CVE-2023-51092
📋 TL;DR
This CVE describes a stack overflow vulnerability in Tenda M3 routers that allows remote attackers to execute arbitrary code via the upgrade function. Attackers can exploit this to gain full control of affected devices. All users running vulnerable firmware versions are affected.
💻 Affected Systems
- Tenda M3
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, lateral movement to other devices, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify device configuration, intercept traffic, or use the device as a pivot point for further attacks.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation prevents lateral movement.
🎯 Exploit Status
Public proof-of-concept exists in GitHub repository, making exploitation straightforward for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. Download latest firmware. 3. Access router admin interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload new firmware file. 6. Wait for reboot.
🔧 Temporary Workarounds
Network Isolation
allPlace affected routers behind firewalls with strict inbound filtering to block external exploitation attempts.
Disable Remote Management
allTurn off remote administration features to reduce attack surface.
🧯 If You Can't Patch
- Replace affected devices with different models from vendors with better security track records
- Implement strict network segmentation to isolate vulnerable devices from critical assets
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin interface under System Status or System Tools > Firmware Upgrade.Check Version:
No single command - check via web interface at http://router_ip or use nmap -sV -p80,443 router_ipVerify Fix Applied:
Verify firmware version has been updated to a version later than V1.0.0.12(4856).📡 Detection & Monitoring
Log Indicators:
- Unusual upgrade attempts
- Multiple failed authentication attempts to admin interface
- Unexpected firmware modification logs
Network Indicators:
- Unusual outbound connections from router
- Traffic patterns suggesting command and control communication
- Port scanning originating from router
SIEM Query:
source="router_logs" AND (event="upgrade" OR event="firmware") AND status="failed" | stats count by src_ip