CVE-2023-42745
📋 TL;DR
This CVE describes a missing permission check vulnerability in telecom services that could allow local attackers to escalate privileges without needing additional execution privileges. It affects systems running vulnerable telecom service components, potentially impacting devices and infrastructure using affected Unisoc implementations.
💻 Affected Systems
- Unisoc telecom service components
📦 What is this software?
Android by Google
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
An attacker with local access could gain root/system-level privileges, potentially compromising the entire device, accessing sensitive data, or establishing persistence.
Likely Case
Local users or malicious apps could elevate privileges to access restricted functions or data they shouldn't normally have access to.
If Mitigated
With proper access controls and isolation, impact would be limited to the compromised user context without system-wide compromise.
🎯 Exploit Status
Exploitation requires local access but no special permissions; complexity is low once local access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched versions
Vendor Advisory: https://www.unisoc.com/en_us/secy/announcementDetail/1731138365803266049
Restart Required: Yes
Instructions:
1. Check vendor advisory for affected versions. 2. Apply security updates from device manufacturer or carrier. 3. Reboot device after update installation.
🔧 Temporary Workarounds
Restrict local access
allLimit physical and logical access to devices to reduce attack surface
Application sandboxing
androidEnsure applications run with minimal necessary permissions
🧯 If You Can't Patch
- Implement strict access controls to limit who has local device access
- Monitor for suspicious privilege escalation attempts and unauthorized system modifications
🔍 How to Verify
Check if Vulnerable:
Check device manufacturer security bulletins or contact vendor to determine if specific device/model is affectedCheck Version:
On Android: Settings > About phone > Android version/Security patch levelVerify Fix Applied:
Verify security patch level is updated beyond vulnerable versions; check with device manufacturer for specific patch verification📡 Detection & Monitoring
Log Indicators:
- Unexpected privilege escalation events
- Telecom service permission violations
- Unauthorized access to protected system functions
Network Indicators:
- Local privilege escalation typically doesn't generate network traffic
SIEM Query:
Search for telephony service permission failures or unexpected UID/GID changes in system logs