CVE-2022-20040
📋 TL;DR
CVE-2022-20040 is a stack-based buffer overflow vulnerability in MediaTek's power_hal_manager_service that allows local attackers to bypass permissions and escalate privileges without user interaction. This affects Android devices using MediaTek chipsets. Exploitation requires local access to the device.
💻 Affected Systems
- MediaTek-powered Android devices
📦 What is this software?
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise with root/system-level access, allowing installation of persistent malware, data theft, and bypassing all security controls.
Likely Case
Local privilege escalation to gain elevated permissions for malicious activities like accessing sensitive data or installing backdoors.
If Mitigated
Limited impact if patched or if device has strong isolation controls preventing local code execution.
🎯 Exploit Status
Requires local access and ability to execute code; buffer overflow exploitation requires specific knowledge of the vulnerable service.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patch ID: ALPS06219150
Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/February-2022
Restart Required: Yes
Instructions:
1. Check with device manufacturer for firmware updates. 2. Apply MediaTek patch ALPS06219150. 3. Reboot device after update. 4. Verify patch installation.
🔧 Temporary Workarounds
Restrict local app installations
androidPrevent installation of untrusted applications that could exploit the vulnerability.
Disable unnecessary services
androidIf possible, restrict access to power_hal_manager_service through SELinux policies or service restrictions.
🧯 If You Can't Patch
- Isolate affected devices from sensitive networks and data
- Implement application allowlisting to prevent malicious app execution
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against manufacturer's security bulletin; examine if patch ALPS06219150 is applied.Check Version:
adb shell getprop ro.build.version.security_patch (for Android devices)Verify Fix Applied:
Verify patch installation through system update logs or by checking firmware version includes the security patch.📡 Detection & Monitoring
Log Indicators:
- Unusual privilege escalation attempts
- Crashes in power_hal_manager_service
- SELinux denials related to power management services
Network Indicators:
- None - local exploitation only
SIEM Query:
Process creation events showing unexpected privilege escalation or service crashes in power management components