lxml: CVE-2021-43818: HTML Cleaner allows crafted and SVG embedded scripts to pass through

Debian Bug report logs - #1001885
lxml: CVE-2021-43818: HTML Cleaner allows crafted and SVG embedded scripts to pass through

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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: lxml: CVE-2021-43818: HTML Cleaner allows crafted and SVG embedded scripts to pass through

Date: Sat, 18 Dec 2021 11:42:55 +0100

Source: lxml
Version: 4.6.4-1
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>

Hi,

The following vulnerability was published for lxml.

CVE-2021-43818[0]:
| lxml is a library for processing XML and HTML in the Python language.
| Prior to version 4.6.5, the HTML Cleaner in lxml.html lets certain
| crafted script content pass through, as well as script content in SVG
| files embedded using data URIs. Users that employ the HTML cleaner in
| a security relevant context should upgrade to lxml 4.6.5 to receive a
| patch. There are no known workarounds available.


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-2021-43818
    https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43818
[1] https://github.com/lxml/lxml/security/advisories/GHSA-55x5-fj6c-h6m8

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore

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