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Category:   Application (Generic)  >   Microsoft SharePoint Vendors:   Microsoft
Microsoft SharePoint Input Validation Flaws Let Remote Users Conduct Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1040150
SecurityTracker URL:  http://securitytracker.com/id/1040150
CVE Reference:   CVE-2018-0789, CVE-2018-0790   (Links to External Site)
Date:  Jan 10 2018
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2010 SP2, 2013 SP1, 2016; SharePoint Foundation 2010 SP2
Description:   Two vulnerabilities were reported in Microsoft SharePoint. 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-2018-0789]. 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 SharePoint 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. Versions 2010 SP2, 2013 SP1, and 2016 are affected.

The software does not properly filter HTML code from user-supplied input before displaying the input [CVE-2018-0790]. 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 SharePoint 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. Versions 2010 SP2, 2013 SP1, 2016, and SharePoint Foundation 2010 SP2 are affected.

Impact:   A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the Microsoft SharePoint 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-2018-0789
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0790

Vendor URL:  portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-0789 (Links to External Site)
Cause:   Input validation error
Underlying OS:  Windows (2008), Windows (2012)

Message History:   None.


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