From: Aviram Jenik (avirambeyondsecurity.com)
Date: Mon Apr 19 2004 - 07:11:21 CDT

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 Zaep AntiSpam Cross Site Scripting
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Article reference:
http://www.securiteam.com/windowsntfocus/5EP0I15CKK.html

SUMMARY

Beyond Security has discovered a security vulnerability in
<http://www.zaep.com/> Zaep AntiSpam 2.0, the vulnerability would allow a
remote attacker to use the Zaep program's CGI to cause it to return third
party content as if it were its own (A cross-site scripting vulnerability).
This vulnerability would allow (depending on the web server's configuration
and site sensitivity) to steal cookies, display alternative information
(cross-site defacement), or redirect users to malicious sites.

DETAILS

Vulnerable Systems:
 * Zaep AntiSpam 2.0

Immune Systems:
 * Zaep AntiSpam 2.0.0.2

Once you send an email to an organization protected by Zaep, a URL like:
http://vulnerable.zaep/?key=3d981f0f.4056b0a6.23285275 is issued. If you
modify the URL to include <script>something</script>, the Zaep will convert
the '/' sign to \, making the script clause not work properly. So far, this
behavior will "protect" the product from a cross-site scripting
vulnerability. However, double encoding the / sign (%252F) will bypass this
conversion, and allow you to insert malicious content (JavaScript, HTML, etc)
into the page.

Exploit (for all the vulnerabilities):
http://vulnerable.zaep/?key=<script>alert(document.cookie)<%252Fscript>

Vendor response:
The vendor has been very cooperative and has issued a patch to fix this
problem as soon as they were notified.

ADDITIONAL INFORMATION

The information has been provided by <mailto:expertsecuriteam.com> Noam
Rathaus.

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DISCLAIMER:
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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