Execution

Initial Access

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References

https://github.com/matthiask/html-sanitizer/commit/48db42fc5143d0140c32d929c46b802f96913550

github.com

https://github.com/matthiask/html-sanitizer/security/advisories/GHSA-wvhx-q427-fgh3

github.com

https://lists.debian.org/debian-lts-announce/2024/08/msg00000.html

lists.debian.org

and 1 more references View all →

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