CVE-2024-42966
📋 TL;DR
This vulnerability allows unauthenticated attackers to retrieve the apmib configuration file containing administrative credentials from TOTOLINK N350RT routers via a crafted request to /cgi-bin/ExportSettings.sh. Attackers can gain full administrative access to affected routers, potentially compromising network security. All users of affected TOTOLINK N350RT routers with vulnerable firmware are at risk.
💻 Affected Systems
- TOTOLINK N350RT
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain administrative credentials, take full control of the router, intercept all network traffic, deploy malware to connected devices, and use the router as a pivot point for attacking internal networks.
Likely Case
Attackers obtain administrative credentials and reconfigure the router for malicious purposes such as DNS hijacking, traffic interception, or creating a persistent backdoor.
If Mitigated
With proper network segmentation and access controls, impact is limited to the router itself rather than the entire network.
🎯 Exploit Status
Exploitation requires only a simple HTTP request to the vulnerable endpoint. Public proof-of-concept documentation exists.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
Check TOTOLINK website for firmware updates. If available, download latest firmware and upload via router web interface under System Tools > Firmware Upgrade.
🔧 Temporary Workarounds
Block Access to ExportSettings.sh
linuxUse router firewall rules to block access to the vulnerable endpoint
iptables -A INPUT -p tcp --dport 80 -m string --string "ExportSettings.sh" --algo bm -j DROP
iptables -A INPUT -p tcp --dport 443 -m string --string "ExportSettings.sh" --algo bm -j DROP
Disable Web Management Interface
allDisable remote web management if not required
Access router web interface > Advanced > Remote Management > Disable
🧯 If You Can't Patch
- Isolate affected routers in separate VLAN with strict firewall rules
- Change administrative credentials and monitor for unauthorized access attempts
🔍 How to Verify
Check if Vulnerable:
Send HTTP GET request to http://[router-ip]/cgi-bin/ExportSettings.sh and check if configuration file is returnedCheck Version:
Check router web interface > Status > Device Info or login via SSH/Telnet and run 'cat /proc/version'Verify Fix Applied:
Attempt the same request after applying fixes - should return error or be blocked📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /cgi-bin/ExportSettings.sh
- Unauthorized configuration export attempts
- Multiple failed login attempts followed by successful login
Network Indicators:
- HTTP GET requests to ExportSettings.sh endpoint
- Unusual traffic patterns from router to external IPs
SIEM Query:
source="router_logs" AND (uri="/cgi-bin/ExportSettings.sh" OR method="GET" AND uri CONTAINS "ExportSettings")