CVE-2024-31317
📋 TL;DR
This vulnerability allows local privilege escalation on Android devices through unsafe deserialization in ZygoteProcess.java. An attacker with WRITE_SECURE_SETTINGS permission can execute arbitrary code as any app, potentially gaining elevated privileges. All Android users with affected versions are vulnerable.
💻 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
Complete device compromise allowing attacker to install persistent malware, access sensitive data, and control device functions.
Likely Case
Local attacker gains elevated privileges to access other apps' data or install malicious applications.
If Mitigated
Attack limited to sandboxed environment with minimal impact due to proper app isolation.
🎯 Exploit Status
Exploitation requires local access and WRITE_SECURE_SETTINGS permission. No user interaction needed once initial access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: June 2024 Android Security Patch
Vendor Advisory: https://source.android.com/security/bulletin/2024-06-01
Restart Required: Yes
Instructions:
1. Check for system updates in Settings > System > System update. 2. Install June 2024 Android security patch. 3. Reboot device after installation.
🔧 Temporary Workarounds
Restrict WRITE_SECURE_SETTINGS permission
androidLimit which apps have WRITE_SECURE_SETTINGS permission through device policy or app permissions management.
🧯 If You Can't Patch
- Implement strict app vetting process to prevent malicious apps from obtaining WRITE_SECURE_SETTINGS permission
- Use mobile device management (MDM) solutions to enforce security policies and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Android version. If patch level is before June 2024, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level shows 'June 5, 2024' or later in Settings > About phone > Android version.📡 Detection & Monitoring
Log Indicators:
- Unusual Zygote process activity
- Multiple app launches with elevated permissions
- WRITE_SECURE_SETTINGS permission abuse logs
Network Indicators:
- Unusual network traffic from system processes
- Suspicious app installation traffic
SIEM Query:
process_name:zygote AND (permission:WRITE_SECURE_SETTINGS OR privilege_escalation:true)🔗 References
- https://android.googlesource.com/platform/frameworks/base/+/e25a0e394bbfd6143a557e1019bb7ad992d11985
- https://source.android.com/security/bulletin/2024-06-01
- https://android.googlesource.com/platform/frameworks/base/+/e25a0e394bbfd6143a557e1019bb7ad992d11985
- https://source.android.com/security/bulletin/2024-06-01
