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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
NVD MITRE
6.1CVSSMEDIUM
EPSS Score
0.6%
Top 58.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:CC:LI:LA:N
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
Open in CVSS calculator →

Weaknesses

CWE-79

Affected Products

html-sanitizerPyPIOSS Libraries
html-sanitizermatthiask
Library
OSS Libraries / web-framework
pypipackage-ecosystemOSS Libraries
matthiaskindividual-devOSS Librariesaka matthias k

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

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 →

Timeline

Published
May 6, 2024
Last Updated
Nov 21, 2024

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