CVE-2017-13320
📋 TL;DR
CVE-2017-13320 is an out-of-bounds read vulnerability in the libmpeg2dec library's impeg2d_bit_stream_flush() function. This allows remote attackers to cause denial of service through memory corruption when processing malicious MPEG-2 video files. The vulnerability primarily affects Android devices using vulnerable versions of the library.
💻 Affected Systems
- Android
- Devices using libmpeg2dec library
📦 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
Remote denial of service causing device instability, crashes, or reboot when processing malicious MPEG-2 content.
Likely Case
Application crashes or instability when processing malformed MPEG-2 video files, potentially affecting media playback functionality.
If Mitigated
Limited impact with proper input validation and memory protection mechanisms in place.
🎯 Exploit Status
Requires user interaction to open malicious MPEG-2 file. No privilege escalation demonstrated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android security patch level 2018-05-01 or later
Vendor Advisory: https://source.android.com/docs/security/bulletin/pixel/2018-05-01
Restart Required: Yes
Instructions:
1. Apply Android security patch level 2018-05-01 or later. 2. Update affected devices through standard Android update channels. 3. Reboot device after update installation.
🔧 Temporary Workarounds
Disable MPEG-2 processing
androidBlock or disable MPEG-2 video file processing in affected applications
Input validation
allImplement strict input validation for media files before processing
🧯 If You Can't Patch
- Restrict processing of untrusted MPEG-2 video files
- Implement application sandboxing to limit impact of potential crashes
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Android security patch levelCheck Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level is 2018-05-01 or later📡 Detection & Monitoring
Log Indicators:
- Application crashes related to media processing
- SIGSEGV or memory access violation logs
Network Indicators:
- Unusual MPEG-2 file downloads
- Media file processing failures
SIEM Query:
source="android_logs" AND ("segmentation fault" OR "SIGSEGV" OR "libmpeg2dec")