CVE-2022-20495

What it actually does

Logic error in AccessibilityManager.java getEnabledAccessibilityServiceList permits an application to conceal its registered accessibility service, enabling unauthorized local privilege escalation without additional permissions or user interaction.

Why it matters to the business

Attackers with local access can silently elevate privileges on affected Android devices, risking data theft, unauthorized actions, and device compromise across the installed base of Android 10 through 13.

How an attack unfolds

An attacker crafts or deploys a malicious Android application that registers an accessibility service; due to the flawed list filtering logic the service is hidden from system queries, allowing the app to perform privileged operations locally with no user interaction required.

How to fix it

Apply the latest Android security patches from device vendors; monitor for updates addressing A-243849844 and upgrade devices beyond the vulnerable versions (Android 10-13) as soon as vendor patches become available.

How to confirm the fix worked

Confirm devices are running patched Android builds by checking the security patch level in Settings > About phone; review source changes in AccessibilityManager.java to verify the list filtering logic correction.

Typical attack path

1. Install malicious application on target device
2. Register accessibility service via the vulnerable API path
3. Exploit logic error to hide the service from enumeration
4. Abuse elevated context for privilege escalation actions
5. Perform unauthorized operations such as data access or configuration changes

How to detect it

Review application logs and accessibility service registration events for unexpected hidden services; correlate with package installation timestamps and audit logs for local privilege abuse indicators.

What your security team should do

• Prioritize patching all managed Android devices to current vendor releases
• Enforce app-vetting policies to restrict sideloading of untrusted applications
• Monitor vendor security bulletins for explicit fixes to this accessibility service enumeration flaw