CVE-2021-0970
📋 TL;DR
This vulnerability in Android's GPS navigation message handling allows local privilege escalation without user interaction. It affects Android devices running versions 9 through 12, enabling attackers to gain elevated system privileges by exploiting a parcel serialization mismatch.
💻 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-level control over the device, potentially accessing sensitive data, installing malware, or disabling security features.
Likely Case
Local privilege escalation leading to unauthorized access to system resources or user data.
If Mitigated
Limited impact if devices are patched or isolated, but unpatched devices remain vulnerable to local attacks.
🎯 Exploit Status
Exploitation requires local access and knowledge of Android parcel handling, but no user interaction is needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Bulletin December 2021 patches
Vendor Advisory: https://source.android.com/security/bulletin/2021-12-01
Restart Required: Yes
Instructions:
1. Check for system updates in device settings. 2. Apply the December 2021 Android security patch. 3. Restart the device after installation.
🔧 Temporary Workarounds
Restrict app installations
androidLimit installation of untrusted apps to reduce the attack surface from local malicious applications.
Enable 'Install unknown apps' restrictions in Android settings for all apps.
🧯 If You Can't Patch
- Isolate affected devices from sensitive networks to limit potential damage from compromised systems.
- Implement strict app vetting and monitoring to detect suspicious local activity indicative of exploitation attempts.
🔍 How to Verify
Check if Vulnerable:
Check the Android version in Settings > About phone > Android version; if it is 9, 10, 11, or 12 and not patched with December 2021 updates, it is vulnerable.Check Version:
adb shell getprop ro.build.version.releaseVerify Fix Applied:
Verify the security patch level in Settings > About phone > Android version; ensure it includes December 2021 or later.📡 Detection & Monitoring
Log Indicators:
- Unusual system-level process activity or privilege escalation attempts in Android logs.
Network Indicators:
- None, as this is a local exploit with no network indicators.
SIEM Query:
Search for logs indicating unexpected system service access or parcel-related errors in Android device monitoring.