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Ubuntu Security Notice USN-7035-1
September 25, 2024

apparmor vulnerability

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

• Ubuntu 22.04 LTS
• Ubuntu 20.04 LTS

Summary:

AppArmor restrictions could be bypassed for rules allowing mount
operations

Software Description:

• 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 LTS
apparmor 3.0.4-2ubuntu2.4

Ubuntu 20.04 LTS
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:
https://ubuntu.com/security/notices/USN-7035-1
https://bugs.launchpad.net/apparmor/+bug/1597017
CVE-2016-1585

Package Information:
https://launchpad.net/ubuntu/+source/apparmor/3.0.4-2ubuntu2.4
https://launchpad.net/ubuntu/+source/apparmor/2.13.3-7ubuntu5.4