USN-7035-1: AppArmor vulnerability

Releases

• Ubuntu 22.04 LTS
• Ubuntu 20.04 LTS

Packages

• apparmor - Linux security system

Details

It was discovered that the AppArmor policy compiler incorrectly generated
looser restrictions than expected for rules allowing mount operations. A
local attacker could possibly use this to bypass AppArmor restrictions in
applications where some mount operations were permitted.

Update instructions

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

Ubuntu 22.04

• apparmor - 3.0.4-2ubuntu2.4

Ubuntu 20.04

• apparmor - 2.13.3-7ubuntu5.4

In general, a standard system update will make all the necessary changes.
After this update, applications confined by policies with mount operations
restrictions may need to have the rules updated.

References

• CVE-2016-1585
• https://bugs.launchpad.net/apparmor/+bug/1597017