CVE-2024-39433
📋 TL;DR
This vulnerability in the drm service allows an attacker with local system execution privileges to perform an out-of-bounds write, potentially causing denial of service. It affects systems using the vulnerable drm service component. Attackers need local access and elevated privileges to exploit this flaw.
💻 Affected Systems
- Unisoc DRM Service
📦 What is this software?
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Local denial of service leading to system instability or crash, potentially allowing further privilege escalation if combined with other vulnerabilities.
Likely Case
Local denial of service affecting the drm service functionality, requiring system reboot to restore normal operation.
If Mitigated
Minimal impact if proper privilege separation and access controls prevent unauthorized users from obtaining system execution privileges.
🎯 Exploit Status
Exploitation requires local access and system execution privileges. No public exploit code identified in the reference.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in reference, but patch is available from vendor
Vendor Advisory: https://www.unisoc.com/en_us/secy/announcementDetail/1830802995705610241
Restart Required: Yes
Instructions:
1. Check vendor advisory for specific patch details. 2. Apply security updates from device manufacturer. 3. Reboot device after patch installation. 4. Verify patch application through version checks.
🔧 Temporary Workarounds
Restrict system privilege access
androidLimit which users and applications have system execution privileges to reduce attack surface
Disable unnecessary drm services
androidIf drm functionality is not required, consider disabling the service
🧯 If You Can't Patch
- Implement strict access controls to prevent unauthorized users from obtaining system execution privileges
- Monitor for abnormal drm service behavior and system crashes that could indicate exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check device manufacturer security bulletins for affected models and versions. Review system logs for drm service crashes.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level through device settings > About phone > Android security patch level. Check with manufacturer for specific patch verification.📡 Detection & Monitoring
Log Indicators:
- DRM service crashes or abnormal termination
- System logs showing privilege escalation attempts to system level
- Kernel panic or system instability events
Network Indicators:
- No network indicators - this is a local vulnerability
SIEM Query:
source="android_system" AND (process="drm" OR service="drm") AND (event="crash" OR event="abnormal_exit")