==========================================================================
Ubuntu Security Notice USN-5638-3
November 23, 2022

expat vulnerability
==========================================================================

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

- Ubuntu 22.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM

Summary:

Expat could be made to crash or execute arbitrary code.

Software Description:
- expat: XML parsing C library

Details:

USN-5638-1 fixed a vulnerability in Expat. This update provides
the corresponding updates for Ubuntu 16.04 ESM, Ubuntu 18.04 LTS,
Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 22.10. (CVE-2022-43680)
This update also fixes a minor regression introduced in
Ubuntu 18.04 LTS.

We apologize for the inconvenience.

Original advisory details:

  Rhodri James discovered that Expat incorrectly handled memory when
  processing certain malformed XML files. An attacker could possibly
  use this issue to cause a crash or execute arbitrary code.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 22.10:
   expat                           2.4.8-2ubuntu0.22.10.1
   libexpat1                       2.4.8-2ubuntu0.22.10.1

Ubuntu 22.04 LTS:
   expat                           2.4.7-1ubuntu0.2
   libexpat1                       2.4.7-1ubuntu0.2

Ubuntu 20.04 LTS:
   expat                           2.2.9-1ubuntu0.6
   libexpat1                       2.2.9-1ubuntu0.6

Ubuntu 18.04 LTS:
   expat                           2.2.5-3ubuntu0.9
   libexpat1                       2.2.5-3ubuntu0.9

Ubuntu 16.04 ESM:
   expat                           2.1.0-7ubuntu0.16.04.5+esm7
   lib64expat1                     2.1.0-7ubuntu0.16.04.5+esm7
   libexpat1                       2.1.0-7ubuntu0.16.04.5+esm7

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

References:
   https://ubuntu.com/security/notices/USN-5638-3
   https://ubuntu.com/security/notices/USN-5638-1
   CVE-2022-43680

Package Information:
https://launchpad.net/ubuntu/+source/expat/2.4.8-2ubuntu0.22.10.1
   https://launchpad.net/ubuntu/+source/expat/2.4.7-1ubuntu0.2
   https://launchpad.net/ubuntu/+source/expat/2.2.9-1ubuntu0.6
   https://launchpad.net/ubuntu/+source/expat/2.2.5-3ubuntu0.9