CVE-2021-0652
📋 TL;DR
This vulnerability in Android's VectorDrawable component allows memory corruption through thread-unsafe object sharing, potentially enabling local privilege escalation without user interaction. It affects Android devices running versions 8.1 through 11.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
Android by Google
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
An attacker gains full system control on an affected Android device, potentially accessing sensitive data, installing malware, or persisting access.
Likely Case
Malicious apps exploit the vulnerability to elevate privileges, bypassing sandbox restrictions to access other apps' data or system resources.
If Mitigated
With proper patching, the vulnerability is eliminated; without patching, Android's security sandbox may limit but not prevent exploitation.
🎯 Exploit Status
Exploitation requires a malicious app to be installed; no user interaction needed once installed. The vulnerability involves complex memory corruption techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Patch Level October 2021 or later
Vendor Advisory: https://source.android.com/security/bulletin/2021-10-01
Restart Required: Yes
Instructions:
1. Check for Android system updates in Settings > System > System update. 2. Install the October 2021 security patch or later. 3. Restart the device after installation.
🔧 Temporary Workarounds
Disable unknown app installations
androidPrevent installation of apps from unknown sources to reduce attack surface
Settings > Security > Install unknown apps > Disable for all apps
Use Google Play Protect
androidEnable Google's built-in malware scanning for installed apps
Settings > Security > Google Play Protect > Scan device for security threats
🧯 If You Can't Patch
- Isolate affected devices from sensitive networks and data
- Implement strict app installation policies and monitor for suspicious app behavior
🔍 How to Verify
Check if Vulnerable:
Check Android version and security patch level in Settings > About phone > Android version and Security patch levelCheck Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify Security patch level shows October 2021 or later date📡 Detection & Monitoring
Log Indicators:
- Unusual privilege escalation attempts in system logs
- Suspicious app behavior accessing VectorDrawable components
Network Indicators:
- Unusual network traffic from apps with elevated privileges
SIEM Query:
Search for events related to VectorDrawable component access or privilege escalation in Android system logs