CVE-2023-37707
📋 TL;DR
CVE-2023-37707 is a critical stack overflow vulnerability in Tenda FH1203 routers that allows remote attackers to execute arbitrary code or cause denial of service. The vulnerability affects users of Tenda FH1203 V2.0.1.6 routers exposed to network traffic. Attackers can exploit this without authentication by sending specially crafted requests to the vulnerable function.
💻 Affected Systems
- Tenda FH1203
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, credential theft, and pivot point for attacking internal networks.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as part of a botnet.
If Mitigated
Denial of service causing router reboot or temporary unavailability if exploit attempts fail or are blocked.
🎯 Exploit Status
Public proof-of-concept code exists in GitHub repositories. The vulnerability requires no authentication and has simple exploitation requirements.
🛠️ 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. If update available, download the latest firmware
3. Access router admin interface
4. Navigate to firmware upgrade section
5. Upload and apply the new firmware
6. Wait for router to reboot automatically
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router management interface
Network segmentation
allIsolate vulnerable routers from critical network segments
🧯 If You Can't Patch
- Replace vulnerable routers with patched or different models
- Implement strict network access controls to limit exposure to vulnerable devices
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface (typically at 192.168.0.1 or 192.168.1.1) and compare with affected version V2.0.1.6Check Version:
curl -s http://router-ip/goform/getStatus | grep version (if web interface accessible)Verify Fix Applied:
Verify firmware version has been updated to a version higher than V2.0.1.6📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to router management interface
- Multiple failed exploit attempts
- Router reboot events
Network Indicators:
- Unusual traffic patterns to/from router management port
- Exploit-specific payload patterns in network traffic
SIEM Query:
source="router_logs" AND ("fromVirtualSer" OR "page parameter" OR unusual_http_request)