CVE-2025-15247
📋 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::download function. It affects systems using gmg137's snap7-rs library up to commit 153d3e8c16decd7271e2a5b2e3da4d6f68589424. The exploit is publicly available and can be executed remotely without authentication.
💻 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
Denial of service causing application crashes or system instability.
If Mitigated
Limited impact if network segmentation and strict access controls prevent exploitation attempts.
🎯 Exploit Status
Public exploit available through the issue report. Remote exploitation without authentication makes this easily weaponizable.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown - project has not responded to vulnerability report
Vendor Advisory: None available
Restart Required: Yes
Instructions:
No official patch available. Consider switching to alternative S7 libraries or implementing workarounds.
🔧 Temporary Workarounds
Network Segmentation
allIsolate systems using snap7-rs from untrusted networks and internet access
Application Firewall Rules
allBlock or restrict S7 protocol traffic to/from affected systems
iptables -A INPUT -p tcp --dport 102 -j DROP
netsh advfirewall firewall add rule name="Block S7" dir=in action=block protocol=TCP localport=102
🧯 If You Can't Patch
- Implement strict network access controls to limit S7 traffic to trusted sources only
- Deploy intrusion detection systems to monitor for exploitation attempts and buffer overflow patterns
🔍 How to Verify
Check if Vulnerable:
Check if your application uses snap7-rs library and verify the commit hash is 153d3e8c16decd7271e2a5b2e3da4d6f68589424 or earlierCheck Version:
Check Cargo.toml or project dependencies for snap7-rs version/referenceVerify Fix Applied:
No official fix available to verify. Monitor project repository for updates.📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory access violations
- Unusual S7 protocol traffic patterns
- Heap corruption errors in application logs
Network Indicators:
- Malformed S7 packets targeting port 102
- Unexpected S7 download requests
- Traffic patterns matching known exploit signatures
SIEM Query:
source="*" ("snap7" AND ("crash" OR "overflow" OR "segmentation fault")) OR (dest_port=102 AND packet_size>normal_threshold)