CVE-2024-4118
📋 TL;DR
A critical stack-based buffer overflow vulnerability in Tenda W15E routers allows remote attackers to execute arbitrary code by sending specially crafted requests to the formIPMacBindAdd 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, lateral movement to internal networks, persistent backdoor installation, and botnet recruitment.
Likely Case
Device takeover enabling network traffic interception, credential theft, denial of service, and use as attack platform against internal systems.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Public exploit code available on GitHub. Remote exploitation requires no authentication. Simple buffer overflow with predictable exploitation path.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Vendor was contacted but did not respond. Consider replacing affected devices or implementing workarounds.
🔧 Temporary Workarounds
Network Access Control
linuxBlock external access to router web interface using firewall rules
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Disable Remote Management
allTurn off remote management feature in router settings
🧯 If You Can't Patch
- Isolate affected routers in separate VLAN with strict firewall rules
- Implement network monitoring for exploit attempts and anomalous traffic
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at 192.168.0.1 or using command: curl -s http://192.168.0.1/goform/getStatus | grep versionCheck Version:
curl -s http://192.168.0.1/goform/getStatus | grep -o '"version":"[^"]*"'Verify Fix Applied:
Verify firmware version is no longer 15.11.0.14. Test endpoint with safe payload to confirm overflow is prevented.📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/addIpMacBind with long IPMacBindRule parameters
- Device crash/restart logs
- Unusual process execution
Network Indicators:
- HTTP POST requests to router IP on port 80/443 with oversized parameters
- Traffic patterns indicating exploit delivery
SIEM Query:
source="router.log" AND (url="/goform/addIpMacBind" AND content_length>1000)🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/W15Ev1.0/formIPMacBindAdd.md
- https://vuldb.com/?ctiid.261861
- https://vuldb.com/?id.261861
- https://vuldb.com/?submit.317823
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/W15Ev1.0/formIPMacBindAdd.md
- https://vuldb.com/?ctiid.261861
- https://vuldb.com/?id.261861
- https://vuldb.com/?submit.317823
