CVE-2024-4122
📋 TL;DR
A critical stack-based buffer overflow vulnerability in Tenda W15E routers allows remote attackers to execute arbitrary code by manipulating parameters in the formSetDebugCfg function. This affects Tenda W15E routers running firmware version 15.11.0.14. Attackers can exploit this without authentication to potentially take full control of affected devices.
💻 Affected Systems
- Tenda W15E
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, creation of persistent backdoors, lateral movement to internal networks, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify device configuration, intercept network traffic, or use the device as a pivot point for further attacks.
If Mitigated
Limited impact if devices are behind firewalls with strict ingress filtering and network segmentation prevents lateral movement.
🎯 Exploit Status
Public exploit details are available on GitHub. The vulnerability requires no authentication and has straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
No official patch available. Contact Tenda support for firmware updates. If an update becomes available, download from official Tenda website, upload via web interface, and reboot device.
🔧 Temporary Workarounds
Disable Remote Management
allDisable web management interface access from WAN/Internet to prevent remote exploitation
Access router web interface > Advanced > System Tools > Remote Management > Disable
Restrict Management Access
allLimit web interface access to specific trusted IP addresses only
Access router web interface > Advanced > Security > Access Control > Add trusted IP rules
🧯 If You Can't Patch
- Segment affected routers in isolated network zones to limit lateral movement
- Implement strict firewall rules blocking all inbound traffic to router management interfaces
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface: Login > Advanced > System Tools > Firmware Upgrade. If version is 15.11.0.14, device is vulnerable.Check Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version has been updated to a version later than 15.11.0.14. Check that remote management is disabled.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/setDebugCfg with long parameter values
- Multiple failed login attempts followed by successful exploitation
Network Indicators:
- Unusual outbound connections from router to unknown IPs
- Traffic spikes from router management interface
SIEM Query:
source="router_logs" AND (uri_path="/goform/setDebugCfg" OR (http_method="POST" AND uri_path CONTAINS "setDebugCfg"))🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/W15Ev1.0/formSetDebugCfg.md
- https://vuldb.com/?ctiid.261865
- https://vuldb.com/?id.261865
- https://vuldb.com/?submit.317827
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/W15Ev1.0/formSetDebugCfg.md
- https://vuldb.com/?ctiid.261865
- https://vuldb.com/?id.261865
- https://vuldb.com/?submit.317827
