An Expat security update has been released for Ubuntu Linux 14.04 ESM, 16.04 ESM, 18.04 LTS, 20.04 LTS, and 21.10.

USN-5288-1: Expat vulnerabilities

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Ubuntu Security Notice USN-5288-1
February 21, 2022

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

- Ubuntu 21.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in Expat.

Software Description:
- expat: XML parsing C library

Details:

It was discovered that Expat incorrectly handled certain 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 21.10:
libexpat1 2.4.1-2ubuntu0.1

Ubuntu 20.04 LTS:
libexpat1 2.2.9-1ubuntu0.2

Ubuntu 18.04 LTS:
libexpat1 2.2.5-3ubuntu0.4

Ubuntu 16.04 ESM:
lib64expat1 2.1.0-7ubuntu0.16.04.5+esm2
libexpat1 2.1.0-7ubuntu0.16.04.5+esm2

Ubuntu 14.04 ESM:
lib64expat1 2.1.0-4ubuntu1.4+esm4
libexpat1 2.1.0-4ubuntu1.4+esm4

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

References:
  https://ubuntu.com/security/notices/USN-5288-1
CVE-2021-45960, CVE-2021-46143, CVE-2022-22822, CVE-2022-22823,
CVE-2022-22824, CVE-2022-22825, CVE-2022-22826, CVE-2022-22827,
CVE-2022-23852, CVE-2022-23990, CVE-2022-25235, CVE-2022-25236

Package Information:
  https://launchpad.net/ubuntu/+source/expat/2.4.1-2ubuntu0.1
  https://launchpad.net/ubuntu/+source/expat/2.2.9-1ubuntu0.2
  https://launchpad.net/ubuntu/+source/expat/2.2.5-3ubuntu0.4