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Red Hat Enterprise Linux 8 RHSA-2021-4158 Moderate: XSS in Python-Lxml

red hat
Calendar Grey November 9, 2021
Dist Redhat Esm H88
An enhancement for python-lxml in Red Hat Enterprise Linux 8 resolves a moderate severity vulnerability. Discover additional details here.
An update for python-lxml is now available for Red Hat Enterprise Linux 8

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

Summary

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.

Topics%20covered

Topics Covered

security advisory security update XSS Red Hat Enterprise Linux moderate severity input sanitization python-lxml

References

https://access.redhat.com/security/cve/CVE-2021-28957 https://access.redhat.com/security/updates/classification#moderate https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/8/html/8.5_release_notes/index

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


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

Topic

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 impactof Moderate. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory security update XSS Red Hat Enterprise Linux moderate severity input sanitization python-lxml

Relevant Releases Architectures

Red Hat Enterprise Linux AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64

Bugs Fixed

1941534 - CVE-2021-28957 python-lxml: Missing input sanitization for formaction HTML5 attributes may lead to XSS

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