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Ubuntu Security Notice USN-4896-2

Ubuntu Security Notice USN-4896-2
Posted Apr 8, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4896-2 - USN-4896-1 fixed a vulnerability in lxml. This update provides the corresponding update for Ubuntu 14.04 ESM. It was discovered that lxml incorrectly handled certain HTML attributes. A remote attacker could possibly use this issue to perform cross-site scripting attacks. Various other issues were also addressed.

tags | advisory, remote, xss
systems | linux, ubuntu
advisories | CVE-2021-28957
MD5 | e4f2f008e2cdcc1460a0b818e3b91206

Ubuntu Security Notice USN-4896-2

Change Mirror Download
=========================================================================
Ubuntu Security Notice USN-4896-2
April 08, 2021

lxml vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 ESM

Summary:

lxml could allow cross-site scripting (XSS) attacks.

Software Description:
- lxml: pythonic binding for the libxml2 and libxslt libraries

Details:

USN-4896-1 fixed a vulnerability in lxml. This update provides
the corresponding update for Ubuntu 14.04 ESM.

Original advisory 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 14.04 ESM:
python-lxml 3.3.3-1ubuntu0.2+esm3
python3-lxml 3.3.3-1ubuntu0.2+esm3

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-4896-2
https://ubuntu.com/security/notices/USN-4896-1
CVE-2021-28957
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