CVE-2023-51956
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Tenda AX1803 routers via a stack overflow in the formSetIptv function. Attackers can exploit this by sending specially crafted requests to the vulnerable parameter, potentially gaining full control of affected devices. All users running the vulnerable firmware version are affected.
💻 Affected Systems
- Tenda AX1803
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, allowing attackers to install malware, pivot to internal networks, or create persistent backdoors.
Likely Case
Remote code execution enabling attackers to reconfigure the router, intercept network traffic, or launch attacks against internal devices.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering, though internal attacks remain possible.
🎯 Exploit Status
Public proof-of-concept available; exploitation requires sending crafted HTTP requests to the vulnerable endpoint.
🛠️ 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 AX1803. 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 Remote Management
allPrevents external attackers from accessing the vulnerable web interface.
Log into router admin panel, navigate to Advanced > System Tools > Remote Management, disable remote management
Restrict Web Interface Access
allLimit access to the router's web interface to trusted IP addresses only.
Configure firewall rules to block port 80/443 access to router from untrusted networks
🧯 If You Can't Patch
- Isolate affected routers in a separate network segment with strict firewall rules
- Monitor network traffic for unusual HTTP requests to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin panel: System Status > Firmware VersionCheck Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version is updated beyond v1.0.0.1📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to /goform/setIptv with long iptv.city.vlan parameters
- Multiple failed login attempts followed by exploitation attempts
Network Indicators:
- HTTP traffic to router management interface containing unusually long parameter values
- Unexpected outbound connections from router
SIEM Query:
source="router_logs" AND (uri_path="/goform/setIptv" AND param_length>100)