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Category:   Application (E-mail Server)  >   Microsoft Exchange Vendors:   Microsoft
Microsoft Exchange Server Input Validation Bugs Let Remote Users Obtain Potentially Sensitive Information and Condcut Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1039320
SecurityTracker URL:  http://securitytracker.com/id/1039320
CVE Reference:   CVE-2017-11761, CVE-2017-8758   (Links to External Site)
Date:  Sep 12 2017
Impact:   Disclosure of authentication information, Disclosure of system information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): Exchange Server 2013 SP1, Exchange Server 2013 CU16, Exchange Server 2016 CU5, Exchange Server 2013 CU17, Exchange Server 2016 CU6
Description:   Two vulnerabilities were reported in Microsoft Exchange. A remote user can obtain potentially sensitive information on the target system. A remote user can conduct cross-site scripting attacks.

The software does not properly filter HTML code from user-supplied input before displaying the input [CVE-2017-8758]. 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.

A remote user can send a specially crafted Calendar-related request to cause the target server to request information from servers on the target network and disclose RFC1918 addresses on the target network to the remote user [CVE-2017-11761].

Cem Onat Karagun Kocaeli University and Zhongcheng Li (CK01) reported these vulnerabilities.

Impact:   A remote user can obtain potentially sensitive internal network IP address 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 advisories are available at:

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11761
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8758

Vendor URL:  portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8758 (Links to External Site)
Cause:   Access control error, Input validation error
Underlying OS:  Windows (Any)

Message History:   None.


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