CVE-2022-20028
📋 TL;DR
This CVE-2022-20028 is a Bluetooth stack vulnerability in MediaTek chipsets that allows local attackers to write beyond allocated memory boundaries, potentially gaining elevated privileges on affected devices. Exploitation requires no user interaction or additional permissions, making it particularly dangerous for devices with vulnerable Bluetooth implementations. The vulnerability affects Android devices using specific MediaTek chipsets.
💻 Affected Systems
- MediaTek Bluetooth chipsets
- Android devices with MediaTek chipsets
📦 What is this software?
Android by Google
Android by Google
Android by Google
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Full device compromise with root/system-level access, allowing complete control over the device, data theft, and persistence mechanisms.
Likely Case
Local privilege escalation to gain elevated permissions, potentially enabling further attacks, data access, or installation of malicious software.
If Mitigated
Limited impact with proper patching and Bluetooth security controls, potentially only affecting Bluetooth functionality without system compromise.
🎯 Exploit Status
Exploitation requires Bluetooth proximity and knowledge of the vulnerability, but no authentication or user interaction. The technical details suggest moderate complexity for reliable exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware with patch ID ALPS06198663
Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/February-2022
Restart Required: Yes
Instructions:
1. Check device manufacturer for security updates. 2. Apply the February 2022 MediaTek security patch. 3. Update Bluetooth firmware if available. 4. Reboot device after patching.
🔧 Temporary Workarounds
Disable Bluetooth
androidTurn off Bluetooth functionality to prevent exploitation via this vector
adb shell settings put global bluetooth_on 0
Settings > Connected devices > Connection preferences > Bluetooth > Turn off
Restrict Bluetooth visibility
androidSet Bluetooth to non-discoverable mode to reduce attack surface
adb shell am start -a android.settings.BLUETOOTH_SETTINGS
Settings > Connected devices > Bluetooth > Device name > Turn off 'Visible to other devices'
🧯 If You Can't Patch
- Disable Bluetooth when not in use and enable only for trusted connections
- Implement network segmentation to isolate vulnerable devices from critical systems
🔍 How to Verify
Check if Vulnerable:
Check device settings for MediaTek security patch level - if before February 2022, likely vulnerable. Use: adb shell getprop ro.build.version.security_patchCheck Version:
adb shell getprop ro.build.version.security_patch && adb shell getprop ro.mediatek.version.releaseVerify Fix Applied:
Verify security patch date is February 2022 or later: adb shell getprop ro.build.version.security_patch📡 Detection & Monitoring
Log Indicators:
- Bluetooth stack crashes
- Unexpected privilege escalation events
- SELinux/avc denials related to Bluetooth
Network Indicators:
- Unusual Bluetooth pairing attempts
- Multiple Bluetooth connection attempts from unknown devices
SIEM Query:
source="android_logs" AND ("bluetooth" AND ("crash" OR "segfault" OR "privilege")) OR source="bluetooth_logs" AND "unexpected"