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AUSCERT External Security Bulletin Redistribution
ESB-2016.1131
This security update resolves vulnerabilities in Microsoft Edge.
11 May 2016
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AusCERT Security Bulletin Summary
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Product: Microsoft Edge
Publisher: Microsoft
Operating System: Windows 10
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2016-0193 CVE-2016-0192 CVE-2016-0191
CVE-2016-0186
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS16-052
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MS16-052 - Cumulative Security Update for Microsoft Edge (3155538)
Document Metadata
Bulletin Number: MS16-052
Bulletin Title: Cumulative Security Update for Microsoft Edge
Severity: Critical
KB Article: 3155538
Version: 1.0
Published Date: May 10, 2016
Executive Summary
This security update resolves vulnerabilities in Microsoft Edge. The most
severe of the vulnerabilities could allow remote code execution if a user views
a specially crafted webpage using Microsoft Edge. An attacker who successfully
exploited the vulnerabilities could gain the same user rights as the current
user. Customers whose accounts are configured to have fewer user rights on
the system could be less impacted than users with administrative user rights.
This security update is rated Critical for Microsoft Edge on Windows 10.
Affected Software
Microsoft Edge
Vulnerability Information
Multiple Scripting Engine Memory Corruption Vulnerabilities
Multiple remote code execution vulnerabilities exist in the way that the
Chakra JavaScript engine renders when handling objects in memory in Microsoft
Edge. The vulnerabilities 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 vulnerabilities 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 vulnerabilities.
An attacker who successfully exploited the vulnerabilities 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
vulnerabilities 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 vulnerabilities by modifying how the Chakra JavaScript
scripting engine handles objects in memory.
Vulnerability title CVE number Publicly disclosed Exploited
Scripting Engine Memory Corruption Vulnerability CVE-2016-0186 No No
Scripting Engine Memory Corruption Vulnerability CVE-2016-0191 No No
Scripting Engine Memory Corruption Vulnerability CVE-2016-0193 No No
Microsoft Browser Memory Corruption Vulnerability
A remote code execution vulnerability exists when Microsoft Edge improperly
accesses objects in memory. The vulnerability could corrupt memory that enables
an attacker to execute arbitrary code in the context of the current user.
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.
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. The update addresses
the vulnerability by modifying how Microsoft Edge handles objects in memory.
The following table contains links to the standard entry for each vulnerability
in the Common Vulnerabilities and Exposures list:
Vulnerability title CVE number Publicly disclosed Exploited
Microsoft Browser Memory Corruption Vulnerability CVE-2016-0192 No No
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