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AUSCERT External Security Bulletin Redistribution
ESB-2021.1308
python-bleach security update
19 April 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: python-bleach
Publisher: Debian
Operating System: Debian GNU/Linux
Impact/Access: Cross-site Scripting -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2021-23980
Reference: ESB-2021.1157
Original Bulletin:
http://www.debian.org/security/2021/dsa-4892
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Debian Security Advisory DSA-4892-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
April 18, 2021 https://www.debian.org/security/faq
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Package : python-bleach
CVE ID : CVE-2021-23980
Debian Bug : 986251
It was reported that python-bleach, a whitelist-based HTML-sanitizing
library, is prone to a mutation XSS vulnerability in bleach.clean when
'svg' or 'math' are in the allowed tags, 'p' or 'br' are in allowed
tags, 'style', 'title', 'noscript', 'script', 'textarea', 'noframes',
'iframe', or 'xmp' are in allowed tags and 'strip_comments=False' is
set.
For the stable distribution (buster), this problem has been fixed in
version 3.1.2-0+deb10u2.
We recommend that you upgrade your python-bleach packages.
For the detailed security status of python-bleach please refer to its
security tracker page at:
https://security-tracker.debian.org/tracker/python-bleach
Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/
Mailing list: debian-security-announce@lists.debian.org
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