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                            CERT-Renater

                Note d'Information No. 2015/VULN172
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DATE                : 09/09/2015

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Windows version 10 running Microsoft Edge.

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KB3089665
https://technet.microsoft.com/en-us/library/security/MS15-095
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MS15-095 - Cumulative Security Update for Microsoft Edge (3089665)

Bulletin Number: MS15-095

Bulletin Title: Cumulative Security Update for Microsoft Edge

Severity: Critical

KB Article: 3089665

Version: 1.0

Published Date: September 8, 2015


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 these 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 those who operate with administrative user rights.

This security update is rated Critical for Microsoft Edge on affected
Windows clients. For more information, see the Affected Software
section.


Affected Software

Microsoft Edge

Windows 10 for 32-bit Systems[1]

Windows 10 for x64-based Systems[1]

[1]The Windows 10 update is cumulative. In addition to containing
non-security updates, it also contains all of the security fixes for
all of the Windows 10-affected vulnerabilities shipping with this
months security release. See Microsoft Knowledge Base Article 3081445
for more information and download links.


Vulnerability Information

Multiple Memory Corruption Vulnerabilities

Remote code execution vulnerabilities exist when Microsoft Edge
improperly accesses objects in memory. These vulnerabilities could
corrupt memory in such a way that an attacker could execute arbitrary
code in the context of the current user.

An attacker could host a specially crafted website that is designed to
exploit these 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 these 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 getting them to click a link in an instant
messenger or email message that takes users to the attacker's website,
or by getting them to open an attachment sent through email.

An attacker who successfully exploited these 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 these 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. Systems
where Microsoft Edge is used frequently, such as workstations or
terminal servers, are at the most risk from these vulnerabilities.

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

Memory Corruption Vulnerability CVE-2015-2485	No 		No

Memory Corruption Vulnerability CVE-2015-2486	No 		No

Memory Corruption Vulnerability CVE-2015-2494	No 		No

Memory Corruption Vulnerability CVE-2015-2542	Yes 		No


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