CVE-2023-30928
📋 TL;DR
This vulnerability in telephony services allows local attackers to escalate privileges without requiring additional execution permissions. It affects Android devices with Unisoc chipsets, enabling attackers to gain elevated access to system functions. The flaw requires local access to the device.
💻 Affected Systems
- Android devices with Unisoc chipsets
📦 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, or disable security controls.
Likely Case
Local attacker gains elevated privileges to access telephony functions, modify system settings, or bypass app sandboxing.
If Mitigated
Limited impact if proper app sandboxing and SELinux policies are enforced, though privilege escalation still possible.
🎯 Exploit Status
Exploitation requires local access and knowledge of the missing permission check. No public exploit code available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in public advisory - check with device manufacturer
Vendor Advisory: https://www.unisoc.com/en_us/secy/announcementDetail/1676902764208259073
Restart Required: Yes
Instructions:
1. Contact device manufacturer for patch availability. 2. Apply security updates from device manufacturer. 3. Reboot device after update.
🔧 Temporary Workarounds
Restrict app permissions
androidLimit telephony permissions for untrusted applications
Enable SELinux enforcing mode
androidEnsure SELinux is in enforcing mode to limit privilege escalation
getenforce
setenforce 1
🧯 If You Can't Patch
- Isolate affected devices from sensitive networks and data
- Implement application allowlisting to prevent unauthorized app execution
🔍 How to Verify
Check if Vulnerable:
Check device chipset and firmware version against Unisoc advisory. No simple public detection method available.Check Version:
Settings > About phone > Build number / Security patch levelVerify Fix Applied:
Verify security patch level is updated and check with device manufacturer for specific patch verification.📡 Detection & Monitoring
Log Indicators:
- Unusual telephony service access attempts
- Permission denial logs for telephony services
Network Indicators:
- None - local exploitation only
SIEM Query:
Search for telephony service permission failures or unusual process privilege changes