CVE-2023-25221
📋 TL;DR
This vulnerability is a heap buffer overflow in libde265's motion.cc component, allowing attackers to execute arbitrary code or cause denial of service by processing specially crafted HEVC/H.265 video files. It affects any application or system using vulnerable versions of libde265 for video decoding. The impact is particularly severe for media processing servers, video players, and web applications that handle user-uploaded video content.
💻 Affected Systems
- libde265
- applications using libde265 library
- FFmpeg with libde265 support
- VLC media player
- GStreamer plugins
📦 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 (denial of service) when processing malicious video files, potentially disrupting media processing services.
If Mitigated
Contained application crash with minimal system impact if proper sandboxing and privilege separation are implemented.
🎯 Exploit Status
Proof-of-concept exploit code is available in the GitHub issue. Exploitation requires the target to process a malicious HEVC video file.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: libde265 v1.0.11 or later
Vendor Advisory: https://github.com/strukturag/libde265/issues/388
Restart Required: Yes
Instructions:
1. Update libde265 to version 1.0.11 or later. 2. Rebuild or update applications using libde265. 3. Restart affected services. 4. For Linux distributions, use package manager: 'sudo apt update && sudo apt upgrade libde265' (Debian/Ubuntu) or equivalent for other distributions.
🔧 Temporary Workarounds
Disable HEVC video processing
allTemporarily disable HEVC/H.265 video decoding in affected applications until patched.
Application-specific configuration changes required
Input validation and sandboxing
linuxImplement strict input validation for video files and run media processing in isolated containers.
docker run --security-opt no-new-privileges --cap-drop=ALL -it application-container
🧯 If You Can't Patch
- Implement network segmentation to isolate vulnerable systems from untrusted networks
- Deploy application allowlisting to prevent execution of unauthorized media processing applications
🔍 How to Verify
Check if Vulnerable:
Check libde265 version: 'libde265 --version' or 'dpkg -l | grep libde265' or 'rpm -qa | grep libde265'. Version 1.0.10 or earlier is vulnerable.Check Version:
libde265 --version 2>/dev/null || pkg-config --modversion libde265 || dpkg -l libde265 2>/dev/null | grep ^ii | awk '{print $3}' || rpm -q --queryformat='%{VERSION}' libde265 2>/dev/nullVerify Fix Applied:
Confirm libde265 version is 1.0.11 or later using version check commands. Test with known malicious HEVC samples if available.📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults in libde265
- Memory corruption errors in system logs
- Abnormal process termination of media applications
Network Indicators:
- Unusual outbound connections from media processing servers
- Large HEVC file uploads to web applications
SIEM Query:
source="*syslog*" AND ("segmentation fault" OR "SIGSEGV") AND process="*libde265*" OR source="*application*" AND event="crash" AND module="motion.cc"