CVE-2021-25385
📋 TL;DR
This vulnerability allows attackers to execute arbitrary code on the mediaextractor process through improper input validation in Samsung's libsdffextractor library. It affects Samsung mobile devices running vulnerable versions of the library prior to the May 2021 security update. Successful exploitation could lead to complete device compromise.
💻 Affected Systems
- Samsung mobile devices
📦 What is this software?
Android by Google
Android by Google
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover with root privileges, allowing data theft, surveillance, persistence, and use as a foothold for network attacks.
Likely Case
Remote code execution on affected Samsung devices when processing malicious media files, potentially leading to data exfiltration or device compromise.
If Mitigated
Limited impact if devices are patched or isolated from untrusted media sources, with potential denial of service if exploitation attempts are blocked.
🎯 Exploit Status
Exploitation requires tricking user into opening malicious media file or automatic processing through apps.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: SMR MAY-2021 Release 1 or later
Vendor Advisory: https://security.samsungmobile.com/securityUpdate.smsb?year=2021&month=5
Restart Required: Yes
Instructions:
1. Check for system updates in device settings. 2. Install May 2021 security update. 3. Reboot device after installation.
🔧 Temporary Workarounds
Disable automatic media processing
allPrevent automatic parsing of media files by untrusted applications
Restrict media file sources
allOnly open media files from trusted sources and avoid unknown files
🧯 If You Can't Patch
- Isolate affected devices from untrusted networks and media sources
- Implement application allowlisting to restrict which apps can process media files
🔍 How to Verify
Check if Vulnerable:
Check device 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 May 2021 or later📡 Detection & Monitoring
Log Indicators:
- MediaExtractor process crashes
- Unusual media file processing from untrusted sources
Network Indicators:
- Unexpected outbound connections after media file processing
SIEM Query:
process_name:mediaextractor AND (event_type:crash OR suspicious_file_activity)