CVE-2023-41554
📋 TL;DR
CVE-2023-41554 is a critical stack overflow vulnerability in Tenda AC9 routers that allows remote attackers to execute arbitrary code by sending specially crafted requests to the /goform/WifiExtraSet endpoint. This affects Tenda AC9 V3.0 routers running firmware version 15.03.06.42_multi, potentially giving attackers full control of the device.
💻 Affected Systems
- Tenda AC9 V3.0
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, credential theft, network pivoting to internal systems, and participation in botnets.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept network traffic, and use the device as a foothold for further attacks.
If Mitigated
Limited impact if device is behind strict firewall rules, but still vulnerable to internal attackers or if exposed to internet.
🎯 Exploit Status
Public proof-of-concept exists in GitHub repositories. The vulnerability requires no authentication and has a simple exploitation path.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda's official website for firmware updates. 2. Download the latest firmware for AC9 V3.0. 3. Log into router admin panel. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install the new firmware. 6. Reboot the router.
🔧 Temporary Workarounds
Disable WPS/WiFi Extra Features
allDisable the vulnerable WiFiExtraSet functionality if possible through admin interface
Network Segmentation
allIsolate the router on a separate VLAN to limit potential damage
🧯 If You Can't Patch
- Replace the router with a different model or vendor
- Implement strict firewall rules to block all external access to the router's admin interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin panel at 192.168.0.1 or 192.168.1.1, navigate to System Status or About pageCheck Version:
curl -s http://router-ip/goform/getStatus | grep version or check web interfaceVerify Fix Applied:
Verify firmware version is no longer 15.03.06.42_multi after update📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/WifiExtraSet
- Multiple failed login attempts followed by WifiExtraSet requests
- Router configuration changes without authorized user action
Network Indicators:
- Unusual outbound connections from router
- Traffic to known malicious IPs from router
- DNS hijacking or unexpected proxy settings
SIEM Query:
source="router_logs" AND (uri_path="/goform/WifiExtraSet" OR wpapsk_crypto IN request_body)