[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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