CVE-2017-12928
📋 TL;DR
CVE-2017-12928 is a critical vulnerability in TecnoVISION DLX Spot Player4 where a hard-coded SSH password allows remote attackers to gain root access. All known versions of this digital signage software are affected, enabling complete system compromise.
💻 Affected Systems
- TecnoVISION DLX Spot Player4
📦 What is this software?
Dlx Spot Player4 by Tecnovision
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain full root control over the system, allowing them to install malware, exfiltrate data, pivot to other network systems, or render the device unusable.
Likely Case
Remote attackers exploit the hard-coded credentials to gain SSH access and escalate to root, taking full control of affected digital signage players.
If Mitigated
If SSH is disabled or network access is restricted, impact is limited to local attackers or those with network access to the device.
🎯 Exploit Status
Exploitation requires only SSH client and knowledge of the hard-coded password 'tecn0visi0n' for dlxuser account, with sudo privileges to root.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None available
Vendor Advisory: No vendor advisory found
Restart Required: No
Instructions:
No official patch exists. Vendor appears unresponsive. Must implement workarounds or replace affected systems.
🔧 Temporary Workarounds
Change SSH Password
linuxChange the password for dlxuser account and ensure it's strong and unique.
passwd dlxuser
Disable SSH Access
linuxDisable SSH service to prevent remote access entirely.
systemctl stop ssh
systemctl disable ssh
Remove Sudo Privileges
linuxRemove dlxuser from sudoers file to prevent privilege escalation.
visudo (remove dlxuser from sudoers)
🧯 If You Can't Patch
- Isolate affected systems in separate network segments with strict firewall rules
- Implement network monitoring and alerting for SSH authentication attempts
🔍 How to Verify
Check if Vulnerable:
Attempt SSH login with username 'dlxuser' and password 'tecn0visi0n'. If successful, system is vulnerable.Check Version:
No standard version command. Check device documentation or contact vendor.Verify Fix Applied:
Verify SSH login fails with old password, check dlxuser is not in sudoers, and confirm SSH service is disabled if chosen workaround.📡 Detection & Monitoring
Log Indicators:
- Failed SSH login attempts
- Successful SSH login as dlxuser
- Sudo privilege escalation by dlxuser
Network Indicators:
- SSH connections to port 22 from unexpected sources
- Unusual outbound connections after SSH login
SIEM Query:
source="auth.log" AND (user="dlxuser" OR (ssh AND success))