CVE-2023-37719
📋 TL;DR
CVE-2023-37719 is a critical stack overflow vulnerability in Tenda F1202 and FH1202 routers that allows remote code execution. Attackers can exploit this by sending specially crafted requests to the vulnerable fromP2pListFilter function. Users of affected Tenda router models with vulnerable firmware versions are at risk.
💻 Affected Systems
- Tenda F1202
- Tenda FH1202
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attacker to execute arbitrary code, steal credentials, pivot to internal networks, or create persistent backdoors.
Likely Case
Remote code execution leading to device takeover, network traffic interception, and potential lateral movement to connected devices.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Public exploit details available in GitHub repository. The vulnerability is in a web interface function accessible without authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda official website for firmware updates
2. Download latest firmware for your model
3. Access router admin interface
4. Navigate to firmware upgrade section
5. Upload and apply new firmware
6. Reboot router
🔧 Temporary Workarounds
Disable remote management
allTurn off remote administration features to prevent external exploitation
Network segmentation
allIsolate vulnerable routers from critical network segments
🧯 If You Can't Patch
- Replace affected devices with patched or different vendor models
- Implement strict firewall rules blocking all inbound traffic to router management interfaces
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface. Navigate to System Status or About page.Check Version:
curl -s http://router-ip/status.asp | grep -i versionVerify Fix Applied:
Verify firmware version has been updated to a version later than the vulnerable ones listed.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to router management interface
- Multiple failed authentication attempts followed by successful access
- Unexpected process execution or system reboots
Network Indicators:
- Unusual outbound connections from router
- Traffic patterns indicating command and control communication
- Port scanning originating from router
SIEM Query:
source="router_logs" AND (url="*fromP2pListFilter*" OR method="POST" AND uri="*.asp")