Microsoft out of band Zero-Day IE Patch – CVE-2019-1367 & CVE-2019-1367

 In Security Alerts

SYSTEMS AFFECTED

  • Internet Explorer
  • Windows Defender

THREAT LEVEL

  • Critical

OVERVIEW

Microsoft released two out of band patches today for critical security vulnerabilities. The first one is for a Zero-Day vulnerability in Internet Explorer. The vulnerability is tracked as CVE-2019-1367. The Second patch (CVE-2019-1255) is in Windows Defender, and is a Denial of Service vulnerability. The security patch released today by Microsoft addresses the security flaw by ensuring Microsoft Defender properly handles files to avoid exploitation.  To exploit the vulnerability, an attacker would first require execution on the victim system.

DESCRIPTION

CVE-2019-1367 – Scripting Engine Memory Corruption Vulnerability

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, for example, by sending an email.

The security update addresses the vulnerability by modifying how the scripting engine handles objects in memory. [1]

CVE-2019-1255 – Microsoft Defender Denial of Service Vulnerability

A denial of service vulnerability exists when Microsoft Defender improperly handles files. An attacker could exploit the vulnerability to prevent legitimate accounts from executing legitimate system binaries.

To exploit the vulnerability, an attacker would first require execution on the victim system.

The security update addresses the vulnerability by ensuring Microsoft Defender properly handles files. [2]

Cyberon CENTRY Security Operations Center
Due to the critical nature of the Internet Explorer vulnerability and that the exploit has been seen used in the wild Cyberon Security Operations Center have decided to send out a Critical Security Alert for this patch. Microsoft has also recommended all users to apply this patch as soon as it is available.

SOLUTION

  • Apply latest released patches from Microsoft.

REFERENCE

  1. https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1367
  2. https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1255

DISCLAIMER

The information provided herein is on “as is” basis, without warranty of any kind.

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