Microsoft Outlook Web Access Input Validation Hole in IMG Tags Permits Cross-Site Scripting Attacks
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SecurityTracker Alert ID: 1014199 |
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SecurityTracker URL: http://securitytracker.com/id/1014199
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CVE Reference:
CAN-2005-0563
(Links to External Site)
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Date: Jun 14 2005
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Impact:
Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): OWA for Exchange Server 5.5
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Description:
An input validation vulnerability was reported in Microsoft Outlook Web Access. A remote user can conduct cross-site scripting attacks.
The software does not properly validate HTML IMG tags. A remote user can create a specially crafted tag that, when viewed by a target user, will cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the site running the Outlook Web Access software and will run in the security context of that site. As a result, the code will be able to access the target user's cookies (including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.
A demonstration exploit is provided:
<IMG SRC="javAsc
ript:alert('XSS')">
The vendor was notified on April 8, 2005.
Microsoft credits Gael Delalleau and iDEFENSE with reporting this vulnerability.
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Impact:
A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the Outlook Web Access software, access data recently submitted by the target user via web form to the site, or take actions on the site acting as the target user.
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Solution:
The vendor has issued the following fix:
For Microsoft Exchange Server 5.5 Service Pack 4:
http://www.microsoft.com/downloads/details.aspx?familyid=08435B77-9F3A-40F5-B13A-A7019CB1C244
A restart is not required.
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Vendor URL: www.microsoft.com/technet/security/Bulletin/MS05-029.mspx (Links to External Site)
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Cause:
Input validation error
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Underlying OS:
Windows (2000)
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Message History:
None.
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Source Message Contents
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Date: Tue, 14 Jun 2005 13:18:55 -0400
Subject: http://www.microsoft.com/technet/security/Bulletin/MS05-029.mspx
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http://www.microsoft.com/technet/security/Bulletin/MS05-029.mspx
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