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Code Injection Vulnerabilities in WebcamXP Chat Feature
From: Frame4 Security Systems <webmaster () frame4 com>
Date: 2 May 2003 19:03:09 -0000



===========================================================================
====
FRAME4 SECURITY ADVISORY [FSA-2003:002]
---------------------------------------------------------------------------
----

PRODUCT            : WebcamXP
PRODUCT/VENDOR URL : http://www.darkwet.net/
TYPE               : Vulnerability / Exploit
IMPACT             : Medium
SUMMARY            : Code Injection Vulnerabilities in WebcamXP Chat 
Feature
DISCOVERY DATE     : 00/03/2003
PUBLIC RELEASE     : 02/05/2003
AFFECTED VERSION(S): All (as of discovery date)
FIXED VERSION(S)   : None
VENDOR NOTIFIED    : Yes

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----

BACKGROUNDER:

Vendor web site states that WebcamXP is a "powerful webcam utility with an
integrated http server so you don't need to install a web server on your
computer. Works under all windows os and the server port can be changed."

INTRODUCTION:

We have discovered various code injection vulnerabilities in the chat 
feature
of WebcamXP.

ADVISORY URL:

This advisory is available in its original format at the following URL:
http://www.frame4.com/content/advisories/FSA-2003-002.txt

VENDOR CONTACT:

We have emailed the creator of the program, "wet", on wet () darkwet net with 
the
specifics of this vulnerability on the release date of this advisory.

VULNERABILITY DESCRIPTION:

Please refer to the 'Technical Description' section below, for full 
description
of the problem(s).

VULNERABLE APPLICATION(S)/PACKAGE(S)/VERSION(S):

We have tested these vulnerabilities between two versions; v1.02.432 and 
the
latest build, v1.02.535. Whereas the chatbox feature on the application 
side
seems to be pretty immune to code injection (MOST code gets stripped), the 
web
page portion is far from being safe.

Although the tests have been carried out between two builds of the 
program, it
is highly possible that other versions behave the same way. The tests were 
only
carried out using Microsoft Internet Explorer.

SOLUTION/VENDOR INFORMATION/WORKAROUND:

None as yet. Although recently the server portion of the chat feature has 
been
upgraded (where certain tags get filtered), the problems still seem to 
exist.

TECHNICAL DESCRIPTION - EXPLOIT/CONCEPT CODE:

The below examples are merely a small portion of what could be possible 
and in
no way constitute an exhaustive list of potential vulnerabilities.

[001] Code Injection 1

We have ascertained that typing &lt;script&gt;alert(document.cookie);&lt;/script&gt; 
in the
message field on the web page generates a message box whereas this should 
be
ignored. You can see an actual screen shot of this at the following URL:
http://www.frame4.com/content/advisories/FSA-2003-002-01.jpg

[002] Code Injection 2

Following on from the previous example, we have also noticed that in a 
similar
manner, an IFRAME can be generated by simply typing the 
following 'command' in
the message field: <iframe src="http://frame4.com";></iframe>. You can find 
the
relevant screen shots of this 'feature' at the following URLs:
http://www.frame4.com/content/advisories/FSA-2003-002-01.jpg
http://www.frame4.com/content/advisories/FSA-2003-002-02.jpg
http://www.frame4.com/content/advisories/FSA-2003-002-03.jpg

[003] Code Injection 3

This is the "showstopper". We have discovered that the IFRAME can 
be "pushed"
onto the chat initiator in the same fashion. In this case, a webcam 
operator
for example, can inject a script "out" to the user via the internal chat 
box.
A screen shot of this problem can be seen here:
http://www.frame4.com/content/advisories/FSA-2003-002-04.jpg

[004] "Malformed Code" Injection

Whereas the command <iframe src="http://frame4.com";></iframe> creates a 
perfect
IFRAME (see above), if we issue (by accident) the same command in 
the "wrong"
manner, i.e.:

&lt;script&gt;alert(document.cookie);&lt;/script&gt;<iframe 
src=http://frame4.com</iframe>

the page goes into some kind of 'loop'. The message box gets generated and 
then
we DO get an IFRAME (and rightly, you get an 404 as the content) but the 
scroll
bars disappear and the page just stops responding.

Closing the browser and re-opening at the chat URL has absolutely no 
effect, as
the above loop gets repeated and the situation does not change until the 
other
party resets or refreshes their page. A screen shot of this problem can be 
seen
here: http://www.frame4.com/content/advisories/FSA-2003-002-05.jpg

CREDITS:

The vulnerabilities outlined in this advisory and accompanying sample code 
have
been discovered by a joint operation between Morning Wood and Anthony 
Aykut. We
have NOT circulated any of our findings through the underground community, 
and,
present them here as a PUBLIC DISCLOSURE.

Morning Wood
morning_wood () thepub co za
Morning Wood, Inc
http://take.candyfrom.us/

Anthony Aykut
anthony.aykut () frame4 com
Frame4 Security Systems
http://www.frame4.com

REFERENCES:

None.

ABOUT:

Frame4 Security Systems is a new security partner, empowering clients with 
the
necessary knowledge and products to protect and secure their computer 
systems.

Headquartered in The Netherlands, Frame4 can be reached at +31(0)172-
515901 or
on the Web at http://www.frame4.com/.

DISCLAIMER:

This advisory is a Frame4 Security Systems ("Frame4") publication, all 
rights
reserved (c) 2003. You may (re-)distribute the text as long as the content 
is
not changed in any way and with this header text intact. If you want to 
serve
this paper on your web site/FTP/Newsgroup/etc., we encourage you to do so, 
as
long as no changes are made without the prior permission of the author(s), 
no
fees are charged and proper credit is given.

IMPORTANT -- THIS DOCUMENT IS FOR INFORMATIONAL PURPOSES ONLY. To the 
maximum
extent permitted by applicable law, in no event shall Frame4 Security 
Systems
be liable for any damages whatsoever, (including, without limitation, 
damages
for loss of any business profits, business interruption, loss of any 
business
information, or other pecuniary loss) arising out of the use, or inability 
to
use any software, and/or procedures outlined in this document, even if 
Frame4
Security Systems has been advised of the possibility of such damage(s). 
There
are NO warranties with regard to this information.

This advisory is the property of Frame4 Security Systems, all rights 
reserved.
Copyright (c) 1999-2003 Frame4 Security Systems -- http://www.frame4.com/
===========================================================================
====


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