CVE-2024-7174
📋 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 setdeviceName function. This affects all users running the vulnerable firmware version, potentially giving attackers full control of affected devices. The vulnerability is remotely exploitable without authentication.
💻 Affected Systems
- TOTOLINK A3600R
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, creation of persistent backdoors, lateral movement to internal networks, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify device configuration, intercept network 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
Restart Required: Yes
Instructions:
No official patch available. Vendor was contacted but did not respond. 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 Web Management Interface
allTurn off the web management interface if not required
Check router configuration for web interface disable option
🧯 If You Can't Patch
- Isolate affected routers in a separate VLAN with strict firewall rules
- Implement network monitoring for exploitation attempts and anomalous traffic patterns
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at http://[router-ip]/ or using telnet/ssh if available. Look for version 4.1.2cu.5182_B20201102.Check Version:
curl -s http://[router-ip]/ | grep -i firmware || telnet [router-ip] 23Verify Fix Applied:
Verify firmware has been updated to a version newer than 4.1.2cu.5182_B20201102. No official fix exists, so verification requires vendor confirmation.📡 Detection & Monitoring
Log Indicators:
- Multiple requests to /cgi-bin/cstecgi.cgi with long deviceMac/deviceName parameters
- Unusual process execution or system modifications
Network Indicators:
- HTTP POST requests to /cgi-bin/cstecgi.cgi with oversized parameters
- Unusual outbound connections from router
SIEM Query:
source="router_logs" AND uri="/cgi-bin/cstecgi.cgi" AND (param_length>100 OR status_code=500)🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/TOTOLINK/A3600R/setDeviceName.md
- https://vuldb.com/?ctiid.272595
- https://vuldb.com/?id.272595
- https://vuldb.com/?submit.378041
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/TOTOLINK/A3600R/setDeviceName.md
- https://vuldb.com/?ctiid.272595
- https://vuldb.com/?id.272595
- https://vuldb.com/?submit.378041
