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AUSCERT External Security Bulletin Redistribution
ESB-2015.2345
MS15-095 - Critical - Cumulative Security Update for Microsoft Edge
9 September 2015
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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
CVE-2015-2485
Reference: ESB-2015.2344
Original Bulletin:
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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