CVE-2014-6440
📋 TL;DR
CVE-2014-6440 is a heap-based buffer overflow vulnerability in VideoLAN VLC media player's transcode module. It allows remote attackers to execute arbitrary code or cause denial of service by tricking users into opening specially crafted media files. All users running vulnerable VLC versions are affected.
💻 Affected Systems
- VideoLAN VLC media player
📦 What is this software?
Vlc by Videolan
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with full system compromise, allowing attackers to install malware, steal data, or create persistent backdoors.
Likely Case
Application crash (denial of service) or limited code execution in the context of the current user.
If Mitigated
No impact if patched version is installed or if vulnerable version is not used to open untrusted media files.
🎯 Exploit Status
Exploit requires user to open malicious media file. Public proof-of-concept code exists demonstrating the heap overflow.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.1.5 and later
Vendor Advisory: http://www.videolan.org/developers/vlc-branch/NEWS
Restart Required: Yes
Instructions:
1. Download VLC 2.1.5 or later from videolan.org. 2. Uninstall old VLC version. 3. Install new version. 4. Restart system if VLC was running during update.
🔧 Temporary Workarounds
Disable transcode module
allRemove or disable the vulnerable transcode module to prevent exploitation
On Linux: rm /usr/lib/vlc/plugins/codec/libtranscode_plugin.so
On Windows: Delete transcode_plugin.dll from VLC plugins folder
Restrict file associations
allPrevent VLC from automatically opening media files
On Windows: Control Panel > Default Programs > Set Associations
On Linux: Update mimeapps.list to remove VLC associations
🧯 If You Can't Patch
- Block execution of VLC player via application whitelisting
- Implement network segmentation to limit damage if exploitation occurs
🔍 How to Verify
Check if Vulnerable:
Check VLC version: Open VLC, go to Help > About (Windows/Linux) or VLC > About VLC (macOS)Check Version:
vlc --version | head -1 (Linux/macOS) or check Help > About on WindowsVerify Fix Applied:
Verify version is 2.1.5 or higher using the same About dialog📡 Detection & Monitoring
Log Indicators:
- VLC crash logs with transcode module references
- Application error events in Windows Event Viewer
Network Indicators:
- Unusual outbound connections from VLC process
- Downloads of media files from suspicious sources
SIEM Query:
process_name:"vlc.exe" AND (event_type:"crash" OR event_type:"application_error")🔗 References
- http://billblough.net/blog/2015/03/04/cve-2014-6440-heap-overflow-in-vlc-transcode-module/
- http://seclists.org/oss-sec/2015/q1/751
- http://www.securityfocus.com/bid/72950
- http://www.videolan.org/developers/vlc-branch/NEWS
- https://security.gentoo.org/glsa/201603-08
- http://billblough.net/blog/2015/03/04/cve-2014-6440-heap-overflow-in-vlc-transcode-module/
- http://seclists.org/oss-sec/2015/q1/751
- http://www.securityfocus.com/bid/72950
- http://www.videolan.org/developers/vlc-branch/NEWS
- https://security.gentoo.org/glsa/201603-08
