CVE-2024-4117
📋 TL;DR
This critical vulnerability in Tenda W15E routers allows remote attackers to execute arbitrary code via a stack-based buffer overflow in the formDelPortMapping function. Attackers can exploit this by manipulating the portMappingIndex parameter, potentially gaining full control of affected devices. All users running Tenda W15E firmware version 15.11.0.14 are affected.
💻 Affected Systems
- Tenda W15E
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, allowing attackers to install malware, pivot to internal networks, or create persistent backdoors.
Likely Case
Device takeover enabling network reconnaissance, traffic interception, or participation in botnets.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering, though internal network exposure remains a concern.
🎯 Exploit Status
Exploit details are publicly available on GitHub, and the vulnerability requires no authentication to exploit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available - vendor did not respond to disclosure
Restart Required: Yes
Instructions:
No official patch available. Consider replacing affected devices or implementing strict network controls.
🔧 Temporary Workarounds
Disable remote management
allDisable web management interface access from WAN/Internet
Network segmentation
allIsolate Tenda W15E devices in separate VLAN with strict firewall rules
🧯 If You Can't Patch
- Immediately remove affected devices from internet-facing positions
- Implement strict network access controls to limit traffic to/from affected devices
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at http://[router-ip]/goform/getStatus or via SSH if enabledCheck Version:
curl -s http://[router-ip]/goform/getStatus | grep versionVerify Fix Applied:
No fix available to verify. Monitor for firmware updates from Tenda.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/DelPortMapping with malformed portMappingIndex parameters
- Multiple failed buffer overflow attempts in web interface logs
Network Indicators:
- Unusual outbound connections from router to unknown IPs
- Traffic spikes from router to command and control servers
SIEM Query:
source="router_logs" AND (uri_path="/goform/DelPortMapping" OR message="*buffer overflow*" OR message="*portMappingIndex*" AND status="200")🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/W15Ev1.0/formDelPortMapping.md
- https://vuldb.com/?ctiid.261860
- https://vuldb.com/?id.261860
- https://vuldb.com/?submit.317822
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/W15Ev1.0/formDelPortMapping.md
- https://vuldb.com/?ctiid.261860
- https://vuldb.com/?id.261860
- https://vuldb.com/?submit.317822
