CVE-2023-46427
📋 TL;DR
A null pointer dereference vulnerability in gpac's DASH client component allows remote attackers to execute arbitrary code, cause denial of service, or access sensitive information. This affects systems running vulnerable versions of gpac that process DASH media streams. Attackers can exploit this without authentication by sending specially crafted media content.
💻 Affected Systems
- gpac
📦 What is this software?
Gpac by Gpac
⚠️ Risk & Real-World Impact
Worst Case
Full remote code execution leading to complete system compromise, data exfiltration, and persistent backdoor installation.
Likely Case
Denial of service causing application crashes and service disruption, potentially with memory corruption leading to information disclosure.
If Mitigated
Application crashes with limited impact if proper sandboxing, privilege separation, and input validation are in place.
🎯 Exploit Status
Exploitation requires crafting malicious DASH media content; the null pointer dereference could lead to memory corruption enabling RCE.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check latest gpac releases after the vulnerability disclosure
Vendor Advisory: https://github.com/gpac/gpac/issues/2641
Restart Required: Yes
Instructions:
1. Check current gpac version. 2. Update to latest patched version from official gpac repository. 3. Restart any services using gpac. 4. Recompile if using source distribution.
🔧 Temporary Workarounds
Disable DASH client functionality
allPrevent processing of DASH media streams if not required
Configure applications to avoid using gf_dash_setup_period component
Network filtering
allBlock or filter DASH media streams at network perimeter
Implement WAF rules to detect/sanitize DASH content
Use network segmentation to isolate media processing systems
🧯 If You Can't Patch
- Implement strict network segmentation to isolate media processing systems
- Deploy application sandboxing and privilege reduction for gpac processes
🔍 How to Verify
Check if Vulnerable:
Check if gpac version matches affected development version; test with known vulnerable DASH streams if availableCheck Version:
gpac -version 2>/dev/null || mp4box -version 2>/dev/null || strings $(which gpac) | grep -i versionVerify Fix Applied:
Update to latest version and verify the gf_dash_setup_period component handles null pointers correctly📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults
- Memory access violation errors
- Unexpected termination of gpac processes
Network Indicators:
- Unusual DASH media stream requests
- Traffic patterns targeting media processing endpoints
SIEM Query:
process:gpac AND (event_id:1000 OR signal:SIGSEGV) OR network:dash AND destination_port:(media_ports)