CVE-2024-7212
📋 TL;DR
This critical vulnerability in TOTOLINK A7000R routers allows remote attackers to execute arbitrary code via a buffer overflow in the loginauth function when manipulating the password parameter. Attackers can exploit this without authentication to potentially take full control of affected devices. All users of TOTOLINK A7000R routers with firmware version 9.1.0u.6268_B20220504 are affected.
💻 Affected Systems
- TOTOLINK A7000R
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, enabling attackers to install persistent malware, pivot to internal networks, or create botnet nodes.
Likely Case
Remote code execution allowing attackers to modify device configuration, intercept network traffic, or disable the router entirely.
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, making exploitation trivial for attackers. The vendor has not responded to disclosure attempts.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
No official patch is available. Monitor TOTOLINK's website for firmware updates. If an update becomes available, download from official sources and flash via the router's web interface.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to the router's web interface by disabling remote management features.
Access router web interface > Advanced Settings > Remote Management > Disable
Network Segmentation
allIsolate affected routers in a separate VLAN with strict firewall rules limiting access.
🧯 If You Can't Patch
- Replace affected devices with models from vendors that provide timely security updates
- Implement network-based intrusion prevention systems (IPS) with rules to detect and block exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface: Login > System > Firmware Upgrade. If version is 9.1.0u.6268_B20220504, device is vulnerable.Check Version:
curl -k https://[router-ip]/cgi-bin/cstecgi.cgi?action=get_firmware_version (returns JSON with version info)Verify Fix Applied:
Verify firmware version has been updated to a version later than 9.1.0u.6268_B20220504. No official fixed version is currently available.📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts with long password strings
- Unusual POST requests to /cgi-bin/cstecgi.cgi with oversized password parameter
- System logs showing process crashes or restarts
Network Indicators:
- HTTP POST requests to /cgi-bin/cstecgi.cgi with password parameter exceeding normal length
- Traffic patterns suggesting exploitation attempts from external IPs
SIEM Query:
source="router_logs" AND (url="/cgi-bin/cstecgi.cgi" AND password_length>100) OR (process="httpd" AND event="crash")🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/TOTOLINK/A7000R/loginauth_password.md
- https://vuldb.com/?ctiid.272783
- https://vuldb.com/?id.272783
- https://vuldb.com/?submit.378312
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/TOTOLINK/A7000R/loginauth_password.md
- https://vuldb.com/?ctiid.272783
- https://vuldb.com/?id.272783
- https://vuldb.com/?submit.378312
