CVE-2017-9026
📋 TL;DR
A stack buffer overflow vulnerability in the vshttpd web server (also called ioos) on HooToo Trip Mate 6 travel routers allows remote unauthenticated attackers to execute arbitrary code by sending a specially crafted GET request. This affects Trip Mate 6 devices running firmware version 2.000.030 and earlier. Attackers can control the program counter and potentially take full control of the device.
💻 Affected Systems
- HooToo Trip Mate 6 (TM6)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, allowing attackers to install persistent malware, pivot to internal networks, or use the device for botnet activities.
Likely Case
Remote code execution resulting in device takeover, enabling attackers to modify device settings, intercept network traffic, or use the device as a foothold for further attacks.
If Mitigated
If properly segmented and monitored, impact limited to the device itself without lateral movement to other systems.
🎯 Exploit Status
The vulnerability is well-documented with proof-of-concept code available. Exploitation requires sending a specially crafted HTTP GET request with a malicious fname parameter.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Firmware newer than 2.000.030
Vendor Advisory: Not publicly available
Restart Required: Yes
Instructions:
1. Check current firmware version via web interface. 2. Download latest firmware from HooToo support site. 3. Upload firmware via web interface. 4. Reboot device after update completes.
🔧 Temporary Workarounds
Disable vshttpd service
linuxStop the vulnerable web server to prevent exploitation
killall vshttpd
systemctl stop vshttpd
Block external access
linuxUse firewall rules to block inbound access to port 80
iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Segment the device on an isolated network VLAN
- Implement strict firewall rules to limit inbound connections to the device
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface at http://device-ip/status.cgi or via SSH if enabled: cat /etc/versionCheck Version:
cat /etc/versionVerify Fix Applied:
Verify firmware version is newer than 2.000.030 and test that the exploit no longer works📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP GET requests with long fname parameters
- vshttpd crash logs
- Multiple failed exploit attempts
Network Indicators:
- HTTP requests with unusually long fname parameters (>1000 characters)
- Traffic patterns indicating exploit attempts
SIEM Query:
source="device_logs" AND (http_method="GET" AND url CONTAINS "fname=" AND url_length>1000)