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Ubuntu Security Notice USN-4896-1

Ubuntu Security Notice USN-4896-1
Posted Mar 31, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4896-1 - It was discovered that lxml incorrectly handled certain HTML attributes. A remote attacker could possibly use this issue to perform cross-site scripting attacks.

tags | advisory, remote, xss
systems | linux, ubuntu
advisories | CVE-2021-28957
SHA-256 | 93f52472d7a4524528bf2ff0ab669aad6e78f49528a1b838c29d43bc6b763650

Ubuntu Security Notice USN-4896-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4896-1
March 30, 2021

lxml vulnerability
==========================================================================

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
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