CVE-2022-48392
📋 TL;DR
CVE-2022-48392 is a missing permission check vulnerability in the dialer service on Unisoc chipsets, allowing local attackers to escalate privileges without requiring additional execution privileges. This affects Android devices using Unisoc chipsets where the dialer service doesn't properly validate caller permissions before performing sensitive operations.
💻 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
An attacker with physical access or a malicious app could gain root/system-level privileges, completely compromising the device, accessing all data, and installing persistent malware.
Likely Case
Malicious apps could bypass sandbox restrictions to access sensitive phone functions, make unauthorized calls, access contacts/call logs, or perform other privileged operations.
If Mitigated
With proper app sandboxing and security updates, the impact is limited to apps that have already bypassed initial security checks.
🎯 Exploit Status
Requires local access or ability to install/execute malicious code. No public exploit code available as of knowledge cutoff.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Vendor-specific security updates (check with device manufacturer)
Vendor Advisory: https://www.unisoc.com/en_us/secy/announcementDetail/1664822361414762498
Restart Required: Yes
Instructions:
1. Check with device manufacturer for security updates. 2. Apply the latest security patch from device settings. 3. Reboot device after update installation.
🔧 Temporary Workarounds
Restrict app installations
androidOnly install apps from trusted sources like Google Play Store and disable unknown sources installation.
Settings > Security > Unknown sources (disable)
Review app permissions
androidRegularly review and restrict app permissions, especially for dialer/phone-related permissions.
Settings > Apps > [App Name] > Permissions
🧯 If You Can't Patch
- Implement mobile device management (MDM) to control app installations and permissions
- Isolate affected devices from sensitive networks and data
🔍 How to Verify
Check if Vulnerable:
Check device chipset manufacturer and security patch level in Settings > About phone > Android security patch levelCheck Version:
Settings > About phone > Android version / Security patch levelVerify Fix Applied:
Verify security patch level is after the vulnerability disclosure date (September 2022) and check with manufacturer for specific patch information📡 Detection & Monitoring
Log Indicators:
- Unusual dialer service activity
- Permission bypass attempts in system logs
- Unexpected privilege escalation events
Network Indicators:
- Unauthorized phone calls or SMS from compromised devices
SIEM Query:
Look for dialer service permission errors or unexpected service calls in Android system logs