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TwonkyMedia Server Multiple Cross-Site Scripting Vulnerabilities
Oct 21 2009 05:20PM
Davide Canali (davide davidecanali com)
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Title: TwonkyMedia Server Multiple Cross-Site Scripting Vulnerabilities
Product: TwonkyMedia Server
Vendor: TwonkyMedia (PacketVideo Corporation), http://www.twonkymedia.com
Author: Davide Canali
E-mail: davide (at) davidecanali (dot) com
TwonkyMedia Server is a DLNA-compliant, UPnP AV-compliant software
that allows to share and stream media to hundreds of popular consumer
electronics devices. It is available for Windows, Linux, Macintosh and
for various different architectures.
TwonkyMedia Server is bundled on a variety of CE and NAS devices from
leading manufacturers, including: Buffalo LinkStation, HP Media Vault,
LaCie Ethernet Disk, Philips Streamium music players, Western Digital
TwonkyMedia Server contains multiple Cross-Site Scripting (XSS)
The TwonkyMedia web server fails to adequately sanitize user input
(HTTP request strings and form input); thus, an attacker may be able
to execute arbitrary script code in a victim's browser.
Two main vulnerabilities have been found.
The TwonkyMedia server IP address, in the following, is just denoted
A HTTP GET request at http://twonky:9000/NON-EXISTENT-PAGE results in
a 404 error page containing:
<HTML><HEAD><TITLE>404 Not Found</TITLE></HEAD><BODY><H1>Not
Found</H1>/NON-EXISTENT-PAGE was not found
on this server.</BODY></HTML>
Thus, an attacker could induce the server administrator (victim) in
clicking on a specially crafted link, pointing to:
Clicking this link, the victim loads and executes the attacker's script.
An example of this script can be:
This script allows the attacker to read all the server configuration
variables, including the administrator's username and password.
(The victim, if not already logged on the twonky media server
configuration panel, is asked for username and password)
Form inputs are not well validated, so an attacker can even run a
Stored Cross-Site Scripting. Most of the pages of the management
interface are vulnerable.
As an example, writing the following string in one of the "Content
Locations" fields in the "Sharing" setup page results in a Stored XSS,
which can be exploited by a malicious user every time the victim
visits the config page, once infected:
Directory" /><script> alert('stored!');</script><br
In this way, the page can arbitrarily and permanently be modified by
an attacker, who can inject any kind of content in it.
In addition, leveraging one of these vulnerabilities, an attacker can
modify any server configuration parameter. As an example, to modify
the administrator username and password once the victim visits the
page, it is sufficient to include a script that sends 2 requests at:
4. AFFECTED PRODUCTS
TwonkyMedia Server 4.4.17 and prior versions
TwonkyMedia Server 5.0.65 and prior versions
This vulnerability has been fixed on versions 4.4.18+, 5.0.66+, and 5.1.X.
At this date, all versions of TwonkyMedia Server are still vulnerable.
To fix the 1st vulnerability, upgrade to the latest version of
TwonkyMedia Server. Latest builds are available at:
6. DISCLOSURE TIMELINE
2009-06-01: Vendor notified
2009-06-08: Vendor response
2009-06-10: Status update from the development team
2009-06-10: Sent email stating that I'll publish the advisory once new
versions are released
2009-10-06: New releases checked; 2nd vulnerability was not fixed.
2009-10-21: No response received; release of this advisory
davide (at) davidecanali (dot) com
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