CVE-2023-40476
📋 TL;DR
A stack-based buffer overflow vulnerability in GStreamer's H.265 video parsing allows remote attackers to execute arbitrary code by providing specially crafted video files. This affects any application using vulnerable GStreamer versions to process H.265 video content. Attackers can potentially gain control of affected systems through various attack vectors.
💻 Affected Systems
- GStreamer
- Applications using GStreamer for H.265 video processing
📦 What is this software?
Gstreamer by Gstreamer Project
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with remote code execution leading to data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Application crash (denial of service) or limited code execution in the context of the media processing application.
If Mitigated
Application crash with no code execution if exploit fails or mitigations like ASLR/stack cookies are effective.
🎯 Exploit Status
Exploitation requires crafting malicious H.265 video files and getting them processed by vulnerable systems. Attack vectors could include malicious websites, email attachments, or network shares.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: GStreamer 1.22.6 and later
Vendor Advisory: https://gstreamer.freedesktop.org/security/sa-2023-0008.html
Restart Required: Yes
Instructions:
1. Update GStreamer to version 1.22.6 or later. 2. For Linux distributions, use package manager: 'sudo apt update && sudo apt upgrade gstreamer1.0' (Debian/Ubuntu) or 'sudo yum update gstreamer' (RHEL/CentOS). 3. Restart affected applications or the system.
🔧 Temporary Workarounds
Disable H.265 parsing
allDisable or block H.265 video processing in applications using GStreamer
gst-inspect-1.0 | grep h265
Remove or disable h265parse plugin if possible
Sandbox media processing
linuxRun media processing applications in containers or sandboxes with limited privileges
docker run --security-opt no-new-privileges -v /media:/media media-app
🧯 If You Can't Patch
- Implement strict input validation for video files from untrusted sources
- Deploy application control to prevent execution of unknown media processing applications
🔍 How to Verify
Check if Vulnerable:
Check GStreamer version: 'gst-inspect-1.0 --version' or 'gst-launch-1.0 --version'. If version is below 1.22.6, system is vulnerable.Check Version:
gst-inspect-1.0 --versionVerify Fix Applied:
Verify GStreamer version is 1.22.6 or higher: 'gst-inspect-1.0 --version | grep -q "1.22.[6-9]\|1.2[3-9]" && echo "Patched"'📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults in GStreamer processes
- Unusual memory access patterns in media applications
- Multiple failed attempts to parse video files
Network Indicators:
- Unusual inbound video file transfers to media servers
- HTTP requests for H.265 video files to web applications
SIEM Query:
source="application.log" AND ("segmentation fault" OR "SIGSEGV") AND process="gst*"🔗 References
- https://gstreamer.freedesktop.org/security/sa-2023-0008.html
- https://www.zerodayinitiative.com/advisories/ZDI-23-1458/
- https://gstreamer.freedesktop.org/security/sa-2023-0008.html
- https://lists.debian.org/debian-lts-announce/2023/10/msg00038.html
- https://www.zerodayinitiative.com/advisories/ZDI-23-1458/
