CVE-2022-27080
📋 TL;DR
CVE-2022-27080 is a command injection vulnerability in Tenda M3 routers that allows attackers to execute arbitrary commands on the device. This affects Tenda M3 routers running firmware version 1.10 V1.0.0.12(4856) via the /goform/setWorkmode endpoint. Attackers can gain full control of vulnerable routers.
💻 Affected Systems
- Tenda M3 Router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of router with persistent backdoor installation, credential theft, network traffic interception, and lateral movement to internal networks.
Likely Case
Router takeover leading to DNS hijacking, credential harvesting, and botnet recruitment.
If Mitigated
Limited impact with proper network segmentation and firewall rules blocking external access to management interfaces.
🎯 Exploit Status
Public exploit code exists in GitHub repositories. Exploitation requires sending crafted HTTP requests to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Later firmware versions from Tenda
Vendor Advisory: Not publicly documented by vendor
Restart Required: Yes
Instructions:
1. Check current firmware version via router web interface. 2. Visit Tenda support website for latest firmware. 3. Download and upload firmware via router admin panel. 4. Apply update and restart router.
🔧 Temporary Workarounds
Block External Management Access
linuxConfigure firewall to block external access to router web management interface (typically port 80/443).
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Disable Vulnerable Endpoint
allIf possible, disable or restrict access to /goform/setWorkmode endpoint via router configuration.
🧯 If You Can't Patch
- Segment router management interface to internal network only
- Implement strict network access controls and monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at 192.168.0.1 or 192.168.1.1. Look for version 1.10 V1.0.0.12(4856).Check Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version has been updated to a newer version than 1.10 V1.0.0.12(4856).📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /goform/setWorkmode with unusual parameters
- Command execution patterns in system logs
- Unusual process creation
Network Indicators:
- HTTP POST requests to router IP on port 80/443 with command injection patterns
- Unusual outbound connections from router
SIEM Query:
source="router_logs" AND (url="/goform/setWorkmode" OR command="*;*" OR command="*|*")