Zscaler protects against 13 new vulnerabilities for Scripting Engine & Microsoft Edge.

Zscaler, working with Microsoft through their MAPP program, has proactively deployed protection for the following 13 vulnerabilities included in the July 2018 Microsoft security bulletins. Zscaler will continue to monitor exploits associated with all vulnerabilities in the July release and deploy additional protections as necessary. 

CVE-2018-8125 – Chakra Scripting Engine Memory Corruption Vulnerability

Severity: Important

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

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-2018-8242 – 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 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 11 on Windows 10 Version 1709 for 32-bit Systems
• Internet Explorer 11 on Windows 10 Version 1709 for x64-based Systems
• Internet Explorer 11 on Windows 10 Version 1803 for 32-bit Systems
• Internet Explorer 11 on Windows 10 Version 1803 for x64-based Systems
• 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-2018-8262 – Microsoft Edge Memory Corruption Vulnerability

Severity: Critical

Affected Software

• Microsoft Edge on Windows 10 Version 1803 for 32-bit Systems
• Microsoft Edge on Windows 10 Version 1803 for x64-based Systems

A remote code execution vulnerability exists when Microsoft Edge improperly accesses objects in memory. The vulnerability could corrupt memory in such a way that enables an attacker to 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 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 attacker could also take advantage of compromised websites and 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 way of enticement in an email or Instant Messenger message, or by getting them to open an attachment sent through email.

The security update addresses the vulnerability by modifying how Microsoft Edge handles objects in memory.

CVE-2018-8275 – Microsoft Edge Memory Corruption Vulnerability

Severity: Critical

Affected Software

• 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
• ChakraCore

A remote code execution vulnerability exists when Microsoft Edge improperly accesses objects in memory. The vulnerability could corrupt memory in such a way that enables an attacker to 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 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 attacker could also take advantage of compromised websites and 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 way of enticement in an email or Instant Messenger message, or by getting them to open an attachment sent through email.

The security update addresses the vulnerability by modifying how Microsoft Edge handles objects in memory.

CVE-2018-8278 – Microsoft Edge Spoofing Vulnerability

Severity: Important

Affected Software

• Microsoft Edge on Windows 10 Version 1803 for 32-bit Systems
• Microsoft Edge on Windows 10 Version 1803 for x64-based Systems

A spoofing vulnerability exists when Microsoft Edge improperly handles specific HTML content. An attacker who successfully exploited this vulnerability could trick a user into believing that the user was on a legitimate website. The specially crafted website could either spoof content or serve as a pivot to chain an attack with other vulnerabilities in web services.

To exploit the vulnerability, the user must either browse to a malicious website or be redirected to it. In an email attack scenario, an attacker could send an email message in an attempt to convince the user to click a link to a malicious site.

In a web-based attack scenario, an attacker could host a specially crafted website designed to appear as a legitimate website to the user. However, the attacker would have no way to force the user to visit the specially crafted website. The attacker would have to convince the user to visit the specially crafted website, typically by way of enticement in an email or instant message.

The security update addresses the vulnerability by correcting how Microsoft Edge handles specific HTML content.

CVE-2018-8283 – Chakra Scripting Engine Memory Corruption Vulnerability

Severity: Critical

Affected Software

• ChakraCore

A remote code execution vulnerability exists in the way that the ChakraCore scripting engine 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.

The security update addresses the vulnerability by modifying how the ChakraCore scripting engine handles objects in memory.

CVE-2018-8288 – Scripting Engine Memory Corruption Vulnerability

Severity: Critical

Affected Software

• 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 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 11 on Windows 10 Version 1709 for 32-bit Systems
• Internet Explorer 11 on Windows 10 Version 1709 for x64-based Systems
• Internet Explorer 11 on Windows 10 Version 1803 for 32-bit Systems
• Internet Explorer 11 on Windows 10 Version 1803 for x64-based Systems
• 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
• ChakraCore

A remote code execution vulnerability exists in the way the scripting engine handles objects in memory in Microsoft browsers. 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 designed to exploit the vulnerability through a Microsoft browser 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 browser 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-2018-8289 – Microsoft Edge Information Disclosure Vulnerability

Severity: Important

Affected Software

• Microsoft Edge on Windows 10 Version 1803 for 32-bit Systems
• Microsoft Edge on Windows 10 Version 1803 for x64-based Systems

An information disclosure vulnerability exists when Microsoft Edge improperly handles objects in memory. An attacker who successfully exploited the vulnerability could obtain information to further compromise the user’s system.

To exploit the vulnerability, in a web-based attack scenario, an attacker could host a website in an attempt to exploit the vulnerability. In addition, compromised websites and websites that accept or host user-provided content could contain 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. For example, an attacker could trick a user into clicking a link that takes the user to the attacker's site.

The update addresses the vulnerability by modifying how Microsoft Edge handles objects in memory.

CVE-2018-8291 – Scripting Engine Memory Corruption Vulnerability

Severity: Critical

Affected Software

• 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 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 11 on Windows 10 Version 1709 for 32-bit Systems
• Internet Explorer 11 on Windows 10 Version 1709 for x64-based Systems
• Internet Explorer 11 on Windows 10 Version 1803 for 32-bit Systems
• Internet Explorer 11 on Windows 10 Version 1803 for x64-based Systems
• 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
• ChakraCore

A remote code execution vulnerability exists in the way the scripting engine handles objects in memory in Microsoft browsers. 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 designed to exploit the vulnerability through a Microsoft browser 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 browser 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-2018-8296 – Scripting Engine Memory Corruption Vulnerability

Severity: Critical

Affected Software

• 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 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 11 on Windows 10 Version 1709 for 32-bit Systems
• Internet Explorer 11 on Windows 10 Version 1709 for x64-based Systems
• Internet Explorer 11 on Windows 10 Version 1803 for 32-bit Systems
• Internet Explorer 11 on Windows 10 Version 1803 for x64-based Systems

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-2018-8297 – Microsoft Edge Information Disclosure Vulnerability

Severity: Important

Affected Software

• 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

An information disclosure vulnerability exists when Microsoft Edge improperly handles objects in memory. An attacker who successfully exploited the vulnerability could obtain information to further compromise the user’s system.

To exploit the vulnerability, in a web-based attack scenario, an attacker could host a website in an attempt to exploit the vulnerability. In addition, compromised websites and websites that accept or host user-provided content could contain 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. For example, an attacker could trick a user into clicking a link that takes the user to the attacker's site.

The update addresses the vulnerability by modifying how Microsoft Edge handles objects in memory.

CVE-2018-8298 – Scripting Engine Memory Corruption Vulnerability

Severity: Important

Affected Software

• ChakraCore

A remote code execution vulnerability exists in the way that the ChakraCore scripting engine 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.

The security update addresses the vulnerability by modifying how the ChakraCore scripting engine handles objects in memory.

CVE-2018-8324 – Microsoft Edge Information Disclosure 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
• 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

An information disclosure vulnerability exists when Microsoft Edge improperly handles objects in memory. An attacker who successfully exploited the vulnerability could obtain information to further compromise the user’s system.

To exploit the vulnerability, in a web-based attack scenario, an attacker could host a website in an attempt to exploit the vulnerability. In addition, compromised websites and websites that accept or host user-provided content could contain 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. For example, an attacker could trick a user into clicking a link that takes the user to the attacker's site.

The update addresses the vulnerability by modifying how Microsoft Edge handles objects in memory.