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Schrack MICROCONTROL XSS / Disclosure / Weak Default Password

Schrack MICROCONTROL XSS / Disclosure / Weak Default Password
Posted Jul 11, 2014
Authored by Christian Kudera | Site sec-consult.com

Schrack MICROCONTROL versions prior to 1.7.0 (937) suffer from cross site scripting, weak default password, and data disclosure vulnerabilities.

tags | exploit, vulnerability, xss
SHA-256 | ac3daaa3ec1fea3bd206d4c88bfd45b9b0def76b61c4b06bde03b01f98f45c67

Schrack MICROCONTROL XSS / Disclosure / Weak Default Password

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SEC Consult Vulnerability Lab Security Advisory < 20140710-2 >
title: Multiple critical vulnerabilites
product: Schrack MICROCONTROL emergency light system
vulnerable version: before 1.7.0 (937)
fixed version: 1.7.0 (937)
impact: critical
homepage: http://www.schrack.at/shop/sicherheitsbeleuchtung.html
found: 2014-02-05
by: C. Kudera
SEC Consult Vulnerability Lab

Vendor description:
"The microControl is a decentralized power supply system with limited power
(LowPower system) for 1-, 3- or 8-hour operation. This system combines the high
reliability of a decentralized single-battery system with the ease and comfort
of a central battery system. "

Source: http://image.schrack.com/datenblaetter/h_nlmi102_de.pdf

Business recommendation:
The Microcontrol emergency light system, distributed by Schrack Technik GmbH,
is an autarchic emergency light system, which is configurable over a web
Through the vulnerabilities described in this advisory an attacker can
reconfigure the whole emergency light system without authentication.

Furthermore he can perform attacks against the users of the web application
to deploy Cross-Site-Scripting Trojan Horses or steal sensitive data.

It is highly recommended by SEC Consult not to use this product until a
thorough security review has been performed by security professionals and all
identified issues have been resolved.

Vulnerability overview/description:
1) Access data disclosure
The access data for the ftp and telnet services is accessible without
authentication. This information enables an attacker to access the file system
of the emergency light system, where he can reconfigure the whole system.

2) Weak default password
The password for the web interface can't be changed. The emergency light system
is always delivered with the same weak password to every customer. An attacker
can reverse engineer the firmware of the emergency light system or request the
password from Schrack Technik GmbH.

3) Permanent Cross Site Scripting (XSS)
The emergency light system doesn’t encode user input properly. This leads to
Cross-Site Scripting vulnerabilities. The vulnerability can be used to
persistently include HTML- or JavaScript code to the affected web page. The code
is executed in the browser of users if they visit the manipulated site. The
vulnerability can be used to change the contents of the displayed site, redirect
to other sites or steal user credentials. Additionally, users are potential
victims of browser exploits and JavaScript Trojan Horses.

4) Clear text authentication
Login data of users is transmitted in clear text. By intercepting network
traffic, an attacker can eavesdrop authentication data and take over the
victim's account.

Proof of concept:
1) Access data disclosure
The ZTPUsrDtls.txt can be accessed via http://<system_ip>/ZTPUsrDtls.txt

2) Weak default password
The credentials are user:not

3) Permanent Cross Site Scripting (XSS)
Several Permanent Cross Site Scripting vulnerabilities were noticed in the
product during the audit (e.g position textbox in the configuration menu).

4) Clear text authentication
The web page is only accessible via the HTTP protocol. Login data can be
recorded with a network sniffer.
Furthermore a telnet service is running (plain text protocol).

Vulnerable / tested versions:
The system tested was the MICROCONTROL 4 emergency light system.

Vendor contact timeline:
2014-05-13: Contacted vendor through info@schrack.com, requesting encryption
keys and attaching responsible disclosure policy
2014-05-13: Reply from vendor, no encryption keys
2014-05-13: Phone call to clarify the transmission of the advisory (encryption)
2014-05-13: Sending the advisory encrypted to Schrack Technik GmbH
2014-06-03: Asking for status update
2014-06-03: Receiving information regarding patch / firmware update
2014-06-11: Asking for more details about the regarding patch / firmware update
2014-07-09: Phone call to clarify details about the regarding patch / firmware
2014-07-10: SEC Consult releases security advisory

In order to solve issue 1) and 2) install firmware 1.7.0 (937), available by
sending a mail to info@schrack.com

3) Schrack Technik GmbH is working on a patch for this vulnerability

4) For the embedded system, used by the product, SSL is not available.
Schrack Technik GmbH recommends using an own network segment for the emergency
light system.

Devices deliverd after 2014-07-01 already contain firmware 1.7.0 (937)

No workaround available.

Advisory URL:

SEC Consult Vulnerability Lab

SEC Consult
Vienna - Bangkok - Frankfurt/Main - Montreal - Singapore - Vilnius

Mooslackengasse 17, 1190 Vienna, Austria
Phone: +43 1 8903043 0
Fax: +43 1 8903043 15

Mail: research at sec-consult dot com
Web: https://www.sec-consult.com
Blog: http://blog.sec-consult.com
Twitter: https://twitter.com/sec_consult

EOF C. Kudera / @2014

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