CVE-2022-28082
📋 TL;DR
CVE-2022-28082 is a critical stack overflow vulnerability in Tenda AX12 routers that allows remote attackers to execute arbitrary code by sending specially crafted requests to the /goform/SetNetControlList endpoint. This affects Tenda AX12 v22.03.01.21_CN routers with default configurations, potentially giving attackers full control of the device.
💻 Affected Systems
- Tenda AX12
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, lateral movement to connected devices, and botnet recruitment.
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 the vulnerable endpoint is blocked or the device is isolated from untrusted networks.
🎯 Exploit Status
Public proof-of-concept code exists in GitHub repositories, making exploitation straightforward for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not publicly available
Restart Required: Yes
Instructions:
1. Check Tenda's official website for firmware updates. 2. Download the latest firmware for AX12. 3. Access router admin panel. 4. Navigate to firmware upgrade section. 5. Upload and apply the new firmware. 6. Reboot the router.
🔧 Temporary Workarounds
Block Vulnerable Endpoint
linuxUse firewall rules to block access to /goform/SetNetControlList endpoint
iptables -A INPUT -p tcp --dport 80 -m string --string "/goform/SetNetControlList" --algo bm -j DROP
Disable Remote Management
allTurn off remote administration features in router settings
🧯 If You Can't Patch
- Isolate affected routers in a separate VLAN with strict network segmentation
- Implement network monitoring and intrusion detection for suspicious traffic to router management interfaces
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin panel or via command: curl -s http://router-ip/version.txt | grep 22.03.01.21_CNCheck Version:
curl -s http://router-ip/version.txtVerify Fix Applied:
Verify firmware version has changed from v22.03.01.21_CN and test if /goform/SetNetControlList endpoint still accepts malformed input📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/SetNetControlList with large payloads
- Unusual process execution in router logs
- Configuration changes not initiated by administrators
Network Indicators:
- HTTP requests with oversized list parameters to router management interface
- Unusual outbound connections from router to unknown IPs
SIEM Query:
source="router_logs" AND (uri="/goform/SetNetControlList" AND content_length>1000)