[NT] Microsoft Windows 2003 Outlook Web Access URL Injection Vulnerability

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To: list@securiteam.com
Date: 17 Mar 2005 18:55:29 +0200

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  Microsoft Windows 2003 Outlook Web Access URL Injection Vulnerability
------------------------------------------------------------------------

SUMMARY

By using specially crafted URL an attacker can cause a user using
Microsoft's Windows 2003 Outlook Web Access (OWA) to redirect to an
arbitrary URL.

DETAILS

Vulnerable Systems:
 * Microsoft Windows 2003 Outlook Web Access ( OWA )

A vulnerability in Microsoft Windows 20003 Outlook Web Access allows
malicious attackers to redirect the login to any URL they wish. This
allows the attacker to force the user to the site of the attackers
choosing enabling the attacker to use social engineering and phishing
style of attacks.

An attacker could also use this attack to gather valid user email
addresses, by appending an obfuscated redirected URL with a encoded URL
such as
https://[owa-host]/exchweb/bin/auth/owalogon.asp?url=http://3221234342/

Proof of Concept:
1. https://[owa-host]/exchweb/bin/auth/owalogon.asp?url=http://[otherhost]
2. Click "login"
3. After the injection into the form, the source reveals:
< BODY scroll="AUTO" bgColor="#3D5FA3" text="#000000" leftMargin=0
topMargin=0>
< FORM action="/exchweb/bin/auth/owaauth.dll" method="POST"
name="logonForm" autocomplete="off">
< INPUT type="hidden" name="destination" value="http://[otherhost]">
< INPUT type="hidden" name="flags" value="0">
< TABLE id="borderTable" class="standardTable" cellSpacing=0 cellPadding=0
height="100%" width="100%" bgColor="#3D5FA3" border=0>

ADDITIONAL INFORMATION

The information has been provided by <mailto:se_cur_ity@hotmail.com>
morning_wood.

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