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November 14, 2019
CBI Security Alert: Internet Explorer Zero Day Exploit

Microsoft Internet Explorer has a Zero Day exploit that is already being taken advantage of. See below for details and remediation. 

Affected Environments
All Windows Servers and Workstations

Error Details
CVE-2019-1429 | Scripting Engine Memory Corruption Vulnerability

Security Vulnerability
MITRE CVE-2019-1429

A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited the vulnerability could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

In a web-based attack scenario, an attacker could host a specially crafted website that is designed to exploit the vulnerability through Internet Explorer and then convince a user to view the website. An attacker could also embed an ActiveX control marked “safe for initialization” in an application or Microsoft Office document that hosts the IE rendering engine. The attacker could also take advantage of compromised websites and websites that accept or host user-provided content or advertisements. These websites could contain specially crafted content that could exploit the vulnerability.

The security update addresses the vulnerability by modifying how the scripting engine handles objects in memory.

Cause of Issue
Microsoft Bug

Remediation
Using BigFix, patch your environment with MS19-NOV: Cumulative security update for Internet Explorer or MS19-NOV: Cumulative Update for Windows Server 2016 or MS19-NOV: Security Only Quality Update – Security Only for 2012 and 2008

Please contact CBI MSS for more information or remediation assistance.

About the Author
Troy Jessee
Troy Jessee
BigFix Architect
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