CVE-2022-28969
📋 TL;DR
CVE-2022-28969 is a stack overflow vulnerability in Tenda AX1806 routers that allows attackers to cause a Denial of Service (DoS) by sending specially crafted requests to the shareSpeed parameter. This affects Tenda AX1806 router users running vulnerable firmware versions. Attackers can crash the router's web interface or potentially execute arbitrary code.
💻 Affected Systems
- Tenda AX1806
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete router compromise, persistent backdoor installation, and network infiltration.
Likely Case
Denial of Service causing router reboot or web interface crash, disrupting network connectivity.
If Mitigated
Limited to DoS with quick recovery if proper network segmentation and monitoring are in place.
🎯 Exploit Status
Public proof-of-concept code is available in GitHub repositories. Exploitation requires sending a crafted HTTP request to the router's web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Tenda website for firmware updates beyond v1.0.0.1
Vendor Advisory: Not publicly documented by vendor
Restart Required: Yes
Instructions:
1. Log into Tenda router web interface. 2. Navigate to System Tools > Firmware Upgrade. 3. Download latest firmware from Tenda website. 4. Upload and install firmware update. 5. Reboot router after installation.
🔧 Temporary Workarounds
Disable Guest WiFi
allDisable the guest WiFi feature that contains the vulnerable function
Restrict Management Access
allLimit router management interface access to trusted IP addresses only
🧯 If You Can't Patch
- Isolate router on separate VLAN with strict firewall rules
- Disable remote management and WAN-side access to web interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface under System Status. If version is v1.0.0.1, device is vulnerable.Check Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version has been updated to a version later than v1.0.0.1📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts
- Unusual HTTP POST requests to /goform/setWifiGuestBasic
- Router reboot logs
Network Indicators:
- Unusual traffic to router port 80/443 from external IPs
- HTTP requests with large shareSpeed parameter values
SIEM Query:
source="router_logs" AND (uri="/goform/setWifiGuestBasic" OR message="reboot")