CVE-2014-1424

What it actually does

The flaw permits bypass of AppArmor policy enforcement in apparmor_parser due to a miscompilation error, allowing unauthorized actions that should be restricted.

Why it matters to the business

Attackers can circumvent mandatory access controls on affected systems, increasing risk of unauthorized operations and potential compromise, especially in environments relying on AppArmor for isolation; the Jenkins-core package requires upgrade to 1.606.

How an attack unfolds

An attacker supplies crafted input to the vulnerable apparmor_parser that exploits the miscompilation, resulting in bypassed policy checks and execution of restricted operations.

How to fix it

Upgrade the apparmor package to version 2.8.95~2430-0ubuntu5.1 or later on Ubuntu 14.04 systems; for Jenkins deployments update org.jenkins-ci.main/jenkins-core to version 1.606.

How to confirm the fix worked

Verify the installed package version matches or exceeds the fixed release and test that AppArmor policies are enforced as expected after upgrade.

Typical attack path

1. Locate a system running the vulnerable apparmor package or affected Jenkins core version
2. Craft input vectors that trigger the miscompilation flaw
3. Submit the input to bypass intended AppArmor restrictions
4. Perform actions that violate the security policy

How to detect it

Review system and application logs for unexpected policy violations or successful operations that should have been blocked by AppArmor; examine audit trails for anomalous process behavior around the time of policy loading.

What your security team should do

• Apply the listed fixed versions immediately given the public disclosure date and potential for policy bypass
• Audit systems using AppArmor or the affected Jenkins package for correct policy application
• Monitor for any post-upgrade behavioral changes in confined applications