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AUSCERT External Security Bulletin Redistribution
USN-4896-1: lxml vulnerability
31 March 2021
AusCERT Security Bulletin Summary
Operating System: Ubuntu
Impact/Access: Cross-site Scripting -- Remote with User Interaction
CVE Names: CVE-2021-28957
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USN-4896-1: lxml vulnerability
30 March 2021
lxml could allow cross-site scripting (XSS) attacks.
o Ubuntu 20.10
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
o lxml - pythonic binding for the libxml2 and libxslt libraries
It was discovered that lxml incorrectly handled certain HTML attributes. A
remote attacker could possibly use this issue to perform cross-site
scripting (XSS) attacks.
The problem can be corrected by updating your system to the following package
o python3-lxml - 4.5.2-1ubuntu0.4
o python3-lxml - 4.5.0-1ubuntu0.3
o python-lxml - 4.5.0-1ubuntu0.3
o python3-lxml - 4.2.1-1ubuntu0.4
o python-lxml - 4.2.1-1ubuntu0.4
o python3-lxml - 3.5.0-1ubuntu0.4
o python-lxml - 3.5.0-1ubuntu0.4
In general, a standard system update will make all the necessary changes.
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