python-html-sanitizer: CVE-2024-34078: Arbitrary HTML present after sanitization because of unicode normalization

Debian Bug report logs - #1070710
python-html-sanitizer: CVE-2024-34078: Arbitrary HTML present after sanitization because of unicode normalization

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: python-html-sanitizer: CVE-2024-34078: Arbitrary HTML present after sanitization because of unicode normalization

Date: Tue, 07 May 2024 19:06:21 +0200

Source: python-html-sanitizer
Version: 2.2-1
Severity: grave
Tags: security upstream
Justification: user security hole
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>

Hi,

The following vulnerability was published for python-html-sanitizer.

CVE-2024-34078[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2024-34078
    https://www.cve.org/CVERecord?id=CVE-2024-34078
[1] https://github.com/matthiask/html-sanitizer/security/advisories/GHSA-wvhx-q427-fgh4
[2] https://github.com/matthiask/html-sanitizer/commit/48db42fc5143d0140c32d929c46b802f96913550

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore

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