CVE-2018-20841
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary commands on HooToo TripMate Titan routers by injecting shell metacharacters in the mac parameter of a specific web request. Affected devices are HT-TM05 and HT-05 routers running vulnerable firmware versions, potentially giving attackers full control over the router.
💻 Affected Systems
- HooToo TripMate Titan HT-TM05
- HooToo TripMate Titan HT-05
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of router with ability to intercept all network traffic, install persistent malware, pivot to internal network devices, and use router as attack platform.
Likely Case
Router takeover leading to DNS hijacking, credential theft from network traffic, and installation of backdoors.
If Mitigated
Limited impact if router is behind firewall with restricted WAN access and proper network segmentation.
🎯 Exploit Status
Exploit is trivial to execute with publicly available proof-of-concept code. No authentication required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No vendor advisory found
Restart Required: No
Instructions:
No official patch available. Consider replacing affected routers with supported models from different vendors.
🔧 Temporary Workarounds
Disable remote administration
allTurn off remote management/administration features to prevent external exploitation
Access router admin interface > Security/Administration > Disable Remote Management
Network isolation
allPlace router behind firewall with strict inbound rules
Configure firewall to block inbound traffic to router IP on ports 80/443
🧯 If You Can't Patch
- Replace affected routers with supported models from reputable vendors
- Implement strict network segmentation to isolate router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface. If version is 2.000.022 or 2.000.082, device is vulnerable.Check Version:
Access router web interface at http://[router-ip] and check firmware version in System/Status sectionVerify Fix Applied:
No fix available to verify. Consider device permanently vulnerable if running affected firmware.📡 Detection & Monitoring
Log Indicators:
- HTTP requests to protocol.csp with mac parameter containing special characters
- Unusual command execution in router logs
- Multiple failed login attempts followed by successful access
Network Indicators:
- HTTP POST requests to /protocol.csp with shell metacharacters in parameters
- Outbound connections from router to suspicious IPs
- DNS queries to malicious domains from router
SIEM Query:
http.url:*protocol.csp* AND http.param:*mac=* AND (http.param:*;* OR http.param:*|* OR http.param:*`* OR http.param:*$(*)