CVE-2023-51095
📋 TL;DR
Tenda M3 routers running firmware version 1.0.0.12(4856) contain a stack-based buffer overflow vulnerability in the formDelWlRfPolicy function. This allows remote attackers to execute arbitrary code or cause denial of service by sending specially crafted requests. The vulnerability affects all users of these specific router models with the vulnerable firmware.
💻 Affected Systems
- Tenda M3
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, network infiltration, data exfiltration, and persistent backdoor installation.
Likely Case
Denial of service causing router crashes and network disruption, potentially requiring physical reset.
If Mitigated
Limited impact if network segmentation isolates the router and external access is restricted.
🎯 Exploit Status
Public proof-of-concept code exists in GitHub repositories. The vulnerability appears to be remotely exploitable without authentication.
🛠️ 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 available, download the latest firmware. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply the new firmware. 6. Reboot the router.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to the vulnerable interface by disabling remote administration features.
Network segmentation
allIsolate the Tenda M3 router on a separate network segment to limit potential lateral movement.
🧯 If You Can't Patch
- Replace the router with a different model or from a different vendor
- Implement strict firewall rules to block all external access to the router's management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If it shows V1.0.0.12(4856), the device is vulnerable.Check Version:
Login to router admin interface and check System Status or Firmware Version page.Verify Fix Applied:
After firmware update, verify the version no longer shows V1.0.0.12(4856). Test that the router functions normally.📡 Detection & Monitoring
Log Indicators:
- Multiple failed connection attempts to router management interface
- Unusual traffic patterns to router's web interface port
- Router crash/reboot logs
Network Indicators:
- Unusual HTTP POST requests to router management endpoints
- Traffic spikes to router's management port from external sources
SIEM Query:
source_ip=external AND dest_port=80 OR dest_port=443 AND dest_ip=router_ip AND http_method=POST AND uri_contains="formDelWlRfPolicy"