CVE-2024-2807
📋 TL;DR
A critical stack-based buffer overflow vulnerability in Tenda AC15 routers allows remote attackers to execute arbitrary code by manipulating the filePath parameter in the formExpandDlnaFile function. This affects Tenda AC15 routers running firmware versions 15.03.05.18 and 15.03.20_multi. Attackers can exploit this without authentication to potentially take full control of affected devices.
💻 Affected Systems
- Tenda AC15
📦 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 data exfiltration.
Likely Case
Remote code execution allowing attackers to install malware, modify device configuration, intercept network traffic, or use device as botnet node.
If Mitigated
Limited impact if device is behind firewall with restricted inbound access, though internal attackers could still exploit.
🎯 Exploit Status
Public exploit details available on GitHub. The vulnerability requires no authentication and has straightforward exploitation path for buffer overflow.
🛠️ 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 upgrading to newer firmware if available from Tenda, or replace device with supported model.
🔧 Temporary Workarounds
Disable web management interface from WAN
allPrevent remote access to vulnerable interface by disabling web management from internet-facing interfaces
Router configuration dependent - typically in Administration > Remote Management settings
Block access to vulnerable endpoint
linuxUse firewall rules to block access to /goform/expandDlnaFile endpoint
iptables -A INPUT -p tcp --dport 80 -m string --string "/goform/expandDlnaFile" --algo bm -j DROP
iptables -A INPUT -p tcp --dport 443 -m string --string "/goform/expandDlnaFile" --algo bm -j DROP
🧯 If You Can't Patch
- Isolate affected routers in separate network segment with strict firewall rules
- Replace vulnerable devices with supported models from vendors providing security updates
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at 192.168.0.1 or 192.168.1.1, login and navigate to System Status or About pageCheck Version:
curl -s http://router-ip/goform/getStatus | grep version or check web interface manuallyVerify Fix Applied:
Verify firmware version is no longer 15.03.05.18 or 15.03.20_multi. Test if /goform/expandDlnaFile endpoint responds with error when sent oversized filePath parameter.📡 Detection & Monitoring
Log Indicators:
- Multiple failed requests to /goform/expandDlnaFile
- Unusual long strings in filePath parameter
- Router reboot events following web interface access
Network Indicators:
- HTTP POST requests to /goform/expandDlnaFile with unusually long parameters
- Traffic patterns suggesting buffer overflow exploitation
SIEM Query:
source="router_logs" AND (url="/goform/expandDlnaFile" AND content_length>1000) OR (url="/goform/expandDlnaFile" AND status_code=500)🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/AC15/V1.0%20V15.03.20_multi/formExpandDlnaFile.md
- https://vuldb.com/?ctiid.257662
- https://vuldb.com/?id.257662
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/AC15/V1.0%20V15.03.20_multi/formExpandDlnaFile.md
- https://vuldb.com/?ctiid.257662
- https://vuldb.com/?id.257662
