CVE-2025-47807
📋 TL;DR
A NULL pointer dereference vulnerability in GStreamer's subparse plugin allows attackers to cause denial of service by crashing applications that process malicious subtitle files. This affects any application using GStreamer 1.26.1 or earlier to parse subtitle files. The vulnerability is triggered when processing specially crafted subtitle content.
💻 Affected Systems
- GStreamer
- Applications using GStreamer for subtitle parsing
📦 What is this software?
Gstreamer by Gstreamer Project
⚠️ Risk & Real-World Impact
Worst Case
Application crash leading to denial of service for media processing applications, potentially disrupting media playback or processing services.
Likely Case
Application crash when processing malicious subtitle files, requiring restart of affected media applications.
If Mitigated
No impact if subtitle parsing is disabled or if applications don't process untrusted subtitle files.
🎯 Exploit Status
Requires attacker to supply malicious subtitle file to vulnerable application. No authentication bypass needed if application accepts subtitle files.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: GStreamer 1.26.2 or later
Vendor Advisory: https://gstreamer.freedesktop.org/security/
Restart Required: No
Instructions:
1. Check current GStreamer version. 2. Update to GStreamer 1.26.2 or later using your distribution's package manager. 3. For source installations, download and compile latest version from gstreamer.freedesktop.org.
🔧 Temporary Workarounds
Disable subparse plugin
LinuxRemove or disable the vulnerable subparse plugin to prevent subtitle parsing
gst-inspect-1.0 --plugin-filters=name=subparse
sudo rm /usr/lib/gstreamer-1.0/libgstsubparse.so
🧯 If You Can't Patch
- Implement input validation for subtitle files before processing
- Run GStreamer applications in sandboxed/containerized environments
🔍 How to Verify
Check if Vulnerable:
Check GStreamer version: gst-inspect-1.0 --version | grep 'GStreamer'Check Version:
gst-inspect-1.0 --versionVerify Fix Applied:
Verify version is 1.26.2 or later: gst-inspect-1.0 --version📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation fault when processing subtitle files
- GStreamer error logs mentioning subparse or subtitle parsing failures
Network Indicators:
- Unusual subtitle file downloads to media processing servers
SIEM Query:
source="application.log" AND ("segmentation fault" OR "NULL pointer") AND ("gstreamer" OR "subtitle")