USN-4666-2: lxml vulnerability

Releases

• Ubuntu 20.10
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM
• Ubuntu 12.04

Packages

• lxml - pythonic binding for the libxml2 and libxslt librarie

Details

USN-4666-1 partially fixed a vulnerability in lxml, but an additional patch was needed. This update provides
the corresponding additional patch in order to properly fix the vulnerability.

Original advisory details:

It was discovered that lxml incorrectly handled certain HTML.
An attacker could possibly use this issue to 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 - 4.5.2-1ubuntu0.3

Ubuntu 20.04

• python-lxml - 4.5.0-1ubuntu0.2
• python3-lxml - 4.5.0-1ubuntu0.2

Ubuntu 18.04

• python-lxml - 4.2.1-1ubuntu0.3
• python3-lxml - 4.2.1-1ubuntu0.3

Ubuntu 16.04

• python-lxml - 3.5.0-1ubuntu0.3
• python3-lxml - 3.5.0-1ubuntu0.3

Ubuntu 14.04

• python-lxml - 3.3.3-1ubuntu0.2+esm2
  Available with Ubuntu Pro
• python3-lxml - 3.3.3-1ubuntu0.2+esm2
  Available with Ubuntu Pro

Ubuntu 12.04

• python-lxml - 2.3.2-1ubuntu0.5
• python3-lxml - 2.3.2-1ubuntu0.5

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

References

• CVE-2020-27783

Related notices

• USN-4666-1: python3-lxml, python-lxml, python-lxml-doc, lxml