CVE-2022-20485

What it actually does

Resource exhaustion in NotificationChannel.java prevents proper persistence of permission settings, enabling local privilege escalation on affected Android versions without additional privileges or user interaction.

Why it matters to the business

Malicious applications on Android devices could silently obtain elevated access, increasing risk of data theft, unauthorized actions, or further compromise across the device fleet.

How an attack unfolds

A local attacker deploys a malicious application that repeatedly creates notification channels to exhaust system resources, causing permission settings to fail to persist and thereby granting the app unintended elevated privileges.

How to fix it

Apply the latest Android security updates from Google to all affected devices running versions 10 through 13; enforce regular patch management and device update policies.

How to confirm the fix worked

Verify devices are running patched Android builds by checking system update history and build fingerprints; test notification channel permission behavior under resource-constrained conditions to confirm persistence.

Typical attack path

1. Deploy a malicious application to the target Android device
2. Trigger repeated creation of notification channels to induce resource exhaustion
3. Exploit the failure to persist permission restrictions
4. Execute actions requiring elevated privileges without additional user consent

How to detect it

Review system logs for notification channel creation events accompanied by resource exhaustion warnings or permission persistence failures; correlate with app installation and permission change timestamps.

What your security team should do

• Prioritize deployment of Android security patches across the device population
• Implement mobile device management policies to enforce timely updates
• Monitor for applications exhibiting anomalous notification or permission behavior