CVE-2021-0984
📋 TL;DR
This vulnerability in Android 12 allows local privilege escalation without user interaction. An incorrectly unbound service in ManagedServices.java enables permission bypass, potentially letting attackers gain elevated privileges on affected devices. Only Android 12 devices are affected.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to execute arbitrary code with system privileges, access sensitive data, or install persistent malware.
Likely Case
Local attackers gaining elevated privileges to access protected system resources or user data they shouldn't have access to.
If Mitigated
Limited impact if devices are fully patched and have proper security controls like verified boot and app sandboxing.
🎯 Exploit Status
Requires local access to device. No user interaction needed but attacker needs some level of initial access to exploit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android 12 with December 2021 security patch level or later
Vendor Advisory: https://source.android.com/security/bulletin/pixel/2021-12-01
Restart Required: Yes
Instructions:
1. Check Android version and security patch level in Settings > About phone. 2. If on Android 12 with patch level before December 2021, install latest security update via Settings > System > System update. 3. Reboot device after update completes.
🔧 Temporary Workarounds
Disable unnecessary services
androidReduce attack surface by disabling unused system services and permissions
Restrict app installations
androidOnly install apps from trusted sources and review app permissions carefully
🧯 If You Can't Patch
- Isolate affected devices from sensitive networks and data
- Implement strict app installation policies and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check Android version (must be 12) and security patch level (must be before December 2021) in Settings > About phoneCheck Version:
adb shell getprop ro.build.version.release && adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level shows December 2021 or later in Settings > About phone📡 Detection & Monitoring
Log Indicators:
- Unusual service binding/unbinding events in system logs
- Permission escalation attempts in security logs
Network Indicators:
- Not applicable - local exploit only
SIEM Query:
Not applicable for typical enterprise SIEM as this is local device exploit