CVE-2025-7797
📋 TL;DR
A null pointer dereference vulnerability in GPAC's DASH client allows remote attackers to cause denial of service by manipulating the base_init_url argument. This affects GPAC multimedia framework users who process DASH streams. The vulnerability can be triggered remotely without authentication.
💻 Affected Systems
- GPAC Multimedia Framework
📦 What is this software?
Gpac by Gpac
⚠️ Risk & Real-World Impact
Worst Case
Application crash leading to denial of service for media processing functionality
Likely Case
Service disruption when processing malicious DASH streams, potentially affecting media playback or streaming services
If Mitigated
Minimal impact with proper input validation and error handling in place
🎯 Exploit Status
Exploit code has been publicly disclosed and requires sending specially crafted DASH stream
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in commit 153ea314b6b053db17164f8bc3c7e1e460938eaa
Vendor Advisory: https://github.com/gpac/gpac/commit/153ea314b6b053db17164f8bc3c7e1e460938eaa
Restart Required: Yes
Instructions:
1. Update GPAC to version after 2.4 or apply commit 153ea314b6b053db17164f8bc3c7e1e460938eaa
2. Recompile GPAC from source if using custom build
3. Restart any services using GPAC
🔧 Temporary Workarounds
Input Validation Filter
allImplement input validation for DASH stream URLs before processing
# Implement custom validation in application code before calling gf_dash_download_init_segment
Process Isolation
linuxRun GPAC in isolated container or sandbox to limit crash impact
docker run --security-opt=no-new-privileges -it gpac-container
🧯 If You Can't Patch
- Implement network filtering to block suspicious DASH stream sources
- Deploy monitoring to detect and alert on GPAC process crashes
🔍 How to Verify
Check if Vulnerable:
Check GPAC version with 'gpac -version' and verify if version is 2.4 or earlierCheck Version:
gpac -version 2>&1 | head -1Verify Fix Applied:
Verify commit hash includes 153ea314b6b053db17164f8bc3c7e1e460938eaa or version is newer than 2.4📡 Detection & Monitoring
Log Indicators:
- GPAC process crashes
- Segmentation fault errors in system logs
- Abnormal termination of media processing services
Network Indicators:
- Unusual DASH stream requests with malformed URLs
- Repeated connection attempts to media processing endpoints
SIEM Query:
process_name:"gpac" AND (event_type:"crash" OR exit_code:139)