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