CVE-2025-14673
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code or cause denial of service via a heap-based buffer overflow in the snap7-rs library's S7Client::as_ct_write function. It affects systems using snap7-rs up to version 1.142.1 for industrial control system communication. The exploit is publicly available and can be triggered remotely.
💻 Affected Systems
- 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 disruption of industrial control processes
Likely Case
Denial of service causing industrial control system communication failures and process interruptions
If Mitigated
Limited impact if network segmentation and access controls prevent external exploitation
🎯 Exploit Status
Public exploit available, remote exploitation without authentication, making weaponization likely
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.143.0 or later
Vendor Advisory: https://gitee.com/gmg137/snap7-rs/issues/ID2H74
Restart Required: Yes
Instructions:
1. Update snap7-rs dependency to version 1.143.0 or later in Cargo.toml. 2. Run 'cargo update'. 3. Rebuild and redeploy affected applications. 4. Restart services using the library.
🔧 Temporary Workarounds
Network Segmentation
allIsolate systems using snap7-rs from untrusted networks
Access Control Lists
linuxRestrict network access to snap7-rs services to trusted IPs only
iptables -A INPUT -p tcp --dport 102 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 102 -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate vulnerable systems
- Deploy intrusion prevention systems with buffer overflow detection rules
🔍 How to Verify
Check if Vulnerable:
Check Cargo.toml or Cargo.lock for snap7-rs version <=1.142.1Check Version:
grep snap7-rs Cargo.toml || grep snap7-rs Cargo.lockVerify Fix Applied:
Verify snap7-rs version is >=1.143.0 in dependencies and rebuild application📡 Detection & Monitoring
Log Indicators:
- Abnormal process crashes
- Memory access violation errors
- Unusual network connections to port 102
Network Indicators:
- Malformed S7 packets to port 102
- Unexpected traffic patterns to industrial control systems
SIEM Query:
source="network_traffic" dest_port=102 AND (payload_size>normal OR malformed_packet_detected)