CVE-2019-12489
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary commands on Fastweb Askey RTV1907VW devices by injecting shell commands into the mount parameter of the usb_remove service. Attackers can achieve full system compromise without authentication. Only users of specific Fastweb Askey router models with vulnerable firmware are affected.
💻 Affected Systems
- Fastweb Askey RTV1907VW
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover leading to network compromise, data theft, malware deployment, and use as attack platform
Likely Case
Remote code execution allowing attacker to modify device configuration, intercept traffic, or join botnets
If Mitigated
Limited impact if device is behind firewall with restricted inbound access
🎯 Exploit Status
Simple HTTP request with command injection between & characters
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not publicly available
Restart Required: No
Instructions:
No official patch available. Consider replacing device or implementing workarounds.
🔧 Temporary Workarounds
Disable web interface
allTurn off HTTP management interface if not needed
Network segmentation
allPlace device behind firewall with strict inbound rules
🧯 If You Can't Patch
- Replace vulnerable device with supported model
- Implement strict network segmentation and firewall rules
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or attempt exploitation with test payloadCheck Version:
Check web interface or use nmap to identify device versionVerify Fix Applied:
Test command injection payloads to confirm they no longer execute📡 Detection & Monitoring
Log Indicators:
- HTTP requests to /usb_remove with unusual mount parameters
- Shell command execution from web service
Network Indicators:
- HTTP POST requests to /usb_remove with command injection patterns
- Outbound connections from router to suspicious IPs
SIEM Query:
http.url:*usb_remove* AND http.param:*&*