CVE-2022-26188
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary commands on TOTOLINK N600R routers via the NTPSyncWithHost setting. Attackers can gain full control of affected devices without authentication. Only TOTOLINK N600R routers running specific vulnerable firmware are affected.
💻 Affected Systems
- TOTOLINK N600R
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to install persistent backdoors, pivot to internal networks, intercept traffic, or use device in botnets.
Likely Case
Remote code execution leading to device takeover, credential theft, and network reconnaissance.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access and proper network segmentation.
🎯 Exploit Status
Public exploit details available in referenced blog posts. Simple HTTP POST request with command injection payload.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not found
Restart Required: No
Instructions:
No official patch available. Check TOTOLINK website for firmware updates. If update exists, download from vendor portal and flash via web interface.
🔧 Temporary Workarounds
Disable WAN access to web interface
linuxBlock external access to router management interface on firewall
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Change default admin password
allWhile exploit is unauthenticated, changing credentials limits other attack vectors
🧯 If You Can't Patch
- Isolate router on separate VLAN with strict firewall rules
- Implement network monitoring for suspicious HTTP requests to /setting/NTPSyncWithHost
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface under System Status or About pageCheck Version:
curl -s http://router-ip/cgi-bin/luci/ | grep -i versionVerify Fix Applied:
Verify firmware version is newer than V4.3.0cu.7570_B20200620📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /setting/NTPSyncWithHost with shell metacharacters
- Unusual command execution in router logs
Network Indicators:
- HTTP traffic to router IP on port 80/443 with suspicious payloads in POST data
SIEM Query:
source="router_logs" AND uri="/setting/NTPSyncWithHost" AND (payload="|" OR payload=";" OR payload="`" OR payload="$")