CVE-2023-50983
📋 TL;DR
This CVE describes a command injection vulnerability in Tenda i29 routers that allows attackers to execute arbitrary commands on the device. The vulnerability exists in the sysScheduleRebootSet function and affects Tenda i29 v1.0 V1.0.0.5 firmware. Attackers can exploit this to gain full control of affected routers.
💻 Affected Systems
- Tenda i29
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing persistent backdoor installation, network traffic interception, lateral movement to connected devices, and botnet recruitment.
Likely Case
Remote code execution leading to router configuration changes, DNS hijacking, credential theft, and denial of service.
If Mitigated
Limited impact with proper network segmentation, firewall rules blocking external access to router management interfaces, and regular firmware updates.
🎯 Exploit Status
Exploit requires authentication to the router's web interface. Public proof-of-concept available on GitHub.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: http://tenda.com
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates
2. Download latest firmware for i29 model
3. Log into router web interface
4. Navigate to System Tools > Firmware Upgrade
5. Upload and install new firmware
6. Reboot router after installation
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router management interface
Network Segmentation
allIsolate router management interface to separate VLAN
🧯 If You Can't Patch
- Replace affected router with supported model
- Implement strict firewall rules blocking all external access to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface under System Status > Firmware VersionCheck Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version has been updated to newer than V1.0.0.5📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/sysScheduleRebootSet
- Unexpected system reboots
- Suspicious command execution in system logs
Network Indicators:
- Unusual outbound connections from router
- Traffic to known malicious IPs
- DNS queries to suspicious domains
SIEM Query:
source="router.log" AND "sysScheduleRebootSet" AND ("cmd" OR "|" OR ";" OR "$")