CVE-2022-27082
📋 TL;DR
CVE-2022-27082 is a command injection vulnerability in Tenda M3 routers that allows attackers to execute arbitrary commands on the device. This affects Tenda M3 router users running vulnerable firmware versions. Successful exploitation could lead to complete device compromise.
💻 Affected Systems
- Tenda M3 Router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full router compromise allowing attacker to intercept all network traffic, install persistent backdoors, pivot to internal networks, and use the router for botnet activities.
Likely Case
Router takeover enabling network traffic monitoring, DNS hijacking, credential theft, and lateral movement to connected devices.
If Mitigated
Limited impact if router is behind firewall with restricted WAN access and proper network segmentation.
🎯 Exploit Status
Public exploit code available on GitHub. Exploitation requires network access to router's web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Tenda website for latest firmware > V1.0.0.12(4856)
Vendor Advisory: Not publicly documented by vendor
Restart Required: Yes
Instructions:
1. Log into router admin interface. 2. Navigate to System Tools > Firmware Upgrade. 3. Download latest firmware from Tenda website. 4. Upload and install firmware. 5. Reboot router.
🔧 Temporary Workarounds
Disable Remote Management
allDisable WAN access to router web interface
Network Segmentation
allPlace router in isolated network segment with restricted access
🧯 If You Can't Patch
- Replace vulnerable router with different model/brand
- Implement strict firewall rules blocking all access to router management interface from untrusted networks
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is 1.10 V1.0.0.12(4856) or earlier, likely vulnerable.Check Version:
curl -s http://router-ip/goform/getStatus | grep version or check web interfaceVerify Fix Applied:
Verify firmware version is updated beyond V1.0.0.12(4856) and test if /goform/SetInternetLanInfo endpoint still accepts command injection.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/SetInternetLanInfo with shell metacharacters
- Unexpected command execution in system logs
Network Indicators:
- Unusual outbound connections from router
- Suspicious traffic patterns from router IP
SIEM Query:
source="router.log" AND (uri="/goform/SetInternetLanInfo" AND (method="POST") AND (body CONTAINS "|" OR body CONTAINS ";" OR body CONTAINS "`" OR body CONTAINS "$"))