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                               CERT-Renater

                   Note d'Information No. 2016/VULN192
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DATE                : 11/05/2016

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Microsoft Edge.

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KB3155538
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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