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AUSCERT External Security Bulletin Redistribution
ESB-2021.3718
python-lxml security update
10 November 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: python-lxml
Publisher: Red Hat
Operating System: Red Hat
Impact/Access: Cross-site Scripting -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2021-28957
Reference: ESB-2021.2904
ESB-2021.1192
ESB-2021.1099
ESB-2021.1081
Original Bulletin:
https://access.redhat.com/errata/RHSA-2021:4158
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Red Hat Security Advisory
Synopsis: Moderate: python-lxml security update
Advisory ID: RHSA-2021:4158-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:4158
Issue date: 2021-11-09
CVE Names: CVE-2021-28957
=====================================================================
1. Summary:
An update for python-lxml is now available for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.
2. Relevant releases/architectures:
Red Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64
3. Description:
lxml is an XML processing library providing access to libxml2 and libxslt
libraries using the Python ElementTree API.
Security Fix(es):
* python-lxml: Missing input sanitization for formaction HTML5 attributes
may lead to XSS (CVE-2021-28957)
For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page(s) listed in the References section.
Additional Changes:
For detailed information on changes in this release, see the Red Hat
Enterprise Linux 8.5 Release Notes linked from the References section.
4. Solution:
For details on how to apply this update, which includes the changes
described in this advisory, refer to:
https://access.redhat.com/articles/11258
5. Bugs fixed (https://bugzilla.redhat.com/):
1941534 - CVE-2021-28957 python-lxml: Missing input sanitization for formaction HTML5 attributes may lead to XSS
6. Package List:
Red Hat Enterprise Linux AppStream (v. 8):
Source:
python-lxml-4.2.3-3.el8.src.rpm
aarch64:
python-lxml-debugsource-4.2.3-3.el8.aarch64.rpm
python3-lxml-4.2.3-3.el8.aarch64.rpm
python3-lxml-debuginfo-4.2.3-3.el8.aarch64.rpm
ppc64le:
python-lxml-debugsource-4.2.3-3.el8.ppc64le.rpm
python3-lxml-4.2.3-3.el8.ppc64le.rpm
python3-lxml-debuginfo-4.2.3-3.el8.ppc64le.rpm
s390x:
python-lxml-debugsource-4.2.3-3.el8.s390x.rpm
python3-lxml-4.2.3-3.el8.s390x.rpm
python3-lxml-debuginfo-4.2.3-3.el8.s390x.rpm
x86_64:
python-lxml-debugsource-4.2.3-3.el8.x86_64.rpm
python3-lxml-4.2.3-3.el8.x86_64.rpm
python3-lxml-debuginfo-4.2.3-3.el8.x86_64.rpm
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/
7. References:
https://access.redhat.com/security/cve/CVE-2021-28957
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.5_release_notes/
8. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2021 Red Hat, Inc.
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