Security Advisory AA-004: Directory Traversal Vulnerability in Sitecom Home Storage Center
Severity Rating: High
Discovery Date: July 29, 2012
Vendor Notification: July 30, 2012
Disclosure Date: September 3, 2012
Vulnerability Type=
Directory Traversal
Impact=
Severity=
Alcyon rates the severity of this vulnerability as high due to the following properties:
Products and firmware versions affected=
Risk Assessment=
An attacker can read arbitrary files, including the files that stores the administrative password.
This means an attacer could:
Vulnerability=
The CGI-script that is responsible for showing the device logs is affected by a directory traversal vulnerability that
allows an attacker to view arbitrary files.
Proof of Concept Exploit=
Paste the following URL into a web browser’s address bar to obtain the administrator’s username and password:
http://<victimIP>/cgi-bin/info.cgi?syslog&…/…/etc/sysconfig/config/webmaster.conf
Risk Mitigation=
At the time of disclosure no updated firmware version was available.
We recommend that you limit access to the devices's web management UI by utilizing proper packet filtering and/or NAT
on your router in order to limit network access to your NAS. Although this will not completely eliminate the risk of
exploitation, it becomes substantially more difficult to leverage a successful attack, because it would involve either
a compromise of another host on the victim’s local network or a client side attack that overcomes the Same Origin
Policy restrictions of the victim’s web browser.
We provide an installable package for Sitecom devices that enables browser based authentication (Basic Auth) as an
effective workaround for this and future web management UI vulnerabilities. For details refer to
http://www.alcyon.nl/blog/sitecom-nas-md-253-and-md-254-risk-mitigation/
Vendor responses=
Fixed Versions=
mitigation/
=Latest version of this advisory
http://www.alcyon.nl/advisories/aa-004/