CVE-2024-7156
📋 TL;DR
This vulnerability in TOTOLINK A3700R routers allows remote attackers to access sensitive configuration information through the ExportSettings.sh CGI script. It affects users of TOTOLINK A3700R firmware version 9.1.2u.5822_B20200513. The information disclosure could expose network configurations and credentials.
💻 Affected Systems
- TOTOLINK A3700R
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers obtain router configuration including admin credentials, Wi-Fi passwords, and network topology, enabling full network compromise.
Likely Case
Attackers access router configuration files containing sensitive network information and potentially administrative credentials.
If Mitigated
Information disclosure limited to non-sensitive configuration data if proper access controls and network segmentation are implemented.
🎯 Exploit Status
Exploit code is publicly available on GitHub. The vendor did not respond to disclosure attempts.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Consider upgrading to newer firmware versions if available from vendor.
🔧 Temporary Workarounds
Disable CGI Script Access
linuxBlock access to the vulnerable /cgi-bin/ExportSettings.sh endpoint
iptables -A INPUT -p tcp --dport 80 -m string --string "/cgi-bin/ExportSettings.sh" --algo bm -j DROP
iptables -A INPUT -p tcp --dport 443 -m string --string "/cgi-bin/ExportSettings.sh" --algo bm -j DROP
Network Segmentation
allIsolate router management interface from untrusted networks
🧯 If You Can't Patch
- Implement strict firewall rules to block external access to router management interface
- Change all default credentials and monitor for unauthorized configuration exports
🔍 How to Verify
Check if Vulnerable:
Test if http://[router-ip]/cgi-bin/ExportSettings.sh returns configuration data without authenticationCheck Version:
Check router web interface or use: curl -s http://[router-ip]/ | grep -i firmwareVerify Fix Applied:
Verify the endpoint no longer returns configuration data or returns access denied📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /cgi-bin/ExportSettings.sh
- Large configuration file downloads from router
Network Indicators:
- HTTP GET requests to ExportSettings.sh endpoint
- Unusual traffic patterns to router management interface
SIEM Query:
source="router_logs" AND uri="/cgi-bin/ExportSettings.sh"🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/TOTOLINK/A3700R/ExportSettings.md
- https://vuldb.com/?ctiid.272570
- https://vuldb.com/?id.272570
- https://vuldb.com/?submit.377473
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/TOTOLINK/A3700R/ExportSettings.md
- https://vuldb.com/?ctiid.272570
- https://vuldb.com/?id.272570
- https://vuldb.com/?submit.377473
