CVE-2022-27078
📋 TL;DR
This CVE describes a command injection vulnerability in Tenda M3 routers that allows attackers to execute arbitrary commands on the device. The vulnerability exists in the /goform/setAdInfoDetail component and affects Tenda M3 router users running vulnerable firmware. Attackers can exploit this to gain full control of affected routers.
💻 Affected Systems
- Tenda M3 Router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing persistent backdoor installation, network traffic interception, lateral movement to connected devices, and router bricking.
Likely Case
Remote code execution leading to router configuration changes, DNS hijacking, credential theft, and botnet recruitment.
If Mitigated
Limited impact if network segmentation isolates routers and strict firewall rules prevent external access to management interfaces.
🎯 Exploit Status
Public proof-of-concept available on GitHub demonstrates exploitation. Simple HTTP POST request with crafted parameters triggers command injection.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. Download latest firmware. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload new firmware file. 6. Wait for reboot.
🔧 Temporary Workarounds
Disable WAN Management Access
allPrevent external access to router management interface
Access router admin panel → Advanced Settings → Remote Management → Disable
Network Segmentation
allIsolate router management interface to separate VLAN
🧯 If You Can't Patch
- Replace affected routers with patched or different vendor models
- Implement strict firewall rules blocking all external access to router management ports (typically 80, 443, 8080)
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is 1.10 V1.0.0.12(4856), device is vulnerable.Check Version:
curl -s http://router-ip/goform/getStatus | grep version OR check web admin interfaceVerify Fix Applied:
After firmware update, verify version has changed from vulnerable version. Test if /goform/setAdInfoDetail endpoint still accepts malicious input.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/setAdInfoDetail
- Commands like 'ping', 'wget', 'curl' in router logs
- Multiple failed login attempts followed by successful access
Network Indicators:
- Unexpected outbound connections from router
- DNS queries to suspicious domains
- Port scans originating from router
SIEM Query:
source="router_logs" AND uri="/goform/setAdInfoDetail" AND (method="POST" OR params CONTAINS "|" OR params CONTAINS ";" OR params CONTAINS "`")