CVE-2021-0497
📋 TL;DR
This vulnerability in Android's memory management driver allows local privilege escalation through memory corruption via use-after-free. Attackers can exploit it without user interaction or additional privileges. It affects Android devices with specific System-on-Chip (SoC) implementations.
💻 Affected Systems
- Android devices with specific SoC implementations
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to gain root privileges, install persistent malware, access all user data, and bypass security controls.
Likely Case
Local privilege escalation allowing attackers to elevate from standard user to system-level privileges, potentially installing malicious apps or accessing protected data.
If Mitigated
Limited impact if devices are patched, isolated from untrusted users, and have additional security controls like SELinux enforcement.
🎯 Exploit Status
Requires local access but no user interaction. Exploitation involves memory corruption techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Bulletin May 2021 patches
Vendor Advisory: https://source.android.com/security/bulletin/2021-05-01
Restart Required: Yes
Instructions:
1. Check for Android security updates in device settings. 2. Install May 2021 security patch or later. 3. Reboot device after installation. 4. Verify patch is applied through security patch level.
🔧 Temporary Workarounds
Restrict local access
allLimit physical and remote access to devices to trusted users only
Application sandboxing
androidEnsure Android app sandboxing is enforced to limit potential exploit impact
🧯 If You Can't Patch
- Isolate vulnerable devices from untrusted users and networks
- Implement additional monitoring for privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Android security patch level. If before May 2021, device may be vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify Android security patch level shows May 2021 or later in device settings.📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- Memory management driver crash logs
- Unexpected privilege escalation attempts
Network Indicators:
- None (local exploit only)
SIEM Query:
Search for kernel panic events or memory management driver crashes in device logs