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Security Advisory - August 13, 2019

[ Updated: August 19, 2019: added CVE-2019-1224, CVE-2019-1225, CVE-2019-1181 and CVE-2019-1182 ]

Zscaler protects against 12 new vulnerabilities for Chakra Core, Microsoft Windows, Internet Explorer and Microsoft Edge.

 

 

 

Zscaler, working with Microsoft through their MAPP program, has proactively deployed protection for the following 12 vulnerabilities included in the August 2019 Microsoft security bulletins. Zscaler will continue to monitor exploits associated with all vulnerabilities in the August release and deploy additional protections as necessary. 

CVE-2019-1141 – Chakra Scripting Engine Memory Corruption Vulnerability

Severity: Critical

Affected Software

  • Microsoft Edge on Windows 10 Version 1809 for 32-bit Systems
  • Microsoft Edge on Windows 10 Version 1809 for x64-based Systems
  • Microsoft Edge on Windows 10 Version 1809 for ARM64-based Systems
  • Microsoft Edge on Windows Server 2019
  • Microsoft Edge on Windows 10 Version 1903 for 32-bit Systems
  • Microsoft Edge on Windows 10 Version 1903 for x64-based Systems
  • Microsoft Edge on Windows 10 Version 1903 for ARM64-based Systems
  • ChakraCore

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.

CVE-2019-1196 – Chakra Scripting Engine Memory Corruption Vulnerability

Severity: Critical

Affected Software

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

CVE-2019-1174 – Windows Elevation of Privilege Vulnerability

Severity: Important

Affected Software

  • Windows 10 Version 1809 for 32-bit Systems
  • Windows 10 Version 1809 for x64-based Systems
  • Windows 10 Version 1809 for ARM64-based Systems
  • Windows Server 2019
  • Windows Server 2019 (Server Core installation)
  • Windows 10 Version 1903 for 32-bit Systems
  • Windows 10 Version 1903 for x64-based Systems
  • Windows 10 Version 1903 for ARM64-based Systems
  • Windows Server, version 1903 (Server Core installation)

An elevation of privilege vulnerability exists in the way that the PsmServiceExtHost.dll handles objects in memory. An attacker who successfully exploited the vulnerability could execute code with elevated permissions. To exploit the vulnerability, a locally authenticated attacker could run a specially crafted application. The security update addresses the vulnerability by ensuring the PsmServiceExtHost.dll properly handles objects in memory.

CVE-2019-1140 – Chakra Scripting Engine Memory Corruption Vulnerability

Severity: Critical

Affected Software

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

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.

CVE-2019-1195 – Chakra Scripting Engine Memory Corruption Vulnerability

Severity: Critical

Affected Software

  • ChakraCore
  • Microsoft Edge on Windows 10 Version 1703 for 32-bit Systems
  • Microsoft Edge on Windows 10 Version 1703 for x64-based Systems
  • Microsoft Edge on Windows 10 Version 1803 for 32-bit Systems
  • Microsoft Edge on Windows 10 Version 1803 for x64-based Systems
  • Microsoft Edge on Windows 10 Version 1803 for ARM64-based Systems
  • Microsoft Edge on Windows 10 Version 1809 for 32-bit Systems
  • Microsoft Edge on Windows 10 Version 1809 for x64-based Systems
  • Microsoft Edge on Windows 10 Version 1809 for ARM64-based Systems
  • Microsoft Edge on Windows Server 2019
  • Microsoft Edge on Windows 10 Version 1709 for 32-bit Systems
  • Microsoft Edge on Windows 10 Version 1709 for 64-based Systems
  • Microsoft Edge on Windows 10 Version 1709 for ARM64-based Systems
  • Microsoft Edge on Windows 10 Version 1903 for 32-bit Systems
  • Microsoft Edge on Windows 10 Version 1903 for x64-based Systems
  • Microsoft Edge on Windows 10 Version 1903 for ARM64-based Systems
  • Microsoft Edge on Windows 10 Version 1607 for 32-bit Systems
  • Microsoft Edge on Windows 10 Version 1607 for x64-based Systems
  • Microsoft Edge 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. The security update addresses the vulnerability by modifying how the Chakra scripting engine handles objects in memory.

CVE-2019-1184 – Windows Elevation of Privilege Vulnerability

Severity: Important

Affected Software

  • Windows 10 Version 1803 for 32-bit Systems
  • Windows 10 Version 1803 for ARM64-based Systems
  • Windows 10 Version 1803 for x64-based Systems
  • Windows 10 Version 1809 for 32-bit Systems
  • Windows 10 Version 1809 for ARM64-based Systems
  • Windows 10 Version 1809 for x64-based Systems
  • Windows 10 Version 1903 for 32-bit Systems
  • Windows 10 Version 1903 for ARM64-based Systems
  • Windows 10 Version 1903 for x64-based Systems
  • Windows Server 2019
  • Windows Server 2019 (Server Core installation)
  • Windows Server, version 1803 (Server Core Installation)
  • Windows Server, version 1903 (Server Core installation)

An elevation of privilege vulnerability exists when Windows Core Shell COM Server Registrar improperly handles COM calls. An attacker who successfully exploited this vulnerability could potentially set certain items to run at a higher level and thereby elevate permissions. 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 unprotected COM calls.

CVE-2019-1139 – Chakra Scripting Engine Memory Corruption Vulnerability

Severity: Critical

Affected Software

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

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.

CVE-2019-1197 – Chakra Scripting Engine Memory Corruption Vulnerability

Severity: Critical

Affected Software

  • ChakraCore
  • Microsoft Edge on Windows 10 Version 1703 for 32-bit Systems
  • Microsoft Edge on Windows 10 Version 1703 for x64-based Systems
  • Microsoft Edge on Windows 10 Version 1803 for 32-bit Systems
  • Microsoft Edge on Windows 10 Version 1803 for x64-based Systems
  • Microsoft Edge on Windows 10 Version 1803 for ARM64-based Systems
  • Microsoft Edge on Windows 10 Version 1809 for 32-bit Systems
  • Microsoft Edge on Windows 10 Version 1809 for x64-based Systems
  • Microsoft Edge on Windows 10 Version 1809 for ARM64-based Systems
  • Microsoft Edge on Windows Server 2019
  • Microsoft Edge on Windows 10 Version 1709 for 32-bit Systems
  • Microsoft Edge on Windows 10 Version 1709 for 64-based Systems
  • Microsoft Edge on Windows 10 Version 1709 for ARM64-based Systems
  • Microsoft Edge on Windows 10 Version 1903 for 32-bit Systems
  • Microsoft Edge on Windows 10 Version 1903 for x64-based Systems
  • Microsoft Edge on Windows 10 Version 1903 for ARM64-based Systems
  • Microsoft Edge on Windows 10 for 32-bit Systems
  • Microsoft Edge on Windows 10 for x64-based Systems
  • Microsoft Edge on Windows 10 Version 1607 for 32-bit Systems
  • Microsoft Edge on Windows 10 Version 1607 for x64-based Systems
  • Microsoft Edge 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. The security update addresses the vulnerability by modifying how the Chakra scripting engine handles objects in memory.

CVE-2019-1224 – Remote Desktop Protocol Server Information Disclosure Vulnerability. [ Updated: August 19, 2019] 

Severity: Important

Affected Software

  • Windows 10 Version 1803 for 32-bit Systems
  • Windows 10 Version 1803 for ARM64-based Systems
  • Windows 10 Version 1803 for x64-based Systems
  • Windows 10 Version 1809 for 32-bit Systems
  • Windows 10 Version 1809 for ARM64-based Systems
  • Windows 10 Version 1809 for x64-based Systems
  • Windows 10 Version 1903 for 32-bit Systems
  • Windows 10 Version 1903 for ARM64-based Systems
  • Windows 10 Version 1903 for x64-based Systems
  • Windows Server 2019
  • Windows Server 2019 (Server Core installation
  • Windows Server, version 1803 (Server Core Installation)
  • Windows Server, version 1903 (Server Core installation)

An information disclosure vulnerability exists when the Windows RDP server improperly discloses the contents of its memory. An attacker who successfully exploited this vulnerability could obtain information to further compromise the system. To exploit this vulnerability, an attacker would have to connect remotely to an affected system and run a specially crafted application. The security update addresses the vulnerability by correcting how the Windows RDP server initializes memory.

CVE-2019-1225 – Remote Desktop Protocol Server Information Disclosure Vulnerability [ Updated: August 19, 2019] 

Severity: Important

Affected Software

  • Windows 10 Version 1803 for 32-bit Systems
  • Windows 10 Version 1803 for ARM64-based Systems
  • Windows 10 Version 1803 for x64-based Systems
  • Windows 10 Version 1809 for 32-bit Systems
  • Windows 10 Version 1809 for ARM64-based Systems
  • Windows 10 Version 1809 for x64-based Systems
  • Windows 10 Version 1903 for 32-bit Systems
  • Windows 10 Version 1903 for ARM64-based Systems
  • Windows 10 Version 1903 for x64-based Systems
  • Windows Server 2019
  • Windows Server 2019 (Server Core installation)
  • Windows Server, version 1803 (Server Core Installation)
  • Windows Server, version 1903 (Server Core installation)

An information disclosure vulnerability exists when the Windows RDP server improperly discloses the contents of its memory. An attacker who successfully exploited this vulnerability could obtain information to further compromise the system. To exploit this vulnerability, an attacker would have to connect remotely to an affected system and run a specially crafted application. The security update addresses the vulnerability by correcting how the Windows RDP server initializes memory.

CVE-2019-1181 – Remote Desktop Services Remote Code Execution Vulnerability [ Updated: August 19, 2019]

Severity: Critical

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 1709 for ARM64-based Systems
  • Windows 10 Version 1803 for 32-bit Systems
  • Windows 10 Version 1803 for ARM64-based Systems
  • Windows 10 Version 1803 for x64-based Systems
  • Windows 10 Version 1809 for 32-bit Systems
  • Windows 10 Version 1809 for ARM64-based Systems
  • Windows 10 Version 1809 for x64-based Systems
  • Windows 10 Version 1903 for 32-bit Systems
  • Windows 10 Version 1903 for ARM64-based Systems
  • Windows 10 Version 1903 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 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 1803 (Server Core Installation)
  • Windows Server version 1903 (Server Core installation)

A remote code execution vulnerability exists in Remote Desktop Services – formerly known as Terminal Services – when an unauthenticated attacker connects to the target system using RDP and sends specially crafted requests. This vulnerability is pre-authentication and requires no user interaction. An attacker who successfully exploited this vulnerability could execute arbitrary code on the target system. 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 need to send a specially crafted request to the target systems Remote Desktop Service via RDP. The update addresses the vulnerability by correcting how Remote Desktop Services handles connection requests.

CVE-2019-1182 – Remote Desktop Services Remote Code Execution Vulnerability [ Updated: August 19, 2019]

Severity: Critical

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 1709 for ARM64-based Systems
  • Windows 10 Version 1803 for 32-bit Systems
  • Windows 10 Version 1803 for ARM64-based Systems
  • Windows 10 Version 1803 for x64-based Systems
  • Windows 10 Version 1809 for 32-bit Systems
  • Windows 10 Version 1809 for ARM64-based Systems
  • Windows 10 Version 1809 for x64-based Systems
  • Windows 10 Version 1903 for 32-bit Systems
  • Windows 10 Version 1903 for ARM64-based Systems
  • Windows 10 Version 1903 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 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 1803 (Server Core Installation)
  • Windows Server, version 1903 (Server Core installation)

A remote code execution vulnerability exists in Remote Desktop Services – formerly known as Terminal Services – when an unauthenticated attacker connects to the target system using RDP and sends specially crafted requests. This vulnerability is pre-authentication and requires no user interaction. An attacker who successfully exploited this vulnerability could execute arbitrary code on the target system. 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 need to send a specially crafted request to the target systems Remote Desktop Service via RDP. The update addresses the vulnerability by correcting how Remote Desktop Services handles connection requests.