CVE-2024-7908
📋 TL;DR
This critical vulnerability in TOTOLINK EX1200L routers allows remote attackers to execute arbitrary code via a stack-based buffer overflow in the setDefResponse function. Attackers can exploit this by sending specially crafted requests to the web interface, potentially taking full control of affected devices. All users running the vulnerable firmware version are at risk.
💻 Affected Systems
- TOTOLINK EX1200L
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, lateral movement to other devices, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify device configuration, steal credentials, or use the device as a pivot point for further attacks.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation prevents lateral movement.
🎯 Exploit Status
Public exploit code is available on GitHub, making exploitation trivial for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Vendor was contacted but did not respond. Consider replacing affected devices with supported models.
🔧 Temporary Workarounds
Network Isolation
allPlace affected devices in isolated VLANs with strict firewall rules to prevent external and lateral access.
Access Control
allRestrict access to the web management interface using firewall rules and disable remote administration.
🧯 If You Can't Patch
- Immediately disconnect affected devices from the internet and place them behind strict firewalls
- Replace affected devices with supported models from vendors that provide security updates
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface at http://[router-ip]/ or using SSH/Telnet if enabled. Vulnerable if version is 9.3.5u.6146_B20201023.Check Version:
curl -s http://[router-ip]/cgi-bin/cstecgi.cgi?getFirmwareVersion or check web interfaceVerify Fix Applied:
No fix available to verify. Consider device replacement as primary remediation.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /cgi-bin/cstecgi.cgi with long IpAddress parameters
- Device reboots or configuration changes not initiated by administrators
Network Indicators:
- Traffic to router web interface from unexpected sources
- Outbound connections from router to suspicious IPs
SIEM Query:
source_ip=* AND dest_port=80 AND uri_path="/cgi-bin/cstecgi.cgi" AND http_method=POST AND content_length>1000