Zscaler protects against 11 new vulnerabilities for Internet Explorer, Microsoft Edge, Microsoft Windows, Microsoft Office, Microsoft Office Services and Web Apps, Microsoft Exchange Server.

Zscaler, working with Microsoft through their MAPP program, has proactively deployed protection for the following 11 vulnerabilities included in the July 2017 Microsoft security bulletins. Zscaler will continue to monitor exploits associated with all vulnerabilities in the July release and deploy additional protections as necessary. 

CVE-2017-0243 – Microsoft Office Remote Code Execution Vulnerability

Severity: Important
Affected Software

• Microsoft Office 2007 Service Pack 3
• Microsoft Office 2010 Service Pack 2 (32-bit editions)
• Microsoft Office 2010 Service Pack 2 (64-bit editions)
• Microsoft Office Web Apps 2010 Service Pack 2
• Microsoft Business Productivity Servers 2010 Service Pack 2
• Microsoft Office 2007 Service Pack 2

A remote code execution vulnerability exists in Microsoft Office software when it fails to properly handle objects in memory. An attacker who successfully exploited the vulnerability could use a specially crafted file to perform actions in the security context of the current user. For example, the file could then take actions on behalf of the logged-on user with the same permissions as the current user. Exploitation of this vulnerability requires that a user open a specially crafted file with an affected version of Microsoft Office software. In an email attack scenario, an attacker could exploit the vulnerability by sending the specially crafted file to the user and convincing the user to open the file. In a web-based attack scenario, an attacker could host a website (or leverage a compromised website that accepts or hosts user-provided content) that contains a specially crafted file that is designed to exploit the vulnerability. However, an attacker would have no way to force the user to visit the website. Instead, an attacker would have to convince the user to click a link, typically by way of an enticement in an email or Instant Messenger message, and then convince the user to open the specially crafted file. The security update addresses the vulnerability by correcting how Microsoft Office handles files in memory.

CVE-2017-8577 – 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 R2 for x64-based Systems Service Pack 1 (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 for 32-bit Systems Service Pack 2 (Server Core installation)
• Windows Server 2012
• Windows Server 2012 (Server Core installation)
• Windows 8.1 for 32-bit systems
• Windows 8.1 for x64-based systems
• Windows Server 2012 R2
• Windows RT 8.1
• Windows Server 2012 R2 (Server Core installation)
• Windows 10 for 32-bit Systems
• Windows 10 for x64-based Systems
• Windows 10 Version 1511 for x64-based Systems
• Windows 10 Version 1511 for 32-bit Systems
• Windows Server 2016
• Windows 10 Version 1607 for 32-bit Systems
• Windows 10 Version 1607 for x64-based Systems
• Windows Server 2016  (Server Core installation)
• Windows 10 Version 1703 for 32-bit Systems
• Windows 10 Version 1703 for x64-based Systems
• Windows Server 2008 for Itanium-Based Systems Service Pack 2
• Windows Server 2008 for 32-bit 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)

An elevation of privilege vulnerability exists in Windows when the Microsoft Graphics 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 the Microsoft Graphics Component handles objects in memory.

CVE-2017-8580 – 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 R2 for x64-based Systems Service Pack 1 (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 for 32-bit Systems Service Pack 2 (Server Core installation)
• Windows Server 2012
• Windows Server 2012 (Server Core installation)
• Windows 8.1 for 32-bit systems
• Windows 8.1 for x64-based systems
• Windows Server 2012 R2
• Windows RT 8.1
• Windows Server 2012 R2 (Server Core installation)
• Windows 10 for 32-bit Systems
• Windows 10 for x64-based Systems
• Windows 10 Version 1511 for x64-based Systems
• Windows 10 Version 1511 for 32-bit Systems
• Windows Server 2016
• Windows 10 Version 1607 for 32-bit Systems
• Windows 10 Version 1607 for x64-based Systems
• Windows Server 2016  (Server Core installation)
• Windows 10 Version 1703 for 32-bit Systems
• Windows 10 Version 1703 for x64-based Systems
• Windows Server 2008 for Itanium-Based Systems Service Pack 2
• Windows Server 2008 for 32-bit 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)

An elevation of privilege vulnerability exists in Windows when the Microsoft Graphics 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 the Microsoft Graphics Component handles objects in memory.

CVE-2017-8592 – Microsoft Browser Security Feature Bypass

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 R2 for x64-based Systems Service Pack 1 (Server Core installation)
• Windows Server 2008 R2 for x64-based Systems Service Pack 1
• Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
• Internet Explorer 9 on Windows Server 2008 for 32-bit Systems Service Pack 2
• Windows Server 2012
• Windows Server 2012 (Server Core installation)
• Windows 8.1 for 32-bit systems
• Windows 8.1 for x64-based systems
• Windows Server 2012 R2
• Windows RT 8.1
• Internet Explorer 11 on Windows 7 for 32-bit Systems Service Pack 1
• Internet Explorer 11 on Windows 7 for x64-based Systems Service Pack 1
• Internet Explorer 11 on Windows Server 2008 R2 for x64-based Systems Service Pack 1
• Internet Explorer 11 on Windows 8.1 for 32-bit systems
• Internet Explorer 11 on Windows 8.1 for x64-based systems
• Internet Explorer 11 on Windows Server 2012 R2
• Internet Explorer 11 on Windows RT 8.1
• Internet Explorer 11 on Windows 10 for 32-bit Systems
• Internet Explorer 11 on Windows 10 for x64-based Systems
• Internet Explorer 11 on Windows 10 Version 1511 for x64-based Systems
• Internet Explorer 11 on Windows 10 Version 1511 for 32-bit Systems
• Internet Explorer 11 on Windows Server 2016
• Internet Explorer 11 on Windows 10 Version 1607 for 32-bit Systems
• Internet Explorer 11 on Windows 10 Version 1607 for x64-based Systems
• Internet Explorer 11 on Windows 10 Version 1703 for 32-bit Systems
• Internet Explorer 11 on Windows 10 Version 1703 for x64-based Systems
• Windows Server 2012 R2 (Server Core installation)
• Internet Explorer 10 on Windows Server 2012
• Microsoft Edge on Windows 10 for 32-bit Systems
• Microsoft Edge on Windows 10 for x64-based Systems
• Microsoft Edge on Windows 10 Version 1511 for x64-based Systems
• Microsoft Edge on Windows 10 Version 1511 for 32-bit Systems
• Windows 10 for 32-bit Systems
• Windows 10 for x64-based Systems
• Windows 10 Version 1511 for x64-based Systems
• Windows 10 Version 1511 for 32-bit Systems
• Windows Server 2016
• Windows 10 Version 1607 for 32-bit Systems
• Windows 10 Version 1607 for x64-based Systems
• Windows Server 2016  (Server Core installation)
• Windows Server 2008 for Itanium-Based Systems Service Pack 2
• Windows Server 2008 for 32-bit 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)

A security feature bypass vulnerability exists when Microsoft Browsers improperly handle redirect requests. This vulnerability allows Microsoft Browsers to bypass CORS redirect restrictions and to follow redirect requests that should otherwise be ignored. An attacker who successfully exploited this vulnerability could force the browser to send data that would otherwise be restricted to a destination web site of their choice. In a web-based attack scenario, an attacker could host a specially crafted website that is designed to exploit the vulnerability through Microsoft browsers 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 affected Microsoft Browsers handle redirect requests.

CVE-2017-8594 – Internet Explorer Memory Corruption Vulnerability

Severity: Critical
Affected Software

• Internet Explorer 11 on Windows 8.1 for 32-bit systems
• Internet Explorer 11 on Windows 8.1 for x64-based systems
• Internet Explorer 11 on Windows Server 2012 R2
• Internet Explorer 11 on Windows RT 8.1

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. In all cases, however, an attacker would have no way to force users to view the attacker-controlled content. Instead, an attacker would have to convince users to take action, typically by an enticement in an email or instant message, or by getting them to open an attachment sent through email. The security update addresses the vulnerability by modifying how Internet Explorer handles objects in memory.

CVE-2017-8598 – Scripting Engine Memory Corruption Vulnerability

Severity: Critical
Affected Software

• Microsoft Edge on Windows 10 Version 1511 for x64-based Systems
• Microsoft Edge on Windows 10 Version 1511 for 32-bit 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

A remote code execution vulnerability exists in the way Microsoft Edge handles 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, 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. In addition, an attacker could embed an ActiveX control marked "safe for initialization" in an application or Microsoft Office document that hosts the browser rendering engine. Finally, the attacker could 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 Microsoft Edge handles objects in memory.

CVE-2017-8601 –  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 10 Version 1511 for x64-based Systems
• Microsoft Edge on Windows 10 Version 1511 for 32-bit 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

A remote code execution vulnerability exists in the way that the Chakra JavaScript engine renders when handling 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.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. An attacker could also embed an ActiveX control marked "safe for initialization" in an application or Microsoft Office document that hosts the Edge 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. 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. The update addresses the vulnerability by modifying how the Chakra JavaScript scripting engine handles objects in memory.

CVE-2017-8605 –  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 10 Version 1511 for x64-based Systems
• Microsoft Edge on Windows 10 Version 1511 for 32-bit 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

A remote code execution vulnerability exists in the way Microsoft Edge handles 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, 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. In addition, an attacker could embed an ActiveX control marked "safe for initialization" in an application or Microsoft Office document that hosts the browser rendering engine. Finally, the attacker could 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 Microsoft Edge handles objects in memory.

CVE-2017-8617 – Microsoft Edge Remote Code Execution Vulnerability

Severity: Critical
Affected Software

• Microsoft Edge on Windows 10 Version 1703 for 32-bit Systems
• Microsoft Edge on Windows 10 Version 1703 for x64-based Systems

A remote code execution vulnerability exists in the way Microsoft Edge handles 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, 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. In addition, an attacker could embed an ActiveX control marked "safe for initialization" in an application or Microsoft Office document that hosts the browser rendering engine. Finally, the attacker could 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 Microsoft Edge handles objects in memory.

CVE-2017-8618 – Scripting Engine Memory Corruption Vulnerability

Severity: Critical
Affected Software

• Internet Explorer 9 on Windows Server 2008 for 32-bit Systems Service Pack 2
• Internet Explorer 9 on Windows Server 2008 for x64-based Systems Service Pack 2
• Internet Explorer 11 on Windows 7 for 32-bit Systems Service Pack 1
• Internet Explorer 11 on Windows 7 for x64-based Systems Service Pack 1
• Internet Explorer 11 on Windows Server 2008 R2 for x64-based Systems Service Pack 1
• Internet Explorer 11 on Windows 8.1 for 32-bit systems
• Internet Explorer 11 on Windows 8.1 for x64-based systems
• Internet Explorer 11 on Windows Server 2012 R2
• Internet Explorer 11 on Windows RT 8.1
• Internet Explorer 11 on Windows 10 for 32-bit Systems
• Internet Explorer 11 on Windows 10 for x64-based Systems
• Internet Explorer 11 on Windows 10 Version 1511 for x64-based Systems
• Internet Explorer 11 on Windows 10 Version 1511 for 32-bit Systems
• Internet Explorer 11 on Windows Server 2016
• Internet Explorer 11 on Windows 10 Version 1607 for 32-bit Systems
• Internet Explorer 11 on Windows 10 Version 1607 for x64-based Systems
• Internet Explorer 11 on Windows 10 Version 1703 for 32-bit Systems
• Internet Explorer 11 on Windows 10 Version 1703 for x64-based Systems
• Internet Explorer 10 on Windows Server 2012

A remote code execution vulnerability exists in the way that the VBScript engine, when rendered in Internet Explorer, handles objects in memory. In a web-based attack scenario, an attacker could host a specially crafted website that is designed to exploit this 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 Internet Explorer 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 this vulnerability. An attacker who successfully exploited this 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 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. The update addresses the vulnerability by modifying how the VBScript scripting engine handles objects in memory.

CVE-2017-8619 – 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 10 Version 1511 for x64-based Systems
• Microsoft Edge on Windows 10 Version 1511 for 32-bit 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

A remote code execution vulnerability exists in the way Microsoft Edge handles 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, 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. In addition, an attacker could embed an ActiveX control marked "safe for initialization" in an application or Microsoft Office document that hosts the browser rendering engine. Finally, the attacker could 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 Microsoft Edge handles objects in memory.