CVE-2025-31711
📋 TL;DR
A null pointer dereference vulnerability in the cplog service allows local attackers to crash the system without requiring elevated privileges. This affects systems running vulnerable versions of the cplog service, potentially causing denial of service. The vulnerability requires local access to the affected system.
💻 Affected Systems
- cplog service
📦 What is this software?
Android by Google
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete system crash requiring physical or remote console access to reboot, disrupting all services on the affected host.
Likely Case
Local denial of service affecting the cplog service and potentially related system functions until system reboot.
If Mitigated
Minimal impact with proper access controls preventing unauthorized local users from executing the exploit.
🎯 Exploit Status
Exploitation requires local access but no special privileges. Simple null pointer dereference likely triggered through specific service interactions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched versions
Vendor Advisory: https://www.unisoc.com/en_us/secy/announcementDetail/1929773763314909186
Restart Required: Yes
Instructions:
1. Check the Unisoc security advisory for affected versions. 2. Apply vendor-provided patches or updates. 3. Restart the cplog service or reboot the system as required.
🔧 Temporary Workarounds
Restrict local access
linuxLimit local shell/console access to trusted users only through proper authentication and authorization controls.
# Use proper user/group permissions and access controls
# Example: chmod 750 /path/to/cplog
# Configure sudo/doas policies appropriately
Service isolation
linuxRun cplog service with minimal privileges and in isolated environments if possible.
# Use systemd service restrictions
# Example: systemctl edit cplog.service
# Add: NoNewPrivileges=yes, PrivateTmp=yes, ProtectSystem=strict
🧯 If You Can't Patch
- Implement strict access controls to prevent unauthorized local users from accessing the system
- Monitor system logs for cplog service crashes and implement automated recovery procedures
🔍 How to Verify
Check if Vulnerable:
Check cplog service version against vendor advisory. Monitor for service crashes via system logs.Check Version:
# Check cplog version - exact command depends on implementation
# Example: cplog --version 2>/dev/null || strings $(which cplog) | grep -i versionVerify Fix Applied:
Verify patched version is installed and cplog service runs without crashes during normal operation.📡 Detection & Monitoring
Log Indicators:
- Segmentation fault or null pointer dereference errors in cplog logs
- Unexpected cplog service crashes in systemd/journal logs
- Core dumps from cplog process
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
source="systemd" AND (process="cplog" AND (event="segmentation fault" OR event="crash" OR event="core dumped"))