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Security Advisory - October 9, 2019

Zscaler protects against 2 new vulnerabilities for ChakraCore, Microsoft Edge and Microsoft Windows

 

 

 

Zscaler, working with Microsoft through their MAPP program, has proactively deployed protection for the following 2 vulnerabilities included in the October 2019 Microsoft security bulletins. Zscaler will continue to monitor exploits associated with all vulnerabilities in the October release and deploy additional protections as necessary.

CVE-2019-1335 – Chakra Scripting Engine Memory Corruption Vulnerability

Severity: Critical

Affected Software

  • ChakraCore
  • Microsoft Edge (EdgeHTML-based)on Windows 10 Version 1703 for 32-bit Systems
  • Microsoft Edge (EdgeHTML-based)on Windows 10 Version 1703 for x64-based Systems
  • Microsoft Edge (EdgeHTML-based)on Windows 10 Version 1803 for 32-bit Systems
  • Microsoft Edge (EdgeHTML-based)on Windows 10 Version 1803 for x64-based Systems
  • Microsoft Edge (EdgeHTML-based)on Windows 10 Version 1803 for ARM64-based Systems
  • Microsoft Edge (EdgeHTML-based)on Windows 10 Version 1809 for 32-bit Systems
  • Microsoft Edge (EdgeHTML-based)on Windows 10 Version 1809 for x64-based Systems
  • Microsoft Edge (EdgeHTML-based)on Windows 10 Version 1809 for ARM64-based Systems
  • Microsoft Edge (EdgeHTML-based)on Windows Server 2019
  • Microsoft Edge (EdgeHTML-based)on Windows 10 Version 1709 for 32-bit Systems
  • Microsoft Edge (EdgeHTML-based)on Windows 10 Version 1709 for 64-based Systems
  • Microsoft Edge (EdgeHTML-based)on Windows 10 Version 1709 for ARM64-based Systems
  • Microsoft Edge (EdgeHTML-based)on Windows 10 Version 1903 for 32-bit Systems
  • Microsoft Edge (EdgeHTML-based)on Windows 10 Version 1903 for x64-based Systems
  • Microsoft Edge (EdgeHTML-based)on Windows 10 Version 1903 for ARM64-based Systems
  • Microsoft Edge (EdgeHTML-based)on Windows 10 for 32-bit Systems
  • Microsoft Edge (EdgeHTML-based)on Windows 10 for x64-based Systems
  • Microsoft Edge (EdgeHTML-based)on Windows 10 Version 1607 for 32-bit Systems
  • Microsoft Edge (EdgeHTML-based)on Windows 10 Version 1607 for x64-based Systems
  • Microsoft Edge (EdgeHTML-based)on Windows Server 2016

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.

CVE-2019-1362 – Win32k Elevation of Privilege Vulnerability

Severity: Important

Affected Software

  • Windows 7 for 32-bit Systems Service Pack 1
  • Windows 7 for x64-based Systems Service Pack 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)

An elevation of privilege vulnerability exists in Windows when the Windows kernel-mode driver 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.