Tecnovision DLX Spot - SSH Backdoor Access

# Exploit Title: DlxSpot - Player4 LED video wall - Hardcoded Root SSH Password.
# Google Dork: "DlxSpot - Player4"
# Date: 2017-05-14
# Discoverer: Simon Brannstrom
# Authors Website: https://unknownpwn.github.io/
# Vendor Homepage: http://www.tecnovision.com/
# Software Link: n/a
# Version: All known versions
# Tested on: Linux
# About: DlxSpot is the software controlling Tecnovision LED Video Walls all over the world, they are used in football arenas, concert halls, shopping malls, as roadsigns etc.
# CVE: CVE-2017-12928
# Linked CVE's: CVE-2017-12929, CVE-2017-12930

# Visit my github page at https://github.com/unknownpwn/unknownpwn.github.io/blob/master/README.md for complete takeover of the box, from SQLi to root access.
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Hardcoded password for all dlxspot players, login with the following credentials via SSH

username: dlxuser
password: tecn0visi0n

Escalate to root with the same password.

TIMELINE:
2017-05-14 - Discovery of vulnerabilities.
2017-05-15 - Contacted Tecnovision through contact form on manufacturer homepage.
2017-06-01 - No response, tried contacting again through several contact forms on homepage.
2017-08-10 - Contacted Common Vulnerabilities and Exposures (CVE) requesting CVE assignment.
2017-08-17 - Three CVE's assigned for the vulnerabilities found.
2017-08-22 - With help from fellow hacker and friend, byt3bl33d3r, sent an email in Italian to the company.
2017-09-18 - No response, full public disclosure.

  DEDICATED TO MARCUS ASTROM
FOREVER LOVED - NEVER FORGOTTEN