CVE-2022-48390
📋 TL;DR
CVE-2022-48390 is a missing permission check vulnerability in telephony services that allows local attackers to escalate privileges without requiring additional execution privileges. This affects Android devices with Unisoc chipsets, potentially allowing attackers to gain elevated system access.
💻 Affected Systems
- Android devices with Unisoc chipsets
📦 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 full system control, access sensitive telephony data, intercept calls/SMS, and potentially install persistent malware.
Likely Case
Local privilege escalation allowing access to telephony functions and system resources normally restricted to privileged apps.
If Mitigated
Limited impact with proper app sandboxing and SELinux policies in place, though telephony functions remain at risk.
🎯 Exploit Status
Requires local access but no special permissions. Likely exploitable by malicious apps or users with physical access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check device manufacturer for specific security patch level
Vendor Advisory: https://www.unisoc.com/en_us/secy/announcementDetail/1664822361414762498
Restart Required: Yes
Instructions:
1. Check device manufacturer's security updates. 2. Apply latest Android security patch. 3. For Unisoc reference designs, apply vendor-provided patches. 4. Reboot device after update.
🔧 Temporary Workarounds
Restrict app permissions
androidLimit telephony permissions for untrusted apps to reduce attack surface
Disable unnecessary telephony services
androidDisable telephony features not in use if device supports it
🧯 If You Can't Patch
- Isolate affected devices from sensitive networks and data
- Implement strict app installation policies and only allow trusted sources
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Android version. Compare with manufacturer's security bulletin.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level includes October 2022 or later patches. Check with manufacturer for specific patch information.📡 Detection & Monitoring
Log Indicators:
- Unusual telephony service access attempts
- Permission denial logs for telephony services
- SELinux denials related to telephony
Network Indicators:
- Not applicable - local exploit only
SIEM Query:
source="android" AND (event="permission_denied" AND service="telephony") OR (event="selinux_denial" AND target="telephony_service")