CVE-2025-7616
📋 TL;DR
A critical memory corruption vulnerability exists in the pthread_cond_destroy function of gmg137 snap7-rs library versions up to 1.142.1. This vulnerability allows attackers to potentially execute arbitrary code or cause denial of service. Systems using affected snap7-rs versions in their Public API are at risk.
💻 Affected Systems
- gmg137 snap7-rs
📦 What is this software?
Snap7 Rs by Gmg137
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Application crash or denial of service affecting industrial control systems using snap7-rs for PLC communication.
If Mitigated
Limited impact with proper memory protection mechanisms and exploit mitigations in place.
🎯 Exploit Status
Exploit has been publicly disclosed. Memory corruption vulnerabilities in threading libraries are often weaponized due to their reliability and impact.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://gitee.com/gmg137/snap7-rs/issues/ICBIOB
Restart Required: Yes
Instructions:
1. Monitor the official repository for patches. 2. Consider alternative snap7 implementations. 3. Apply workarounds until official fix is available.
🔧 Temporary Workarounds
Disable vulnerable functionality
allAvoid using pthread_cond_destroy in affected snap7-rs versions by modifying application code or using alternative synchronization mechanisms.
Memory protection hardening
linuxEnable ASLR, DEP, and other memory protection mechanisms to reduce exploit success probability.
echo 2 > /proc/sys/kernel/randomize_va_space
sysctl -w kernel.exec-shield=1
🧯 If You Can't Patch
- Network segmentation: Isolate systems using vulnerable snap7-rs from untrusted networks.
- Application firewalling: Restrict network access to only necessary PLC communication ports.
🔍 How to Verify
Check if Vulnerable:
Check snap7-rs version in your project dependencies or installed packages. Versions ≤1.142.1 are vulnerable.Check Version:
cargo tree | grep snap7-rs OR check Cargo.toml for snap7-rs versionVerify Fix Applied:
Verify snap7-rs version is >1.142.1 after update. Test pthread_cond_destroy functionality.📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory corruption errors
- Unexpected pthread_cond_destroy calls
- Segmentation faults in snap7-rs processes
Network Indicators:
- Unusual traffic to snap7-rs ports (typically 102 for S7)
- Exploit kit patterns targeting memory corruption
SIEM Query:
process_name:"snap7" AND (event_type:crash OR error_message:"segmentation fault" OR error_message:"memory corruption")