An Apport security update has been released for Ubuntu Linux 18.04 LTS, 20.04 LTS, 21.04, and 21.10.

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Ubuntu Security Notice USN-5122-1
October 25, 2021

apport vulnerability
==========================================================================

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

- Ubuntu 21.10
- Ubuntu 21.04
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Apport could be made to create files as the administrator.

Software Description:
- apport: automatically generate crash reports for debugging

Details:

It was discovered that Apport could be tricked into writing core files as
root into arbitrary directories in certain scenarios. A local attacker
could possibly use this issue to escalate privileges. This update will
cause Apport to generate all core files in the /var/lib/apport/coredump
directory.

Update instructions:

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

Ubuntu 21.10:
apport 2.20.11-0ubuntu71
python3-apport 2.20.11-0ubuntu71

Ubuntu 21.04:
apport 2.20.11-0ubuntu65.4
python3-apport 2.20.11-0ubuntu65.4

Ubuntu 20.04 LTS:
apport 2.20.11-0ubuntu27.21
python3-apport 2.20.11-0ubuntu27.21

Ubuntu 18.04 LTS:
apport 2.20.9-0ubuntu7.27
python3-apport 2.20.9-0ubuntu7.27

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

References:
  https://ubuntu.com/security/notices/USN-5122-1
  https://launchpad.net/bugs/1948657

Package Information:
  https://launchpad.net/ubuntu/+source/apport/2.20.11-0ubuntu71
  https://launchpad.net/ubuntu/+source/apport/2.20.11-0ubuntu65.4
  https://launchpad.net/ubuntu/+source/apport/2.20.11-0ubuntu27.21
  https://launchpad.net/ubuntu/+source/apport/2.20.9-0ubuntu7.27