CVE-2024-50852
📋 TL;DR
This CVE describes a command injection vulnerability in Tenda G3 routers that allows attackers to execute arbitrary commands on the device. The vulnerability exists in the formSetUSBPartitionUmount function and affects Tenda G3 v3.0 routers running firmware version 15.11.0.20. Attackers can exploit this to gain unauthorized access and potentially take full control of affected routers.
💻 Affected Systems
- Tenda G3 v3.0
📦 What is this software?
G3 Firmware by Tendacn
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing persistent backdoor installation, network traffic interception, lateral movement to connected devices, and use as a botnet node.
Likely Case
Remote code execution leading to router configuration changes, credential theft, DNS hijacking, and denial of service.
If Mitigated
Limited impact if network segmentation isolates the router and strict access controls prevent exploitation attempts.
🎯 Exploit Status
Exploit details are publicly available on GitHub, making weaponization likely. Authentication may be required to reach the vulnerable endpoint.
🛠️ 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. Download the latest firmware for G3 v3.0
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 USB Partition Management
allPrevent access to the vulnerable formSetUSBPartitionUmount function by disabling USB-related features if not needed.
Restrict Management Interface Access
linuxLimit access to the router's web management interface to trusted IP addresses only.
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Isolate the router in a dedicated network segment with strict firewall rules
- Implement network monitoring to detect exploitation attempts and unusual router behavior
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface at System Status > Firmware Version. If version is V15.11.0.20, the device is vulnerable.Check Version:
Login to router web interface and navigate to System Status pageVerify Fix Applied:
After updating firmware, verify the version has changed from V15.11.0.20 to a newer version.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to formSetUSBPartitionUmount endpoint
- Commands with shell metacharacters in USB-related logs
- Multiple failed authentication attempts followed by successful access
Network Indicators:
- Unusual outbound connections from router to external IPs
- DNS queries to suspicious domains from router
- Unexpected traffic patterns from router management interface
SIEM Query:
source="router_logs" AND (uri="*formSetUSBPartitionUmount*" OR command="*;*" OR command="*|*" OR command="*&*" OR command="*`*")