CVE-2024-53334
📋 TL;DR
CVE-2024-53334 is a buffer overflow vulnerability in the infostat.cgi component of TOTOLINK A810R routers. This allows remote attackers to execute arbitrary code or cause denial of service by sending specially crafted requests. Organizations using affected TOTOLINK A810R routers are at risk.
💻 Affected Systems
- TOTOLINK A810R
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete router compromise, network traffic interception, lateral movement to internal networks, and persistent backdoor installation.
Likely Case
Router crash causing denial of service, temporary network disruption, and potential credential theft if authentication bypass occurs.
If Mitigated
Limited to denial of service if proper network segmentation and input validation are implemented, with minimal impact on overall network operations.
🎯 Exploit Status
Proof of concept available on GitHub demonstrates exploitation. The vulnerability requires no authentication and has straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check TOTOLINK official website for firmware updates. 2. Download latest firmware for A810R model. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Reboot router after update completes.
🔧 Temporary Workarounds
Disable infostat.cgi access
linuxBlock access to the vulnerable CGI component via firewall rules or router configuration
iptables -A INPUT -p tcp --dport 80 -m string --string "infostat.cgi" --algo bm -j DROP
iptables -A INPUT -p tcp --dport 443 -m string --string "infostat.cgi" --algo bm -j DROP
Network segmentation
allIsolate affected routers in separate network segments with strict access controls
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure to trusted IP addresses only
- Monitor network traffic for exploitation attempts and implement intrusion detection rules
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface or using curl: curl -s http://router-ip/version.cgi | grep 'V4.1.2cu.5182_B20201026'Check Version:
curl -s http://[router-ip]/version.cgiVerify Fix Applied:
Verify firmware version has changed from vulnerable version and test infostat.cgi endpoint with safe payloads📡 Detection & Monitoring
Log Indicators:
- Multiple requests to infostat.cgi with long parameters
- Router crash/restart logs
- Unusual process execution in router logs
Network Indicators:
- HTTP requests to /cgi-bin/infostat.cgi with abnormally long parameters
- Traffic patterns suggesting buffer overflow attempts
SIEM Query:
source="router-logs" AND (uri="*infostat.cgi*" AND (content_length>1000 OR parameter_length>500))