CVE-2024-7184
📋 TL;DR
This critical vulnerability in TOTOLINK A3600R routers allows remote attackers to execute arbitrary code via buffer overflow in the setUrlFilterRules function. Attackers can exploit this by sending specially crafted requests to the /cgi-bin/cstecgi.cgi endpoint, potentially gaining full control of affected devices. All users running vulnerable firmware versions are at risk.
💻 Affected Systems
- TOTOLINK A3600R
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, credential theft, lateral movement within networks, and participation in botnets.
Likely Case
Remote code execution allowing attackers to modify device settings, intercept network traffic, or use the device as an attack platform.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Exploit details are publicly available on GitHub. The vulnerability requires no authentication and has simple exploitation vectors.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
No official patch available. Contact TOTOLINK support for firmware updates. Check vendor website periodically for security updates.
🔧 Temporary Workarounds
Disable Remote Management
allDisable web management interface from WAN/Internet access
Access router admin panel > Advanced Settings > System Tools > Remote Management > Disable
Network Segmentation
allIsolate affected routers in separate VLAN with restricted access
🧯 If You Can't Patch
- Replace affected devices with supported models from different vendors
- Implement strict network access controls to limit exposure to the management interface
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface: Login > Advanced Settings > System Tools > Firmware UpgradeCheck Version:
curl -s http://router-ip/cgi-bin/cstecgi.cgi | grep -i versionVerify Fix Applied:
Verify firmware version is newer than 4.1.2cu.5182_B20201102📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /cgi-bin/cstecgi.cgi with long url parameter values
- Multiple failed buffer overflow attempts in system logs
Network Indicators:
- Unusual outbound connections from router to unknown IPs
- Spike in traffic to router management interface
SIEM Query:
source="router_logs" AND (uri="/cgi-bin/cstecgi.cgi" AND method="POST" AND url_parameter_length>1000)🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/TOTOLINK/A3600R/setUrlFilterRules.md
- https://vuldb.com/?ctiid.272605
- https://vuldb.com/?id.272605
- https://vuldb.com/?submit.378053
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/TOTOLINK/A3600R/setUrlFilterRules.md
- https://vuldb.com/?ctiid.272605
- https://vuldb.com/?id.272605
- https://vuldb.com/?submit.378053
