Exploit the possiblities

SquirrelMail Virtual Keyboard 0.9.1 Cross Site Scripting

SquirrelMail Virtual Keyboard 0.9.1 Cross Site Scripting
Posted Oct 5, 2010
Authored by Moritz Naumann

SquirrelMail Virtual Keyboard plugin versions 0.9.1 and suffer from a cross site scripting vulnerability.

tags | exploit, xss
MD5 | e8b43d6035a4fe0d517efefe1e2dfea7

SquirrelMail Virtual Keyboard 0.9.1 Cross Site Scripting

Change Mirror Download
Hi,

Squirrelmail plugin 'Virtual Keyboard' version 0.9.1 and lower is
vulnerable to cross site scripting (XSS).

The vkeyboard.php script fails to sanitize the value of HTTP GET
parameter 'passformname' which the script stores in a variable of the
same name and outputs (unmodified) into a HTML document later. As such,
it is possible to inject client-evaluated HTML and script code into the
output generated by the application.

For proof of concept, accessing the following location ([Base_URL]
refers to a Squirrelmail installation with a vulnerable version of the
'Virtual Keyboard' plugin) results in a javascript generated alert
windows reading 'XSS' popping up:
> [Base_URL]/plugins/vkeyboard/vkeyboard.php?passformname=%22%3E%3Cscript%3Ealert%28%27XSS%27%29;%3C/script%3E%3Cscript%3E/*%20

'Virtual Keyboard' installations can be found using this 'Google dork':
> http://google.com/search?hl=en&safe=off&filter=0&q=inurl%3A%22vkeyboard.php%22

This vulnerability was originally reported in early May 2010.
A suitable update fixing this issue, Virtual Keyboard v0.9.2 for
Squrrelmail 1.4.x, has been provided to the Squirrelmail developers and
me by Daniel Kobayashi Imori of Bastion Systems (the original developer
of this plugin) in early June 2010 and is attached to this email -
thanks Daniel. The Squirrelmail team has not yet made it to update this
plugin in their repository:
http://squirrelmail.org/plugin_view.php?id=159

So this is the first public release I am aware of.

Thanks for reading,

Moritz Naumann
--
Naumann IT Security Consulting
Samariterstr. 16
10247 Berlin
Germany

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