CVE-2021-1044
📋 TL;DR
This vulnerability allows local privilege escalation on Android devices through an out-of-bounds write in the identity support component. Attackers can gain elevated privileges without user interaction or additional execution permissions. Affects Android devices with vulnerable kernel versions.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to gain root/system-level access, install persistent malware, access all user data, and bypass security controls.
Likely Case
Local privilege escalation enabling attackers to bypass app sandboxing, access sensitive data from other apps, and perform unauthorized system operations.
If Mitigated
Limited impact if devices are patched, have strict app isolation, and minimal local attack surface.
🎯 Exploit Status
Requires local access but no user interaction. Exploitation involves memory corruption techniques to trigger out-of-bounds write.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android November 2021 security patch or later
Vendor Advisory: https://source.android.com/security/bulletin/pixel/2021-11-01
Restart Required: Yes
Instructions:
1. Check for system updates in Settings > System > System update. 2. Install November 2021 or later Android security patch. 3. Reboot device after installation.
🔧 Temporary Workarounds
Restrict local app installation
androidPrevent installation of untrusted apps that could exploit local vulnerabilities
adb shell settings put secure install_non_market_apps 0
🧯 If You Can't Patch
- Implement strict app vetting and only install apps from trusted sources like Google Play Store
- Use mobile device management (MDM) solutions to enforce security policies and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Android security patch level. If before November 2021, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify Android security patch level shows November 2021 or later date.📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- Unexpected privilege escalation attempts in audit logs
- Abnormal process behavior indicating root access
Network Indicators:
- Not applicable - local vulnerability
SIEM Query:
source="android_kernel" AND (event_type="panic" OR event_type="oops") AND component="identity_support"