CVE-2024-7217
📋 TL;DR
This critical vulnerability in TOTOLINK CA300-PoE routers allows remote attackers to execute arbitrary code via a buffer overflow in the login authentication function. Attackers can exploit this by sending specially crafted password parameters to the vulnerable CGI endpoint. All users of affected TOTOLINK CA300-PoE routers are at risk.
💻 Affected Systems
- TOTOLINK CA300-PoE
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, lateral movement to internal networks, and persistent backdoor installation.
Likely Case
Device takeover enabling network traffic interception, credential theft, and use as a pivot point for further attacks.
If Mitigated
Denial of service or device crash if exploit fails, but proper controls should prevent exploitation entirely.
🎯 Exploit Status
Public exploit code is available on GitHub, making exploitation straightforward for attackers with basic skills.
🛠️ 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. Monitor TOTOLINK website for firmware updates and apply immediately when released.
🔧 Temporary Workarounds
Network Segmentation
allIsolate affected devices from internet and critical internal networks
Access Control Lists
linuxRestrict access to vulnerable CGI endpoint using firewall rules
iptables -A INPUT -p tcp --dport 80 -m string --string "/cgi-bin/cstecgi.cgi" --algo bm -j DROP
🧯 If You Can't Patch
- Replace affected devices with secure alternatives from different vendors
- Implement strict network monitoring and intrusion detection for traffic to/from affected devices
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or SSH: System Information > Firmware VersionCheck Version:
curl -s http://device-ip/cgi-bin/cstecgi.cgi | grep -i versionVerify Fix Applied:
Verify firmware version is updated beyond 6.2c.884 and test with known exploit payloads📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /cgi-bin/cstecgi.cgi with long password parameters
- Device crash/restart logs
- Failed authentication attempts with oversized inputs
Network Indicators:
- HTTP POST requests to /cgi-bin/cstecgi.cgi with password parameter exceeding normal length
- Unusual outbound connections from router
SIEM Query:
source="router_logs" AND (uri_path="/cgi-bin/cstecgi.cgi" AND http_method="POST" AND content_length>1000)🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/TOTOLINK/CA300-PoE/loginauth_password.md
- https://vuldb.com/?ctiid.272788
- https://vuldb.com/?id.272788
- https://vuldb.com/?submit.378333
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/TOTOLINK/CA300-PoE/loginauth_password.md
- https://vuldb.com/?ctiid.272788
- https://vuldb.com/?id.272788
- https://vuldb.com/?submit.378333
