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AUSCERT External Security Bulletin Redistribution
ESB-2016.1919
MS16-096 - Cumulative Security Update for Microsoft Edge (3177358)
9 August 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft Edge
Publisher: Microsoft
Operating System: Windows 10
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2016-3329 CVE-2016-3327 CVE-2016-3326
CVE-2016-3322 CVE-2016-3319 CVE-2016-3296
CVE-2016-3293 CVE-2016-3289
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS16-096
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MS16-096 - Cumulative Security Update for Microsoft Edge (3177358)
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
Windows 10 [1]
[1] Windows 10 updates are cumulative. The monthly security release includes
all security fixes for vulnerabilities that affect Windows 10, in addition to
non-security updates. The updates are available via the Microsoft Update
Catalog.
Multiple Edge Memory Corruption Vulnerabilities
Multiple remote code execution vulnerabilities exist when Microsoft Edge
improperly accesses objects in memory. The vulnerabilities could corrupt
memory in a way that enables an attacker to execute arbitrary code in the
context of the current user. 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 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 vulnerabilities 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 vulnerabilities. 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 an enticement in an email or instant
message, or by getting them to open an email attachment. The update addresses
the vulnerabilities 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-2016-3289 No No
Microsoft Browser Memory Corruption Vulnerability CVE-2016-3293 No No
Microsoft PDF Remote Code Execution Vulnerability CVE-2016-3319 No No
Microsoft Browser Memory Corruption Vulnerability CVE-2016-3322 No No
Scripting Engine Memory Corruption Vulnerability - CVE-2016-3296
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. 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. 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. The update
addresses the vulnerability by modifying how the Chakra JavaScript scripting
engine handles objects in memory.
The following table contains links to the standard entry for the vulnerability
in the Common Vulnerabilities and Exposures list:
Vulnerability title CVE number Publicly disclosed Exploited
Scripting Engine Memory Corruption Vulnerability CVE-2016-3296 No No
Multiple Microsoft Edge Information Disclosure Vulnerabilities
Multiple information disclosure vulnerabilities exist when Microsoft Edge
improperly handles objects in memory. An attacker who successfully exploited
the vulnerabilities could obtain information to further compromise the users
system.
To exploit the vulnerabilities, in a web-based attack scenario, an attacker
could host a website that is used to attempt to exploit the vulnerabilities.
In addition, compromised websites and websites that accept or host
user-provided content could contain specially crafted content that could
exploit the vulnerabilities. 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. For example, an attacker
could trick users into clicking a link that takes them to the attacker's site.
The update addresses the vulnerabilities by changing how certain functions
handle 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 Information Disclosure Vulnerability CVE-2016-3326 No No
Microsoft Browser Information Disclosure Vulnerability CVE-2016-3327 No No
Microsoft Edge Information Disclosure Vulnerability - CVE-2016-3329
An information disclosure vulnerability exists when Microsoft Edge improperly
handles page content, which could allow an attacker to detect the existence of
specific files on the user's system. The update addresses the vulnerability by
helping to ensure that page content is properly validated in Microsoft Edge.
To exploit the vulnerability, in a web-based attack scenario, an attacker
could host a website that is used to 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. 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. For example, an attacker could trick users
into clicking a link that takes them to the attacker's site. The update
addresses the vulnerability by changing how certain functions handle 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 Information Disclosure Vulnerability CVE-2016-3329 No No
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