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Security Advisory - October 09, 2018

Zscaler protects against 6 new vulnerabilities for Microsoft Exchange Server, Microsoft Windows, Internet Explorer, Microsoft Edge and ChakraCore

 

 

Zscaler, working with Microsoft through their MAPP program, has proactively deployed protection for the following 6 vulnerabilities included in the October 2018 Microsoft security bulletins. Zscaler will continue to monitor exploits associated with all vulnerabilities in the October release and deploy additional protections as necessary. 

CVE-2010-3190 – MFC Insecure Library Loading Vulnerability

Severity: Important

Affected Software

● Microsoft Exchange Server 2010 Service Pack 3

● Microsoft Exchange Server 2013

● Microsoft Exchange Server 2016

A remote code execution vulnerability exists in the way that certain applications built using Microsoft Foundation Classes (MFC) handle the loading of DLL files. An attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. The update addresses this vulnerability by correcting how applications built using MFC load DLL files.

CVE-2018-8453 – Win32k Elevation of Privilege Vulnerability

Severity: Important

Affected Software

● Windows 10 for 32-bit Systems

● Windows 10 for x64-based Systems

● Windows 10 Version 1607 for 32-bit Systems

● Windows 10 Version 1607 for x64-based Systems

● Windows 10 Version 1703 for 32-bit Systems

● Windows 10 Version 1703 for x64-based Systems

● Windows 10 Version 1709 for 32-bit Systems

● Windows 10 Version 1709 for 64-based Systems

● Windows 10 Version 1803 for 32-bit Systems

● Windows 10 Version 1803 for x64-based Systems

● Windows 10 Version 1809 for 32-bit Systems

● Windows 10 Version 1809 for x64-based Systems

● Windows 7 for 32-bit Systems Service Pack 1

● Windows 7 for x64-based Systems Service Pack 1

● Windows 8.1 for 32-bit systems

● Windows 8.1 for x64-based systems

● Windows RT 8.1

● Windows Server 2008 for 32-bit Systems Service Pack 2

● Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)

● Windows Server 2008 for Itanium-Based Systems Service Pack 2

● Windows Server 2008 for x64-based Systems Service Pack 2

● Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)

● Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1

● Windows Server 2008 R2 for x64-based Systems Service Pack 1

● Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)

● Windows Server 2012

● Windows Server 2012 (Server Core installation)

● Windows Server 2012 R2

● Windows Server 2012 R2 (Server Core installation)

● Windows Server 2016

● Windows Server 2016 (Server Core installation)

● Windows Server 2019

● Windows Server 2019 (Server Core installation)

● Windows Server, version 1709 (Server Core Installation)

● Windows Server, version 1803 (Server Core Installation)

An elevation of privilege vulnerability exists in Windows when the Win32k component fails to properly handle objects in memory. An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and take control of an affected system. The update addresses this vulnerability by correcting how Win32k handles objects in memory.

CVE-2018-8460 – Internet Explorer Memory Corruption Vulnerability

Severity: Critical

Affected Software

● Internet Explorer 11 for Windows 10 for x64-based Systems

● Internet Explorer 11 for Windows 10 Version 1703 for 32-bit Systems

● Internet Explorer 11 for Windows 10 Version 1803 for 32-bit Systems

● Internet Explorer 11 for Windows 10 Version 1803 for x64-based Systems

● Internet Explorer 11 for Windows 10 Version 1809 for 32-bit Systems

● Internet Explorer 11 for Windows 10 Version 1809 for x64-based Systems

● Internet Explorer 11 for Windows 10 Version 1809 for ARM64-based Systems

● Internet Explorer 11 for Windows Server 2019

● Internet Explorer 11 for Windows 10 Version 1709 for 32-bit Systems

● Internet Explorer 11 for Windows 10 Version 1709 for 64-based Systems

● Internet Explorer 11 for Windows 10 for 32-bit Systems

● Internet Explorer 11 for Windows 10 Version 1703 for x64-based Systems

● Internet Explorer 11 for Windows 10 Version 1607 for 32-bit Systems

● Internet Explorer 11 for Windows 10 Version 1607 for x64-based Systems

● Internet Explorer 11 for Windows Server 2016

● Internet Explorer 11 for Windows 7 for 32-bit Systems Service Pack 1

● Internet Explorer 11 for Windows 7 for x64-based Systems Service Pack 1

● Internet Explorer 11 for Windows 8.1 for 32-bit systems

● Internet Explorer 11 for Windows 8.1 for x64-based systems

● Internet Explorer 11 for Windows RT 8.1

● Internet Explorer 11 for Windows Server 2008 R2 for x64-based Systems Service Pack 1

● Internet Explorer 11 for Windows Server 2012 R2

A remote code execution vulnerability exists when Internet Explorer improperly accesses objects in memory. 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, the attacker 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. An attacker could host a specially crafted website designed to exploit the vulnerability through Internet Explorer and then convince a user to view the website. The attacker could also take advantage of compromised websites, or websites that accept or host user-provided content or advertisements, by adding specially crafted content that could exploit the vulnerability. However, in all cases an attacker would have no way to force a user to view the attacker-controlled content. Instead, an attacker would have to convince a user to take action, typically by an enticement in an email or instant message, or by getting the user to open an attachment sent through email. The security update addresses the vulnerability by modifying how Internet Explorer handles objects in memory.

CVE-2018-8491 – Internet Explorer Memory Corruption Vulnerability

Severity: Critical

Affected Software

● Internet Explorer 11 for Windows 10 for x64-based Systems

● Internet Explorer 11 for Windows 10 Version 1703 for 32-bit Systems

● Internet Explorer 11 for Windows 10 Version 1803 for 32-bit Systems

● Internet Explorer 11 for Windows 10 Version 1803 for x64-based Systems

● Internet Explorer 11 for Windows 10 Version 1809 for 32-bit Systems

● Internet Explorer 11 for Windows 10 Version 1809 for x64-based Systems

● Internet Explorer 11 for Windows 10 Version 1809 for ARM64-based Systems

● Internet Explorer 11 for Windows Server 2019

● Internet Explorer 11 for Windows 10 Version 1709 for 32-bit Systems

● Internet Explorer 11 for Windows 10 Version 1709 for 64-based Systems

● Internet Explorer 11 for Windows 10 for 32-bit Systems

● Internet Explorer 11 for Windows 10 Version 1703 for x64-based Systems

● Internet Explorer 11 for Windows 10 Version 1607 for 32-bit Systems

● Internet Explorer 11 for Windows 10 Version 1607 for x64-based Systems

● Internet Explorer 11 for Windows Server 2016

● Internet Explorer 11 for Windows 7 for 32-bit Systems Service Pack 1

● Internet Explorer 11 for Windows 7 for x64-based Systems Service Pack 1

● Internet Explorer 11 for Windows 8.1 for 32-bit systems

● Internet Explorer 11 for Windows 8.1 for x64-based systems

● Internet Explorer 11 for Windows RT 8.1

● Internet Explorer 11 for Windows Server 2008 R2 for x64-based Systems Service Pack 1

● Internet Explorer 11 for Windows Server 2012 R2

A remote code execution vulnerability exists when Internet Explorer improperly accesses objects in memory. 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, the attacker 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. An attacker could host a specially crafted website designed to exploit the vulnerability through Internet Explorer and then convince a user to view the website. The attacker could also take advantage of compromised websites, or websites that accept or host user-provided content or advertisements, by adding specially crafted content that could exploit the vulnerability. However, in all cases an attacker would have no way to force a user to view the attacker-controlled content. Instead, an attacker would have to convince a user to take action, typically by an enticement in an email or instant message, or by getting the user to open an attachment sent through email. The security update addresses the vulnerability by modifying how Internet Explorer handles objects in memory.

CVE-2018-8495 – Windows Shell Remote Code Execution Vulnerability

Severity: Important

Affected Software

● Windows 10 Version 1607 for 32-bit Systems

● Windows 10 Version 1607 for x64-based Systems

● Windows 10 Version 1703 for 32-bit Systems

● Windows 10 Version 1703 for x64-based Systems

● Windows 10 Version 1709 for 32-bit Systems

● Windows 10 Version 1709 for 64-based Systems

● Windows 10 Version 1803 for 32-bit Systems

● Windows 10 Version 1803 for x64-based Systems

● Windows Server 2016

● Windows Server 2016 (Server Core installation)

● Windows Server, version 1709 (Server Core Installation)

● Windows Server, version 1803 (Server Core Installation)

A remote code execution vulnerability exists when Windows Shell improperly handles URIs. 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 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. An attacker could host a specially crafted website that is designed to exploit the vulnerability through Microsoft Edge, and then convince a user to view the website. The attack requires specific user interaction which an attacker would need to trick the user into performing. There is no way an attacker could exploit the vulnerability without the user performing the specific action. The security update addresses the vulnerability by modifying how Windows Shell handles URIs.

CVE-2018-8505 – Chakra Scripting Engine Memory Corruption Vulnerability

Severity: Critical

Affected Software

● ChakraCore​

● Microsoft Edge for Windows Server 2016

● Microsoft Edge for Windows 10 Version 1703 for x64-based Systems

● Microsoft Edge for Windows 10 Version 1803 for 32-bit Systems

● Microsoft Edge for Windows 10 Version 1803 for x64-based Systems

● Microsoft Edge for Windows 10 Version 1809 for 32-bit Systems

● Microsoft Edge for Windows 10 Version 1809 for x64-based Systems

● Microsoft Edge for Windows 10 Version 1703 for 32-bit Systems

● Microsoft Edge for Windows Server 2019

● Microsoft Edge for Windows 10 Version 1709 for 32-bit Systems

● Microsoft Edge for Windows 10 Version 1709 for 64-based Systems

● Microsoft Edge for Windows 10 Version 1607 for 32-bit Systems

● Microsoft Edge for Windows 10 Version 1607 for x64-based Systems

● Microsoft Edge for Windows 10 Version 1809 for ARM64-based Systems

A remote code execution vulnerability exists in the way that the Chakra scripting engine handles objects in memory in Microsoft Edge. 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 Microsoft Edge and then convince a user to view the website. 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 Chakra scripting engine handles objects in memory.