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Security Advisory - October 10, 2017

Zscaler protects against 8 new vulnerabilities for Scripting Engine, Win32k, Windows Shell and Internet Explorer.

 

 

Zscaler, working with Microsoft through their MAPP program, has proactively deployed protection for the following 8 vulnerabilities included in the October 2017 Microsoft security bulletins. Zscaler will continue to monitor exploits associated with all vulnerabilities in the October release and deploy additional protections as necessary. 

CVE-2017-8727 – Windows Shell Memory Corruption Vulnerability

Severity: Important

Affected Software

  • Windows 7 SP1
  • Windows Server 2008 R2
  • Windows Server 2012
  • Windows 8.1
  • Windows RT 8.1
  • Windows Server 2012 R2
  • Windows 10
  • Windows 10 version 1511
  • Windows 10 version 1607
  • Windows 10 version 1703
  • Windows Server 2016
  • Windows Server 2008

A remote code execution vulnerability exists when Internet Explorer improperly accesses objects in memory via the Microsoft Windows Text Services Framework. 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 the Microsoft Windows Text Services Framework handles objects in memory.

CVE-2017-8689 –  Win32k Elevation of Privilege Vulnerability

Severity: Important

Affected Software

  • Windows 7 SP1
  • Windows Server 2008 R2
  • Windows Server 2012
  • Windows 8.1
  • Windows RT 8.1
  • Windows Server 2012 R2
  • Windows 10
  • Windows 10 version 1511
  • Windows 10 version 1607
  • Windows 10 version 1703
  • Windows Server 2016
  • Windows Server 2008

An elevation of privilege vulnerability exists 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 to take control of an affected system. The update addresses the vulnerability by correcting how the Windows kernel-mode driver handles objects in memory.

CVE-2017-8694 – Win32k Elevation of Privilege Vulnerability

Severity: Important

Affected Software

  • Windows 7 SP1
  • Windows Server 2008 R2
  • Windows Server 2012
  • Windows 8.1
  • Windows RT 8.1
  • Windows Server 2012 R2
  • Windows 10
  • Windows 10 version 1511
  • Windows 10 version 1607
  • Windows 10 version 1703
  • Windows Server 2016
  • Windows Server 2008

An elevation of privilege vulnerability exists 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 to take control of an affected system. The update addresses the vulnerability by correcting how the Windows kernel-mode driver handles objects in memory.

CVE-2017-11793 – Scripting Engine Memory Corruption Vulnerability

Severity: Critical

Affected Software

  • Internet Explorer 9 on Windows Server 2008
  • Internet Explorer 11 on Windows 7
  • Internet Explorer 11 on Windows Server 2008 R2
  • Internet Explorer 11 on Windows 8.1
  • Internet Explorer 11 on Windows RT 8.1
  • Internet Explorer 11 on Windows Server 2012 R2
  • Internet Explorer 11 on Windows 10
  • Internet Explorer 11 on Windows 10 version 1511
  • Internet Explorer 11 on Windows 10 version 1607
  • Internet Explorer 11 on Windows 10 version 1703
  • Internet Explorer 11 on Windows Server 2016
  • Internet Explorer 10 on Windows Server 2012

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. An attacker could also embed an ActiveX control marked safe for initialization in an application or Microsoft Office document that hosts the IE 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. The security update addresses the vulnerability by modifying how the scripting engine handles objects in memory.

CVE-2017-11798 – Scripting Engine Memory Corruption Vulnerability

Severity: Critical

Affected Software

  • Microsoft Edge on Windows Server 2016
  • Microsoft Edge on Windows 10
  • Microsoft Edge on Windows 10 version 1511
  • Microsoft Edge on Windows 10 version 1607
  • Microsoft Edge on Windows 10 version 1703

A remote code execution vulnerability exists in the way that the 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 update addresses the vulnerability by modifying how the scripting engine handles objects in memory.

CVE-2017-11800 – Scripting Engine Memory Corruption Vulnerability

Severity: Critical 

Affected Software

  • Microsoft Edge on Windows Server 2016
  • Microsoft Edge on Windows 10
  • Microsoft Edge on Windows 10 version 1511
  • Microsoft Edge on Windows 10 version 1607

A remote code execution vulnerability exists in the way that the 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 update addresses the vulnerability by modifying how the scripting engine handles objects in memory.

CVE-2017-11810 – Scripting Engine Memory Corruption Vulnerability

Severity: Critical

Affected Software

  • Internet Explorer 9 on Windows Server 2008
  • Internet Explorer 11 on Windows 7
  • Internet Explorer 11 on Windows Server 2008 R2
  • Internet Explorer 11 on Windows 8.1
  • Internet Explorer 11 on Windows RT 8.1
  • Internet Explorer 11 on Windows Server 2012 R2
  • Internet Explorer 11 on Windows 10
  • Internet Explorer 11 on Windows 10 version 1511
  • Internet Explorer 11 on Windows 10 version 1607
  • Internet Explorer 11 on Windows 10 version 1703
  • Internet Explorer 11 on Windows Server 2016
  • Internet Explorer 10 on Windows Server 2012

 

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. An attacker could also embed an ActiveX control marked safe for initialization in an application or Microsoft Office document that hosts the IE 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. The security update addresses the vulnerability by modifying how the scripting engine handles objects in memory.

CVE-2017-11822 – Internet Explorer Memory Corruption Vulnerability 

Severity: Critical

Affected Software

  • Internet Explorer 9 on Windows Server 2008
  • Internet Explorer 11 on Windows 7
  • Internet Explorer 11 on Windows Server 2008 R2
  • Internet Explorer 11 on Windows 8.1
  • Internet Explorer 11 on Windows RT 8.1
  • Internet Explorer 11 on Windows Server 2012 R2
  • Internet Explorer 11 on Windows 10
  • Internet Explorer 11 on Windows 10 version 1511
  • Internet Explorer 11 on Windows 10 version 1607
  • Internet Explorer 11 on Windows 10 version 1703
  • Internet Explorer 11 on Windows Server 2016

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.