CVE-2023-50992
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Tenda i29 routers by exploiting a stack overflow in the setPing function's ip parameter. Attackers can gain full control of affected devices, potentially compromising network security. All users of Tenda i29 v1.0 V1.0.0.5 are affected.
💻 Affected Systems
- Tenda i29
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover 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 router settings, intercept traffic, or use the device as a pivot point for further attacks.
If Mitigated
Limited impact if device is behind strict firewall rules and network segmentation prevents lateral movement.
🎯 Exploit Status
Public proof-of-concept exists in GitHub repository, making exploitation straightforward for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: http://tenda.com
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. If update available, download and install via router admin interface. 3. Reboot router after installation.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router administration interface
Access router admin panel -> Advanced Settings -> Remote Management -> Disable
Network segmentation
allIsolate router management interface from untrusted networks
Configure firewall rules to restrict access to router IP on port 80/443
🧯 If You Can't Patch
- Replace affected router with updated model or different vendor
- Implement strict network access controls and monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or Firmware Upgrade sectionCheck Version:
curl -s http://router-ip/status.cgi | grep firmware_versionVerify Fix Applied:
Verify firmware version has changed from V1.0.0.5 to a newer version📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to setPing function
- Multiple failed login attempts followed by setPing requests
- Router configuration changes without authorized user action
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 (uri="/goform/setPing" OR message="setPing")