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Category:   Application (E-mail Server)  >   Microsoft Exchange Vendors:   Microsoft
Microsoft Exchange Input Validation Flaws Let Remote Users Conduct Open Redirect and Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1038852
SecurityTracker URL:  http://securitytracker.com/id/1038852
CVE Reference:   CVE-2017-8559, CVE-2017-8560, CVE-2017-8621   (Links to External Site)
Date:  Jul 11 2017
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of system information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): Microsoft Exchange Server 2010 Service Pack 3, Microsoft Exchange Server 2013 Service Pack 1, Microsoft Exchange Server 2013 Cumulative Update 16, Microsoft Exchange Server 2016 Cumulative Update 5
Description:   Several vulnerabilities were reported in Microsoft Exchange. A remote user can redirect the target user's browser to an arbitrary site. A remote user can conduct cross-site scripting attacks.

A remote user can create a URL that, when loaded by the target user, will redirect the target user's browser to an arbitrary site [CVE-2017-8621].

The software does not properly filter HTML code from user-supplied input before displaying the input [CVE-2017-8559, CVE-2017-8560]. A remote user can create a specially crafted URL that, when loaded 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 Microsoft Exchange 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.

Ashar Javed @soaj1664ashar of Hyundai AutoEver Europe GmbH and Adrian Ivascu reported some of these vulnerabilities.

Impact:   A remote user can cause the target user's browser to be redirected to an arbitrary web site.

A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the Microsoft Exchange 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.

Solution:   The vendor has issued a fix.

The Microsoft advisories are available at:

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8621
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8560
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8559

Vendor URL:  portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8621 (Links to External Site)
Cause:   Input validation error
Underlying OS:  Windows (Any)

Message History:   None.


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