CVE-2022-28906
📋 TL;DR
This CVE describes a command injection vulnerability in TOTOLink N600R routers where an attacker can execute arbitrary commands via the langtype parameter. Attackers can gain full control of affected devices, potentially compromising entire networks. Only TOTOLink N600R routers with specific firmware versions are affected.
💻 Affected Systems
- TOTOLink N600R
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full device compromise leading to persistent backdoor installation, credential theft, network pivoting to internal systems, and participation in botnets.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as a foothold for further attacks.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access and proper network segmentation.
🎯 Exploit Status
Exploit requires HTTP POST request to vulnerable endpoint; no authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Consider upgrading to newer firmware if available from vendor.
🔧 Temporary Workarounds
Block Web Interface Access
linuxRestrict access to router web management interface from untrusted networks
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_NETWORK -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
Disable Remote Management
allTurn off remote management feature in router settings
🧯 If You Can't Patch
- Segment affected routers on isolated network VLAN
- Implement strict firewall rules to limit router management interface access
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at System Status > Firmware VersionCheck Version:
curl -s http://router-ip/ | grep -i firmwareVerify Fix Applied:
Test if langtype parameter accepts command injection by attempting safe payload like '$(echo test)'📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /setting/setLanguageCfg
- Commands with shell metacharacters in langtype parameter
Network Indicators:
- HTTP POST to /setting/setLanguageCfg with shell commands in payload
- Outbound connections from router to unexpected destinations
SIEM Query:
source="router-logs" AND uri="/setting/setLanguageCfg" AND (langtype="*$(*" OR langtype="*`*" OR langtype="*|*")