CVE-2020-6016
📋 TL;DR
This vulnerability in Valve's Game Networking Sockets library allows remote attackers to execute arbitrary code by sending specially crafted unreliable network segments. It affects any application using vulnerable versions of the library for network communication, potentially impacting multiplayer games and services built on this technology.
💻 Affected Systems
- Valve Game Networking Sockets library
- Applications using vulnerable versions of the library
📦 What is this software?
Game Networking Sockets by Valvesoftware
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with the privileges of the affected application, potentially leading to complete system compromise.
Likely Case
Application crash (denial of service) or memory corruption leading to unstable behavior.
If Mitigated
No impact if patched or if network controls prevent malicious traffic.
🎯 Exploit Status
Technical details and proof-of-concept are publicly available in research publications.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v1.2.0 and later
Vendor Advisory: https://github.com/ValveSoftware/GameNetworkingSockets/commit/e0c86dcb9139771db3db0cfdb1fb8bef0af19c43
Restart Required: Yes
Instructions:
1. Update Game Networking Sockets library to version 1.2.0 or later. 2. Rebuild any applications using the library. 3. Restart affected services or applications.
🔧 Temporary Workarounds
Network segmentation
allIsolate vulnerable systems from untrusted networks to prevent remote exploitation.
Application firewalling
allRestrict network access to only trusted sources for applications using the vulnerable library.
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure
- Monitor for abnormal application crashes or memory usage patterns
🔍 How to Verify
Check if Vulnerable:
Check if Game Networking Sockets library version is below 1.2.0 in application dependencies or linked libraries.Check Version:
Check library version in build configuration or dependency files (varies by application)Verify Fix Applied:
Verify library version is 1.2.0 or higher and that applications have been rebuilt with the updated library.📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory corruption errors
- Unexpected termination of network services
Network Indicators:
- Unusual network traffic patterns to applications using Game Networking Sockets
SIEM Query:
Search for application crashes or memory access violations in system logs related to affected applications🔗 References
- https://github.com/ValveSoftware/GameNetworkingSockets/commit/e0c86dcb9139771db3db0cfdb1fb8bef0af19c43
- https://research.checkpoint.com/2020/game-on-finding-vulnerabilities-in-valves-steam-sockets/
- https://github.com/ValveSoftware/GameNetworkingSockets/commit/e0c86dcb9139771db3db0cfdb1fb8bef0af19c43
- https://research.checkpoint.com/2020/game-on-finding-vulnerabilities-in-valves-steam-sockets/
