CVE-2020-0321
📋 TL;DR
This vulnerability in Android's mp3 extractor allows remote code execution through an out-of-bounds write caused by uninitialized data. Attackers can exploit this by tricking users into processing malicious mp3 files, potentially gaining full control of affected devices. Only Android 11 devices are affected.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to install malware, steal data, or join devices to botnets without user knowledge.
Likely Case
Malicious apps exploiting the vulnerability to gain elevated privileges or execute arbitrary code within the media processing context.
If Mitigated
Limited impact if devices are patched or if users avoid processing untrusted media files.
🎯 Exploit Status
Exploitation requires user interaction to process a malicious mp3 file, but no authentication or special privileges are needed once triggered.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Patch Level 2020-09-01 or later
Vendor Advisory: https://source.android.com/security/bulletin/android-11
Restart Required: Yes
Instructions:
1. Check for system updates in Settings > System > Advanced > System update. 2. Install Android Security Patch Level 2020-09-01 or later. 3. Restart device after installation.
🔧 Temporary Workarounds
Disable automatic media processing
androidPrevent automatic processing of mp3 files in vulnerable apps
Use alternative media players
androidInstall and use media players with updated mp3 extractor libraries
🧯 If You Can't Patch
- Avoid processing mp3 files from untrusted sources
- Use device management policies to restrict media file processing in enterprise environments
🔍 How to Verify
Check if Vulnerable:
Check Settings > About phone > Android version (must be 11) and Security patch level (must be before 2020-09-01)Check Version:
adb shell getprop ro.build.version.release && adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify Security patch level is 2020-09-01 or later in Settings > About phone📡 Detection & Monitoring
Log Indicators:
- Media server crashes
- Unusual process spawning from media-related services
- SELinux denials related to mp3 processing
Network Indicators:
- Unexpected outbound connections after media file processing
- Downloads of suspicious mp3 files
SIEM Query:
process_name:mediaserver AND (event_type:crash OR parent_process:unusual)