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Category:   Application (Web Browser)  >   Microsoft Internet Explorer Vendors:   Microsoft
Microsoft Internet Explorer Policy Validation Flaw Lets Local Users Bypass User Mode Code Integrity Policy
SecurityTracker Alert ID:  1039112
SecurityTracker URL:  http://securitytracker.com/id/1039112
CVE Reference:   CVE-2017-8625   (Links to External Site)
Date:  Aug 9 2017
Impact:   Execution of arbitrary code via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 11
Description:   A vulnerability was reported in Microsoft Internet Explorer. A local user can bypass security restrictions.

A local user can run a specially crafted application to bypass Device Guard User Mode Code Integrity (UMCI) policies to run unsigned code on the target system.

[Editor's note: The vendor indicates that this can be exploited via a malicious website, but the vendor's CVSS score indicates that the attack vector is local.]

Matt Nelson (@enigma0x3) of SpecterOps and Oddvar Moe (@oddvarmoe) working for Advania AS reported this vulnerability.

Impact:   A local user can bypass UMCI policies on the target system.
Solution:   The vendor has issued a fix.

The Microsoft advisories are available at:

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8625
https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB4034660
https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB4034668
https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB4034658

Vendor URL:  portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8625 (Links to External Site)
Cause:   Access control error
Underlying OS:  Windows (Any)

Message History:   None.


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