Ubuntu 20.10 USN-4720-1 Critical: Apport Escalation and DoS

ubuntu

February 2, 2021

Several security issues were fixed in Apport.

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)

Topics Covered

security advisory denial of service update critical privilege escalation DoS ubuntu escalation apport

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.