CVE-2024-7178
📋 TL;DR
A critical buffer overflow vulnerability in TOTOLINK A3600R routers allows remote attackers to execute arbitrary code by sending specially crafted requests to the setMacQos function. This affects TOTOLINK A3600R routers running firmware version 4.1.2cu.5182_B20201102. Attackers can exploit this without authentication to potentially take full control of affected devices.
💻 Affected Systems
- TOTOLINK A3600R
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, lateral movement to internal networks, persistent backdoor installation, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to disrupt network services, intercept traffic, or use the device as a pivot point for further attacks.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering, though internal exploitation remains possible.
🎯 Exploit Status
Public exploit code is available on GitHub. The vulnerability requires no authentication and has straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available - vendor did not respond to disclosure
Restart Required: Yes
Instructions:
No official patch available. Consider replacing affected devices or implementing strict network controls.
🔧 Temporary Workarounds
Network Access Control
linuxBlock access to the vulnerable CGI endpoint from untrusted networks
iptables -A INPUT -p tcp --dport 80 -m string --string "/cgi-bin/cstecgi.cgi" --algo bm -j DROP
iptables -A INPUT -p tcp --dport 443 -m string --string "/cgi-bin/cstecgi.cgi" --algo bm -j DROP
Disable Remote Management
allTurn off WAN-side administration access if enabled
🧯 If You Can't Patch
- Isolate affected routers in a dedicated VLAN with strict firewall rules preventing outbound connections
- Implement network segmentation to prevent lateral movement from compromised routers
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at 192.168.1.1 or using command: curl -s http://router-ip/ | grep -i firmwareCheck Version:
curl -s http://192.168.1.1/ | grep -o 'Firmware Version:[^<]*' || echo 'Check web interface at router IP'Verify Fix Applied:
No official fix available. Verify workarounds by testing that /cgi-bin/cstecgi.cgi endpoint is inaccessible.📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /cgi-bin/cstecgi.cgi with long parameter values
- Unusual process execution or memory errors in router logs
Network Indicators:
- HTTP POST requests to /cgi-bin/cstecgi.cgi with abnormally long priority or macAddress parameters
- Sudden outbound connections from router to unknown IPs
SIEM Query:
source="router_logs" AND (url="/cgi-bin/cstecgi.cgi" AND (param_length>100 OR status_code=500))🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/TOTOLINK/A3600R/setMacQos.md
- https://vuldb.com/?ctiid.272599
- https://vuldb.com/?id.272599
- https://vuldb.com/?submit.378045
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/TOTOLINK/A3600R/setMacQos.md
- https://vuldb.com/?ctiid.272599
- https://vuldb.com/?id.272599
- https://vuldb.com/?submit.378045
