CVE-2023-4679
📋 TL;DR
A use-after-free vulnerability in GPAC's gf_filterpacket_del function can cause double-free conditions leading to application crashes. This affects systems running GPAC version 2.3-DEV-revrelease when processing multimedia content. The vulnerability could potentially be exploited to cause denial of service.
💻 Affected Systems
- GPAC (Multimedia Framework)
📦 What is this software?
Gpac by Gpac
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution if combined with other vulnerabilities, though unlikely given the CVSS score and nature of the bug.
Likely Case
Application crash leading to denial of service when processing malicious multimedia files.
If Mitigated
Minimal impact with proper input validation and sandboxing in place.
🎯 Exploit Status
Exploitation requires crafting malicious multimedia files to trigger the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in commit b68b3f0bf5c366e003221d78fd663a1d5514a876
Vendor Advisory: https://github.com/gpac/gpac/commit/b68b3f0bf5c366e003221d78fd663a1d5514a876
Restart Required: Yes
Instructions:
1. Update GPAC to latest version or apply the specific commit. 2. Recompile from source if using development version. 3. Restart any services using GPAC.
🔧 Temporary Workarounds
Input Validation
allImplement strict input validation for multimedia files before processing with GPAC.
Sandbox Execution
allRun GPAC in a sandboxed environment to limit impact of potential crashes.
🧯 If You Can't Patch
- Restrict GPAC to processing only trusted, verified multimedia files.
- Implement monitoring for application crashes and investigate any anomalies.
🔍 How to Verify
Check if Vulnerable:
Check GPAC version with 'gpac -version' or verify if using the specific vulnerable commit.Check Version:
gpac -versionVerify Fix Applied:
Confirm GPAC version is updated beyond the vulnerable commit or check for the fix in the source code.📡 Detection & Monitoring
Log Indicators:
- GPAC application crashes
- Segmentation faults in GPAC processes
- Memory corruption errors
Network Indicators:
- Unusual multimedia file uploads to systems using GPAC
SIEM Query:
Process:gpac AND (EventID:1000 OR EventID:1001) OR Error:segmentation fault