A lxml security update has been released for Ubuntu Linux 16.04 LTS, 18.04 LTS, 20.04 LTS, and 20.10.
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Ubuntu Security Notice USN-4896-1
March 30, 2021
lxml vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
lxml could allow cross-site scripting (XSS) attacks.
Software Description:
- lxml: pythonic binding for the libxml2 and libxslt libraries
Details:
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.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 20.10:
python3-lxml 4.5.2-1ubuntu0.4
Ubuntu 20.04 LTS:
python-lxml 4.5.0-1ubuntu0.3
python3-lxml 4.5.0-1ubuntu0.3
Ubuntu 18.04 LTS:
python-lxml 4.2.1-1ubuntu0.4
python3-lxml 4.2.1-1ubuntu0.4
Ubuntu 16.04 LTS:
python-lxml 3.5.0-1ubuntu0.4
python3-lxml 3.5.0-1ubuntu0.4
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-4896-1
CVE-2021-28957
Package Information:
https://launchpad.net/ubuntu/+source/lxml/4.5.2-1ubuntu0.4
https://launchpad.net/ubuntu/+source/lxml/4.5.0-1ubuntu0.3
https://launchpad.net/ubuntu/+source/lxml/4.2.1-1ubuntu0.4
https://launchpad.net/ubuntu/+source/lxml/3.5.0-1ubuntu0.4
