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AUSCERT External Security Bulletin Redistribution
ESB-2015.2344
MS15-094 - Critical - Cumulative Security Update for Internet Explorer
9 September 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft Internet Explorer
Publisher: Microsoft
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Increased Privileges -- Remote with User Interaction
Delete Arbitrary Files -- Existing Account
Access Confidential Data -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2015-2542 CVE-2015-2541 CVE-2015-2501
CVE-2015-2500 CVE-2015-2499 CVE-2015-2498
CVE-2015-2494 CVE-2015-2493 CVE-2015-2492
CVE-2015-2491 CVE-2015-2490 CVE-2015-2489
CVE-2015-2487 CVE-2015-2486 CVE-2015-2485
CVE-2015-2484 CVE-2015-2483
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS15-094
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MS15-094 - Cumulative Security Update for Internet Explorer (3089548)
Bulletin Number: MS15-094
Bulletin Title: Cumulative Security Update for Internet Explorer
Severity: Critical
KB Article: 3089548
Version: 1.0
Published Date: September 8, 2015
Executive Summary
This security update resolves vulnerabilities in Internet Explorer. The most
severe of the vulnerabilities could allow remote code execution if a user
views a specially crafted webpage using Internet Explorer. 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 Internet Explorer 7 (IE 7),
Internet Explorer 8 (IE 8), Internet Explorer 9 (IE 9), Internet Explorer 10
(IE 10), and Internet Explorer 11 (IE 11) on affected Windows clients, and
Moderate for Internet Explorer 7 (IE 7), Internet Explorer 8 (IE 8), Internet
Explorer 9 (IE 9), Internet Explorer 10 (IE 10), and Internet Explorer 11 (IE
11) on affected Windows servers. For more information, see the Affected
Software section.
Affected Software
Internet Explorer 7
Internet Explorer 8
Internet Explorer 9
Internet Explorer 10
Internet Explorer 11
Windows Vista Service Pack 2
Windows Vista x64 Edition Service Pack 2
Windows Server 2008 for 32-bit Systems Service Pack 2
Windows Server 2008 for x64-based Systems Service Pack 2
Windows Server 2008 for Itanium-based Systems Service Pack 2
Windows 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
Windows 8 for 32-bit Systems
Windows 8 for x64-based Systems
Windows Server 2012
Windows RT
Windows 8.1 for 32-bit Systems
Windows 8.1 for x64-based Systems
Windows Server 2012 R2
Windows RT 8.1
Windows 10 for 32-bit Systems[2]
Windows 10 for x64-based Systems[2]
[1]This update is available via Windows Update.
[2]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 3081444 for more information and download
links.
Vulnerability Information
Multiple Memory Corruption Vulnerabilities in Internet Explorer
Remote code execution vulnerabilities exist when Internet Explorer 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 Internet Explorer, 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 Internet Explorer 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 Internet Explorer
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-2015-2487 No No
Memory Corruption Vulnerability CVE-2015-2490 No No
Memory Corruption Vulnerability CVE-2015-2491 No No
Memory Corruption Vulnerability CVE-2015-2492 No No
Memory Corruption Vulnerability CVE-2015-2494 No No
Memory Corruption Vulnerability CVE-2015-2498 No No
Memory Corruption Vulnerability CVE-2015-2499 No No
Memory Corruption Vulnerability CVE-2015-2500 No No
Memory Corruption Vulnerability CVE-2015-2501 No No
Memory Corruption Vulnerability CVE-2015-2541 No No
Memory Corruption Vulnerability CVE-2015-2542 Yes No
Scripting Engine Memory Corruption Vulnerability - CVE-2015-2493
A remote code execution vulnerability exists in the way that the VBScript and
JScript engines, when rendered in Internet Explorer, handle objects in memory.
In a web-based attack scenario, an attacker could host a specially crafted
website that is designed to exploit the vulnerability through Internet
Explorer 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 IE 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.
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. The update addresses the vulnerability by modifying how the
VBScript and JScript scripting engines handle objects in memory.
Microsoft received information about this vulnerability through coordinated
vulnerability disclosure. When this security bulletin was originally issued,
Microsoft had not received any information to indicate that the vulnerability
had been publicly used to attack customers.
Elevation of Privilege Vulnerability - CVE-2015-2489
An elevation of privilege vulnerability exists when Internet Explorer does not
properly validate permissions under specific conditions, potentially allowing
a script to be run with elevated privileges.
In a web-based attack scenario, an attacker could host a website that is used
to attempt to exploit this vulnerability. In addition, compromised websites
and websites that accept or host user-provided content could contain specially
crafted content that could exploit this 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. An attacker who successfully exploited the vulnerability
could elevate privileges in affected versions of Internet Explorer.
The vulnerability by itself does not allow arbitrary code to be run. However,
the vulnerability could be used in conjunction with another vulnerability
(e.g., a remote code execution vulnerability) that could take advantage of the
elevated privileges when running arbitrary code. For example, an attacker
could exploit another vulnerability to run arbitrary code through Internet
Explorer, but due to the context in which processes are launched by Internet
Explorer, the code might be restricted to run at a low integrity level (very
limited permissions). However, an attacker could, in turn, exploit the
vulnerability to cause the arbitrary code to run at a medium integrity level
(permissions of the current user).
Information Disclosure Vulnerability - CVE-2015-2483
An information disclosure vulnerability exists when Internet Explorer
improperly discloses the contents of its memory, which could provide an
attacker with information to further compromise the users computer. The update
addresses the vulnerability by changing the way certain functions handle
objects in memory.
Tampering Vulnerability - CVE-2015-2484
A tampering vulnerability exists when Internet Explorer accesses a file with
an improper flag that in turn permits a file operation. This could allow a low
privilege process to delete arbitrary files on the local system. This update
addresses the vulnerability by properly masking this flag off.
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The University of Queensland
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