[NT] Microsoft Outlook Web Access Cross-Site Scripting (Technical Details, MS05-029)

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Microsoft Outlook Web Access Cross-Site Scripting (Technical Details,
MS05-029)
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SUMMARY

<http://www.microsoft.com/exchange/owa/> Microsoft Outlook Web Access is
"an optional component included in Microsoft Exchange that allows users to
access their mailboxes using a web frontend".

The Outlook Web Access module of Microsoft Exchange has been found to be
vulnerable to a cross site scripting.

DETAILS

Vulnerable Systems:
* Exchange Server version 5.5

Remote exploitation of a Cross-Site Scripting vulnerability in the Outlook
Web Access (OWA) component within version 5.5 of Microsoft's Exchange
Server allows an attacker to force to inject arbitrary script code into a
users session, possibly stealing logon credentials.

To demonstrate the vulnerability, simply embed the following encoded text
into an HTML e-mail:
< IMG SRC="jav&#X41sc&#0010;ript:alert('XSS')">

This will have the affect of popping up an alert window when the targeted
user views the mail using Outlook Web Access. This proof of concept could
easily be altered to cause the script to return authentication credentials
to an attacker controlled server.

Successful exploitation of this vulnerability would allow an attacker to
inject arbitrary script code into the Web Access session. This could allow
for the theft of authentication information, which could lead to a
compromised mail account. In order for exploitation to occur, the targeted
user would only have to view an e-mail from an attacker. As it is trivial
to spoof the source of e-mail, this vulnerability has a high potential for
widespread exploitation.

Vendor Status:
The vendor security advisory and appropriate patches are available at:
<http://www.microsoft.com/technet/security/Bulletin/MS05-029.mspx>
http://www.microsoft.com/technet/security/Bulletin/MS05-029.mspx

CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0563>
CAN-2005-0563

Disclosure Timeline:
* 04.08.05 - Initial vendor notification
* 04.08.05 - Initial vendor response
* 06.14.05 - Coordinated public disclosure

ADDITIONAL INFORMATION

The original article can be found at:
<http://www.idefense.com/application/poi/display?id=261&type=vulnerabilities> http://www.idefense.com/application/poi/display?id=261&type=vulnerabilities

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