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.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2024-34078)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2024-34078)

The remote Debian 11 host has a package installed that is affected by a vulnerability as referenced in the dla-3856 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-3856-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                           Chris Lamb     August 26, 2024                               https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : python-html-sanitizer     Version        : 1.9.1-2+deb11u1     CVE ID         : CVE-2024-34078     Debian Bug     : 1070710

    It was discovered that there was a sanitisation bypass issue in     python-html-sanitizer, a library used ensure that user-specified     content cannot inject HTML or JavaScript into a webpage.

    If the default keep_typographic_whitespace=False value was set,     malicous users could have exploited the fact that some Unicode     characters normalise to chevrons, which allowed specially-crafted     HTML to escape sanitization.

    For Debian 11 bullseye, this problem has been fixed in version     1.9.1-2+deb11u1.

    We recommend that you upgrade your python-html-sanitizer packages.

    For the detailed security status of python-html-sanitizer please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/python-html-sanitizer

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Type	Severity
257540	Linux Distros Unpatched Vulnerability : CVE-2024-34078	Nessus	Misc.	Local	medium
420134	SCA: security update for html-sanitizer (GHSA-wvhx-q427-fgh3)	Tenable Cloud Security	SCA Checks	Local	medium
420134	SCA: security update for html-sanitizer (GHSA-wvhx-q427-fgh3)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium
206214	Debian dla-3856 : python3-html-sanitizer - security update	Nessus	Debian Local Security Checks	Local	medium

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