CVE-2021-0485
📋 TL;DR
This vulnerability allows local privilege escalation on Android 11 devices by bypassing background process restrictions. Attackers can gain elevated privileges without user interaction or additional permissions. Only Android 11 devices are affected.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing installation of persistent malware, data theft, and further privilege escalation.
Likely Case
Local attacker gains elevated privileges to access restricted data or install malicious apps.
If Mitigated
Limited impact if device is patched or has strict app isolation policies.
🎯 Exploit Status
Requires local access and knowledge of Android system internals. No public exploit code is available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Patch Level 2021-05-01 or later
Vendor Advisory: https://source.android.com/security/bulletin/2021-05-01
Restart Required: Yes
Instructions:
1. Check for Android system updates in Settings > System > Advanced > System update. 2. Install the May 2021 security patch or later. 3. Reboot device after installation.
🔧 Temporary Workarounds
Disable Picture-in-Picture for untrusted apps
androidPrevent apps from using Picture-in-Picture feature which could be exploited
Settings > Apps & notifications > [App Name] > Advanced > Picture-in-picture > Don't allow
🧯 If You Can't Patch
- Restrict installation of untrusted applications from unknown sources
- Use Android Enterprise or MDM solutions to enforce security policies
🔍 How to Verify
Check if Vulnerable:
Check Android version in Settings > About phone > Android version. If it shows Android 11 and security patch level is before May 2021, device is vulnerable.Check Version:
adb shell getprop ro.build.version.release && adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level is 2021-05-01 or later in Settings > About phone > Android security patch level.📡 Detection & Monitoring
Log Indicators:
- Unusual PiP activity, permission escalation attempts in system logs
Network Indicators:
- None - this is a local privilege escalation
SIEM Query:
Not applicable for typical SIEM monitoring as this is a local device vulnerability