CVE-2021-25360
📋 TL;DR
This vulnerability allows attackers to execute arbitrary code on Samsung devices by exploiting improper input validation in the libswmfextractor library. It affects Samsung mobile devices running Android versions prior to the April 2021 security update. Successful exploitation gives attackers control over the mediaextractor process.
💻 Affected Systems
- Samsung mobile devices
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing remote code execution, data theft, persistence installation, and device takeover.
Likely Case
Local privilege escalation leading to unauthorized access to sensitive media files and system resources.
If Mitigated
Limited impact with proper patch management and security controls preventing exploitation.
🎯 Exploit Status
Requires local access or ability to trigger media processing with malicious files.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: SMR APR-2021 Release 1 or later
Vendor Advisory: https://security.samsungmobile.com/securityUpdate.smsb
Restart Required: Yes
Instructions:
1. Check for system updates in device settings. 2. Install April 2021 security update or later. 3. Restart device after installation.
🔧 Temporary Workarounds
Disable automatic media processing
androidPrevent automatic parsing of media files by untrusted applications
🧯 If You Can't Patch
- Restrict installation of untrusted applications that could trigger media processing
- Implement application allowlisting to control which apps can access media files
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Software informationCheck Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level shows April 2021 or later date📡 Detection & Monitoring
Log Indicators:
- MediaExtractor process crashes
- Unusual media file processing attempts
Network Indicators:
- Unexpected outbound connections from media-related processes
SIEM Query:
process_name:"mediaextractor" AND (event_type:crash OR suspicious_file_access)