CVE-2021-0553
📋 TL;DR
This vulnerability allows a malicious app to bypass device admin settings through unclear UI in Android's AppSwitchPreference component. It enables local privilege escalation from a standard user to device administrator privileges. Only affects Android 11 devices with user interaction required for exploitation.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Attacker gains full device administrator privileges, allowing them to remotely wipe device, enforce policies, control apps, and access sensitive data.
Likely Case
Malicious app tricks user into granting device admin rights through confusing UI, enabling data theft and device control.
If Mitigated
With proper app vetting and user education, exploitation requires explicit user consent through social engineering.
🎯 Exploit Status
Requires user interaction and app installation. No public exploit code available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Patch Level 2021-06-01 or later
Vendor Advisory: https://source.android.com/security/bulletin/pixel/2021-06-01
Restart Required: Yes
Instructions:
1. Check Android version in Settings > About phone > Android version. 2. If Android 11, go to Settings > System > System update. 3. Install Android Security Patch Level 2021-06-01 or later. 4. Restart device after update.
🔧 Temporary Workarounds
Disable Unknown Sources
androidPrevent installation of apps from unknown sources to reduce attack surface
Settings > Security > Install unknown apps > Disable for all apps
Review Device Admin Apps
androidRegularly review and remove unnecessary device administrator apps
Settings > Security > Device admin apps > Review and disable unnecessary apps
🧯 If You Can't Patch
- Restrict app installations to Google Play Store only
- Educate users about suspicious permission requests and device admin prompts
🔍 How to Verify
Check if Vulnerable:
Check Android version: Settings > About phone > Android version. If Android 11 and Security Patch Level earlier than 2021-06-01, 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: Settings > About phone > Android Security Patch Level. Should show 2021-06-01 or later.📡 Detection & Monitoring
Log Indicators:
- Unexpected device admin activation events
- AppSwitchPreference permission bypass attempts
Network Indicators:
- No network indicators - local privilege escalation only
SIEM Query:
Device logs showing unexpected device_admin activation from non-trusted apps