CVE-2020-0234
📋 TL;DR
This vulnerability allows local privilege escalation on Android devices through an out-of-bounds write in the kernel's audio driver. Attackers can gain elevated privileges without user interaction or additional permissions. It affects Android devices running vulnerable kernel versions.
💻 Affected Systems
- Android devices with Qualcomm/Cirrus Logic audio hardware
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to gain root access, install persistent malware, access all user data, and bypass security controls.
Likely Case
Local privilege escalation allowing malware to elevate from user to kernel privileges, potentially leading to data theft or further system compromise.
If Mitigated
Minimal impact if devices are patched or have security controls like SELinux enforcing mode that can limit exploitation.
🎯 Exploit Status
Requires local access but no user interaction. Exploitation involves kernel memory corruption techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android security patch level June 2020 or later
Vendor Advisory: https://source.android.com/security/bulletin/pixel/2020-06-01
Restart Required: Yes
Instructions:
1. Check for Android system updates in Settings > System > Advanced > System update. 2. Install June 2020 or later security patch. 3. Reboot device after installation.
🔧 Temporary Workarounds
Disable vulnerable audio driver
linuxRemove or disable the crus_afe kernel module if not needed
rmmod crus_afe
echo 'blacklist crus_afe' >> /etc/modprobe.d/blacklist.conf
🧯 If You Can't Patch
- Restrict physical access to devices and implement application allowlisting
- Enable SELinux enforcing mode and implement least privilege principles
🔍 How to Verify
Check if Vulnerable:
Check kernel version and security patch date: Settings > About phone > Android version > Security patch levelCheck Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level is June 2020 or later and kernel version has been updated📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- SELinux denials for crus_afe module
- Unexpected privilege escalation attempts
Network Indicators:
- None - local exploitation only
SIEM Query:
source="android_kernel" AND ("crus_afe" OR "msm-cirrus-playback" OR kernel_panic)