CVE-2022-29397
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on TOTOLINK N600R routers by exploiting a stack overflow in the comment parameter. Attackers can gain full control of affected devices, potentially compromising network security. Only TOTOLINK N600R routers running specific vulnerable firmware versions are affected.
💻 Affected Systems
- TOTOLINK N600R
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover leading to persistent backdoor installation, network traffic interception, lateral movement to other devices, and participation in botnets.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as a pivot point for further attacks.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation prevents lateral movement.
🎯 Exploit Status
Public exploit code exists in GitHub repositories. The vulnerability requires no authentication and has a simple exploitation path.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check TOTOLINK website for firmware updates. 2. Download latest firmware. 3. Access router web interface. 4. Navigate to firmware upgrade section. 5. Upload new firmware file. 6. Wait for reboot.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router web interface
Network Segmentation
allIsolate router management interface from untrusted networks
🧯 If You Can't Patch
- Place router behind a firewall with strict inbound filtering
- Disable the affected setMacFilterRules functionality if possible
🔍 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 versionVerify Fix Applied:
Verify firmware version is newer than V4.3.0cu.7647_B20210106📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to setMacFilterRules endpoint
- Large comment parameter values in web logs
- Multiple failed exploitation attempts
Network Indicators:
- Unusual outbound connections from router
- Traffic patterns indicating command and control communication
- Port scanning originating from router
SIEM Query:
source="router_logs" AND (uri="/cgi-bin/luci" AND method="POST" AND params CONTAINS "comment")