CVE-2023-27103
📋 TL;DR
CVE-2023-27103 is a heap buffer overflow vulnerability in Libde265 v1.0.11's derive_collocated_motion_vectors function that allows attackers to execute arbitrary code or cause denial of service. This affects any application using the vulnerable libde265 library for HEVC/H.265 video decoding. Systems processing untrusted video files are particularly at risk.
💻 Affected Systems
- libde265
- Applications using libde265 for HEVC/H.265 decoding
📦 What is this software?
Libde265 by Struktur
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment
Likely Case
Application crash or denial of service when processing malicious HEVC video files
If Mitigated
Limited impact with proper sandboxing and memory protection mechanisms in place
🎯 Exploit Status
Exploitation requires crafting a malicious HEVC video file that triggers the buffer overflow when decoded
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: libde265 v1.0.12 or later
Vendor Advisory: https://github.com/strukturag/libde265/issues/394
Restart Required: Yes
Instructions:
1. Update libde265 to version 1.0.12 or later using your package manager. 2. For Debian/Ubuntu: sudo apt update && sudo apt upgrade libde265. 3. For source installations: git clone, build, and install from the official repository. 4. Restart any applications using libde265.
🔧 Temporary Workarounds
Disable HEVC video processing
allTemporarily disable HEVC/H.265 video decoding in applications until patched
Application-specific configuration changes required
Sandbox video processing
linuxRun video processing applications in isolated containers or sandboxes
docker run --security-opt no-new-privileges -it application
firejail --private application
🧯 If You Can't Patch
- Implement strict input validation for video files and block suspicious HEVC files
- Deploy memory protection mechanisms like ASLR and DEP to reduce exploit success
🔍 How to Verify
Check if Vulnerable:
Check libde265 version: dpkg -l | grep libde265 or rpm -qa | grep libde265Check Version:
dpkg -l libde265 2>/dev/null || rpm -q libde265 2>/dev/null || pkg info libde265 2>/dev/null || echo 'Check system package manager'Verify Fix Applied:
Verify installed version is 1.0.12 or later: libde265 --version 2>/dev/null || echo 'Check package manager'📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults
- Memory corruption errors in application logs
- Unexpected process termination during video processing
Network Indicators:
- Unusual outbound connections from video processing applications
- Large HEVC file uploads to web services
SIEM Query:
Process: (libde265 OR *hevc*) AND Event: (Segmentation fault OR SIGSEGV OR Access violation)