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Category:   Application (E-mail Server)  >   Microsoft Exchange Vendors:   Microsoft
Microsoft Exchange Server Bugs Let Remote Users Obtain Potentially Sensitive Information and Conduct Cross-Site Scripting and Open Redirect Attacks
SecurityTracker Alert ID:  1036778
SecurityTracker URL:  http://securitytracker.com/id/1036778
CVE Reference:   CVE-2016-0138, CVE-2016-3378, CVE-2016-3379   (Links to External Site)
Date:  Sep 13 2016
Impact:   Disclosure of authentication information, Disclosure of system 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): 2007 SP3, 2010 SP3, 2013 SP1, 2013 CU12, 2013 CU13, 2016 CU1, 2016 CU2
Description:   Several vulnerabilities were reported in Microsoft Exchange Server. A remote user can redirect the target user's browser to an arbitrary site. A remote user can obtain potentially sensitive information on the target system. 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-2016-3378].

A remote user can use "send as" rights to send a specially crafted request to the target user to trigger an error in the parsing of unstructured files to obtain potentially sensitive information on the target system [CVE-2016-0138].

The software does not properly filter HTML code from user-supplied input in Outlook meeting invitation requests before displaying the input [CVE-2016-3379]. A remote user can 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.

Adrian Ivascu, Bassel Rachid of DH Corporation, John Page of ApparitionSec, and Lucie Brochu reported 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 obtain potentially sensitive information on the target system.

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 advisory is available at:

https://technet.microsoft.com/library/security/ms16-108

Vendor URL:  technet.microsoft.com/library/security/ms16-108 (Links to External Site)
Cause:   Access control error, Input validation error
Underlying OS:  Windows (Any)

Message History:   None.


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