CVE-2021-29003
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary commands on Genexis PLATINUM 4410 routers by injecting shell metacharacters into the sys_config_valid.xgi endpoint. Attackers can gain full control of affected devices without authentication. This affects all users of vulnerable Genexis router models.
💻 Affected Systems
- Genexis PLATINUM 4410
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover allowing attackers to install persistent backdoors, intercept all network traffic, pivot to internal networks, and use the device for botnet activities.
Likely Case
Remote code execution leading to device compromise, credential theft, DNS hijacking, and network surveillance.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Simple HTTP request with command injection payload; multiple public exploit examples exist.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not publicly available
Restart Required: No
Instructions:
Contact Genexis support for firmware updates. Check vendor website for security advisories.
🔧 Temporary Workarounds
Block Management Interface Access
linuxRestrict access to router management interface using firewall rules
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Disable Remote Management
allTurn off remote administration features in router settings
🧯 If You Can't Patch
- Segment affected routers on isolated network VLANs
- Implement strict network ACLs to block all inbound traffic to router management interfaces
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface or via SSH: cat /etc/versionCheck Version:
ssh admin@router-ip 'cat /etc/version' or check web interfaceVerify Fix Applied:
Verify firmware version is updated beyond 2.1 P4410-V2-1.28📡 Detection & Monitoring
Log Indicators:
- HTTP requests to sys_config_valid.xgi with shell metacharacters
- Unusual telnetd service startup
- Suspicious command execution in system logs
Network Indicators:
- HTTP requests containing %60telnetd%20%26%60 or similar shell injection patterns
- Unexpected telnet connections to router
SIEM Query:
http.url:*sys_config_valid.xgi* AND (http.uri:*%60* OR http.uri:*$(* OR http.uri:*`*)🔗 References
- http://packetstormsecurity.com/files/162174/Genexis-PLATINUM-4410-2.1-P4410-V2-1.28-Remote-Command-Execution.html
- https://hackerworld.home.blog/2021/03/19/rce-in-genexis-router/
- http://packetstormsecurity.com/files/162174/Genexis-PLATINUM-4410-2.1-P4410-V2-1.28-Remote-Command-Execution.html
- https://hackerworld.home.blog/2021/03/19/rce-in-genexis-router/
