CVE-2022-30105
📋 TL;DR
Belkin N300 routers running firmware version 1.00.08 contain multiple remote command injection vulnerabilities in the /setting_hidden.asp script. Attackers can execute arbitrary OS commands with root privileges by sending specially crafted POST requests to vulnerable parameters. All users of affected Belkin N300 routers are at risk.
💻 Affected Systems
- Belkin N300 Wireless Router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to install persistent malware, intercept all network traffic, pivot to internal networks, or brick the device.
Likely Case
Router takeover enabling traffic interception, DNS hijacking, credential theft, and lateral movement to connected devices.
If Mitigated
Limited impact if device is behind firewall with strict inbound rules and network segmentation.
🎯 Exploit Status
Exploitation requires sending a single POST request with crafted parameters. No authentication required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Check Belkin website for firmware updates. If unavailable, replace device or implement workarounds.
🔧 Temporary Workarounds
Network Isolation
allPlace router behind firewall with strict inbound rules blocking all WAN access to web interface
Access Restriction
allConfigure firewall to only allow web interface access from specific management IP addresses
🧯 If You Can't Patch
- Replace affected Belkin N300 router with a supported, patched model
- Implement network segmentation to isolate router from critical systems
🔍 How to Verify
Check if Vulnerable:
Check firmware version via router web interface at http://router-ip/ or using nmap scan for device identificationCheck Version:
curl -s http://router-ip/ | grep -i firmware || nmap -sV -p80 router-ipVerify Fix Applied:
Verify firmware version is newer than 1.00.08. No patch verification possible as no fix exists.📡 Detection & Monitoring
Log Indicators:
- POST requests to /setting_hidden.asp with unusual parameter values
- System logs showing unexpected command execution
Network Indicators:
- POST requests to /setting_hidden.asp containing shell metacharacters like ;, |, &, $()
- Unusual outbound connections from router
SIEM Query:
source="router_logs" AND (url="/setting_hidden.asp" AND method="POST" AND (params CONTAINS ";" OR params CONTAINS "|" OR params CONTAINS "$" OR params CONTAINS "`"))