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             AUSCERT External Security Bulletin Redistribution

    MS15-095 - Critical - Cumulative Security Update for Microsoft Edge
                             9 September 2015


        AusCERT Security Bulletin Summary

Product:           Microsoft Edge
Publisher:         Microsoft
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2015-2542 CVE-2015-2494 CVE-2015-2486

Reference:         ESB-2015.2344

Original Bulletin: 

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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 

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 

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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