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Microsoft Exchange Server Outlook Web Access Script Insertion
Secunia Advisory: SA20634
Release Date: 2006-06-13
Last Update: 2006-06-28
Popularity: 12,461 views

Critical:
Moderately critical
Impact: Cross Site Scripting
Where: From remote
Solution Status: Vendor Patch

Software:Microsoft Exchange Server 2000
Microsoft Exchange Server 2003

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CVE reference:CVE-2006-1193


Description:
SEC Consult has reported a vulnerability in Microsoft Exchange Server, which can be exploited by malicious people to conduct script insertion attacks.

The vulnerability is caused due to an error within the Microsoft Outlook Web Access (OWA) service when filtering e-mail messages that contain HTML tags with NULL bytes in the arguments. This can be exploited to insert arbitrary HTML and script code, which is executed in a user's browser session in context of an affected site when a malicious e-mail message is viewed.

Solution:
Apply patches.

Microsoft Exchange 2000 with Post-Service Pack 3 Update Rollup of August 2004:
http://www.microsoft.com/downloads/de...=746CE64E-3186-422B-A13B-004E7942189B

Microsoft Exchange Server 2003 SP1:
http://www.microsoft.com/downloads/de...=0E192781-847F-41C1-B32A-84218DB60942

Microsoft Exchange Server 2003 SP2:
http://www.microsoft.com/downloads/de...=C777BC9F-52B7-4F17-96C7-DAF3B9987D70

Provided and/or discovered by:
Daniel Fabian, SEC Consult.

Changelog:
2006-06-15: Added link to US-CERT vulnerability note. Added additional information from SEC Consult.
2006-06-28: Updated "Description" with additional information from SEC Consult.

Original Advisory:
MS06-029 (KB912442):
http://www.microsoft.com/technet/security/Bulletin/MS06-029.mspx

SEC Consult:
http://www.sec-consult.com/fileadmin/Advisories/20060613-0_owa_xss_noexploit.txt
http://www.sec-consult.com/fileadmin/Advisories/20060613-0_owa_xss_w_details.txt

Other References:
US-CERT VU#138188:
http://www.kb.cert.org/vuls/id/138188


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