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Category:   Application (Generic)  >   Microsoft SharePoint Vendors:   Microsoft
Microsoft SharePoint Bugs Let Remote Users Execute Arbitrary Code and Remote Authenticated Users Conduct Cross-Site Scripting Attacks
SecurityTracker Alert ID:  1041261
SecurityTracker URL:  http://securitytracker.com/id/1041261
CVE Reference:   CVE-2018-8299, CVE-2018-8300, CVE-2018-8323   (Links to External Site)
Date:  Jul 10 2018
Impact:   Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2013 SP1, 2016
Description:   Several vulnerabilities were reported in Microsoft SharePoint. A remote user can cause arbitrary code to be executed on the target user's system. A remote authenticated user can conduct cross-site scripting attacks.

The software does not properly filter HTML code from user-supplied input before displaying the input [CVE-2018-8299, CVE-2018-8323]. A remote authenticated 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.

A remote user can create a specially crafted project or resource file that, when loaded by the target user, will trigger an error in validating the source markup of application packages and execute arbitrary code on the target user's system [CVE-2018-8300]. The code will run with the privileges of the target user.

Soroush Dalili of NCC Group and Adrian Ivascu reported these vulnerabilities.

Impact:   A remote user can create content that, when loaded by the target user, will execute arbitrary code on the target user's system.

A remote authenticated 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-2018-8299
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8300
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8323

Vendor URL:  portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8323 (Links to External Site)
Cause:   Access control error, Input validation error
Underlying OS:  Windows (2008), Windows (2012)

Message History:   None.


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