CVE-2024-41319
📋 TL;DR
This CVE describes a command injection vulnerability in TOTOLINK A6000R routers that allows attackers to execute arbitrary commands on the device via the cmd parameter in the webcmd function. Attackers can gain full control of affected routers, potentially compromising network security and connected devices. Users of TOTOLINK A6000R routers with firmware version V1.0.1-B20201211.2000 are affected.
💻 Affected Systems
- TOTOLINK A6000R
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of router with persistent backdoor installation, network traffic interception, credential theft, and lateral movement to connected devices.
Likely Case
Router takeover leading to DNS hijacking, credential harvesting, and network reconnaissance.
If Mitigated
Limited impact if router is behind firewall with restricted web interface access and proper network segmentation.
🎯 Exploit Status
Public proof-of-concept available in GitHub repository; exploitation requires web interface access but no authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check TOTOLINK website for firmware updates
2. Download latest firmware for A6000R
3. Access router web interface
4. Navigate to firmware upgrade section
5. Upload and apply new firmware
6. Reboot router
🔧 Temporary Workarounds
Disable Web Interface Access
linuxBlock external access to router web interface
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Change Default Ports
allModify web interface to use non-standard ports
🧯 If You Can't Patch
- Place router behind firewall with strict inbound rules blocking web interface ports
- Implement network segmentation to isolate router from critical systems
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface under System Status or About pageCheck Version:
curl -s http://router-ip/ | grep -i versionVerify Fix Applied:
Verify firmware version is different from V1.0.1-B20201211.2000📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to webcmd endpoint
- Commands containing shell metacharacters in web logs
Network Indicators:
- Unexpected outbound connections from router
- DNS queries to suspicious domains
SIEM Query:
source="router.log" AND (uri="/cgi-bin/webcmd" OR cmd=*;* OR cmd=*|* OR cmd=*`*)🔗 References
- https://gist.github.com/yanggao017/40efb889800ae2691c38086ebf80c037
- https://github.com/yanggao017/vuln/blob/main/TOTOLINK/A6000R/CI_7_webcmd/README.md
- https://gist.github.com/yanggao017/40efb889800ae2691c38086ebf80c037
- https://github.com/yanggao017/vuln/blob/main/TOTOLINK/A6000R/CI_7_webcmd/README.md
