CVE-2024-34731
📋 TL;DR
This CVE describes a race condition vulnerability in Android's TranscodingResourcePolicy.cpp that allows memory corruption. It enables local privilege escalation without requiring user interaction or additional execution privileges. The vulnerability affects Android devices with specific framework versions.
💻 Affected Systems
- Android OS
📦 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 root/system-level privileges on the device, potentially compromising all user data, installing persistent malware, or bypassing security controls.
Likely Case
Local privilege escalation allowing an attacker to elevate from a standard user or app context to higher privileges, potentially accessing sensitive data or system functions.
If Mitigated
With proper security controls like SELinux enforcement and app sandboxing, the impact may be limited to specific contexts rather than full system compromise.
🎯 Exploit Status
Exploitation requires local access and knowledge of race condition timing, but no user interaction is needed. The CWE-362 (race condition) classification suggests timing-dependent exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Android Security Bulletins for specific patch versions
Vendor Advisory: https://source.android.com/docs/security/bulletin
Restart Required: Yes
Instructions:
1. Check for Android security updates in device settings. 2. Apply the latest security patch from device manufacturer. 3. Reboot device after update installation.
🔧 Temporary Workarounds
Restrict app installations
androidOnly install apps from trusted sources like Google Play Store to reduce risk of malicious apps exploiting this vulnerability.
Enable Google Play Protect
androidEnsure Google Play Protect is enabled to scan for potentially harmful apps.
🧯 If You Can't Patch
- Isolate affected devices from sensitive networks and data
- Implement strict app installation policies and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check Android build fingerprint and security patch level in Settings > About phone > Android versionCheck Version:
adb shell getprop ro.build.fingerprintVerify Fix Applied:
Verify security patch level is updated to a version after the vulnerability was addressed (check Android Security Bulletins)📡 Detection & Monitoring
Log Indicators:
- Unexpected privilege escalation events in system logs
- SELinux denials related to transcoding services
Network Indicators:
- Unusual outbound connections from system processes after local exploitation
SIEM Query:
Process elevation from non-privileged to privileged contexts on Android devices🔗 References
- https://android.googlesource.com/platform/frameworks/av/+/4b68b00993849b6a7f0e6d075bc2c8bb2e184e61
- https://android.googlesource.com/platform/hardware/interfaces/+/0ff19d1f89614fce9454fb415bcbfcbcf3caf76e
- https://android.googlesource.com/platform/hardware/interfaces/+/d63d09261806f7f1aa01406867f2a9e169356fca
- https://android.googlesource.com/platform/system/nfc/+/1037992b9abcde1e3560bd895f62644a68563b3d
- https://android.googlesource.com/platform/system/security/+/d3805312d73433e34ef69a645b553a2969c5dc93
- https://source.android.com/security/bulletin/2024-08-01
