Ubuntu Security Notice USN-4720-1

==========================================================================
Ubuntu Security Notice USN-4720-1
February 02, 2021

apport vulnerabilities
==========================================================================

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

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in Apport.

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

Details:

Itai Greenhut discovered that Apport incorrectly parsed certain files in
the /proc filesystem. A local attacker could use this issue to escalate
privileges and run arbitrary code. (CVE-2021-25682, CVE-2021-25683)

Itai Greenhut discovered that Apport incorrectly handled opening certain
special files. A local attacker could possibly use this issue to cause
Apport to hang, resulting in a denial of service. (CVE-2021-25684)

Update instructions:

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

Ubuntu 20.10:
  apport                          2.20.11-0ubuntu50.5
  python3-apport                  2.20.11-0ubuntu50.5

Ubuntu 20.04 LTS:
  apport                          2.20.11-0ubuntu27.16
  python3-apport                  2.20.11-0ubuntu27.16

Ubuntu 18.04 LTS:
  apport                          2.20.9-0ubuntu7.23
  python-apport                   2.20.9-0ubuntu7.23
  python3-apport                  2.20.9-0ubuntu7.23

Ubuntu 16.04 LTS:
  apport                          2.20.1-0ubuntu2.30
  python-apport                   2.20.1-0ubuntu2.30
  python3-apport                  2.20.1-0ubuntu2.30

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

References:
  https://usn.ubuntu.com/4720-1
  CVE-2021-25682, CVE-2021-25683, CVE-2021-25684

Package Information:
  https://launchpad.net/ubuntu/+source/apport/2.20.11-0ubuntu50.5
  https://launchpad.net/ubuntu/+source/apport/2.20.11-0ubuntu27.16
  https://launchpad.net/ubuntu/+source/apport/2.20.9-0ubuntu7.23
  https://launchpad.net/ubuntu/+source/apport/2.20.1-0ubuntu2.30