CVE-2021-0525
📋 TL;DR
This vulnerability in Android's memory management driver allows local privilege escalation through an out-of-bounds write caused by use-after-free. Attackers can gain elevated privileges without user interaction or additional execution permissions. It affects Android devices using specific System-on-Chip (SoC) implementations.
💻 Affected Systems
- Android devices with vulnerable SoC implementations
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise with root/system-level access, allowing installation of persistent malware, data theft, and bypassing all security controls.
Likely Case
Local privilege escalation to gain elevated permissions for data access, app manipulation, or persistence mechanisms.
If Mitigated
Limited impact if device is fully patched, uses security features like SELinux, and has minimal attack surface.
🎯 Exploit Status
Requires local access but no user interaction; typical exploitation would be through malicious apps or physical access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Bulletin June 2021 patches
Vendor Advisory: https://source.android.com/security/bulletin/2021-06-01
Restart Required: Yes
Instructions:
1. Apply Android Security Update from June 2021 or later. 2. For OEM devices, install manufacturer-provided firmware updates. 3. Reboot device after update installation.
🔧 Temporary Workarounds
Restrict app installations
androidOnly install apps from trusted sources like Google Play Store to reduce attack surface
Enable Google Play Protect
androidUse built-in malware scanning to detect potentially malicious apps
🧯 If You Can't Patch
- Isolate vulnerable devices from sensitive networks and data
- Implement application allowlisting to prevent unauthorized app execution
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Android version. If patch level is before June 2021, device may be vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify Android security patch level shows June 2021 or later in Settings > About phone > Android version.📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- Memory corruption errors in dmesg
- Unexpected privilege escalation attempts
Network Indicators:
- Unusual outbound connections from privileged processes
SIEM Query:
Process elevation from non-privileged to privileged context without legitimate cause