CVE-2024-42978
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary commands on Tenda FH1206 routers via a crafted HTTP request to the /goform/telnet endpoint. Attackers can gain full control of affected devices without authentication. All users running the vulnerable firmware version are affected.
💻 Affected Systems
- Tenda FH1206
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to install persistent malware, pivot to internal networks, intercept all network traffic, or brick the device.
Likely Case
Attackers gain shell access to execute commands, potentially installing backdoors, modifying configurations, or launching attacks against internal network devices.
If Mitigated
If network segmentation and access controls are properly implemented, impact may be limited to the router itself rather than the entire network.
🎯 Exploit Status
The GitHub reference contains technical details that could be used to create working exploits. No authentication is required to trigger the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
Check Tenda's official website for firmware updates. If available, download the latest firmware and apply it through the router's web interface under System Tools > Firmware Upgrade.
🔧 Temporary Workarounds
Disable remote management
allDisable remote management features to prevent external access to the vulnerable endpoint
Network segmentation
allIsolate the router on a separate VLAN to limit potential lateral movement
🧯 If You Can't Patch
- Replace the device with a different model or vendor that provides security updates
- 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 web interface under System Status. If version is v02.03.01.35, device is vulnerable.Check Version:
Check router web interface or use: curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
After updating firmware, verify version has changed from v02.03.01.35 and test if /goform/telnet endpoint still responds to crafted requests.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to /goform/telnet
- Unexpected telnet service activation
- Suspicious command execution in router logs
Network Indicators:
- HTTP requests to router IP on port 80/443 with crafted telnet parameters
- Unexpected outbound connections from router
SIEM Query:
source="router_logs" AND (uri="/goform/telnet" OR message="telnet")