CVE-2024-0994
📋 TL;DR
A critical stack-based buffer overflow vulnerability exists in Tenda W6 routers running firmware version 1.0.0.9(4122). Attackers can remotely exploit this by sending specially crafted HTTP requests to the /goform/setcfm endpoint, potentially allowing arbitrary code execution. This affects all users of vulnerable Tenda W6 routers with the affected firmware.
💻 Affected Systems
- Tenda W6
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote attackers gain full control of the router, enabling them to intercept network traffic, install malware, pivot to internal networks, or brick the device.
Likely Case
Attackers execute arbitrary code with router privileges, potentially creating backdoors, modifying configurations, or launching attacks against internal devices.
If Mitigated
With proper network segmentation and access controls, impact is limited to the router itself without lateral movement to other systems.
🎯 Exploit Status
Public exploit details are available, and the vulnerability requires minimal technical skill to exploit via simple HTTP requests.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available - vendor did not respond to disclosure
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. If update available, download and install via router web interface. 3. Reboot router after installation. 4. Verify firmware version is no longer 1.0.0.9(4122).
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router management interface
Access router web interface > System Tools > Remote Management > Disable
Network Segmentation
allIsolate router management interface to trusted network segment
Configure firewall rules to restrict access to router IP on ports 80/443
🧯 If You Can't Patch
- Replace affected Tenda W6 routers with different models or brands
- Implement strict network access controls to limit who can reach the router management interface
🔍 How to Verify
Check if Vulnerable:
Access router web interface > System Tools > Firmware Upgrade > Check current firmware version matches 1.0.0.9(4122)Check Version:
curl -s http://router-ip/goform/getStatus | grep firmware or check web interfaceVerify Fix Applied:
Verify firmware version is different from 1.0.0.9(4122) after update📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /goform/setcfm with abnormal parameter lengths
- Router crash/restart logs
- Unusual configuration changes
Network Indicators:
- HTTP traffic to router IP on port 80/443 with /goform/setcfm path
- Unusual outbound connections from router
SIEM Query:
source="router_logs" AND (url="/goform/setcfm" OR message="buffer overflow" OR message="crash")🔗 References
- https://jylsec.notion.site/Tenda-W6-has-stack-buffer-overflow-vulnerability-in-formSetCfm-4fab28f92ca74f519245b606d8345821?pvs=4
- https://vuldb.com/?ctiid.252259
- https://vuldb.com/?id.252259
- https://jylsec.notion.site/Tenda-W6-has-stack-buffer-overflow-vulnerability-in-formSetCfm-4fab28f92ca74f519245b606d8345821?pvs=4
- https://vuldb.com/?ctiid.252259
- https://vuldb.com/?id.252259
