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AUSCERT External Security Bulletin Redistribution
ESB-2015.1278
MS15-043 Cumulative Security Update for Internet Explorer (3049563)
13 May 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Internet Explorer
Publisher: Microsoft
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Increased Privileges -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Reduced Security -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2015-1718 CVE-2015-1717 CVE-2015-1714
CVE-2015-1713 CVE-2015-1712 CVE-2015-1711
CVE-2015-1710 CVE-2015-1709 CVE-2015-1708
CVE-2015-1706 CVE-2015-1705 CVE-2015-1704
CVE-2015-1703 CVE-2015-1694 CVE-2015-1692
CVE-2015-1691 CVE-2015-1689 CVE-2015-1688
CVE-2015-1686 CVE-2015-1685 CVE-2015-1684
CVE-2015-1658
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS15-043
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MS15-043 Cumulative Security Update for Internet Explorer (3049563)
Bulletin Number: MS15-043
Bulletin Title: Cumulative Security Update for Internet Explorer
Severity: Critical
KB Article: 3049563
Version: 1.0
Published Date: May 12, 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 6 (IE 6),
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 6 (IE 6),
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 6
Windows Server 2003 Service Pack 2
Windows Server 2003 x64 Edition Service Pack 2
Windows Server 2003 with SP2 for Itanium-based Systems
Internet Explorer 7
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
Internet Explorer 8
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
Internet Explorer 9
Internet Explorer 10
Windows 8 for 32-bit Systems
Windows 8 for x64-based Systems
Windows Server 2012
Windows RT
Internet Explorer 11
Windows 8.1 for 32-bit Systems
Windows 8.1 for x64-based Systems
Windows Server 2012 R2
Windows RT 8.1
Vulnerability Information
VBScript ASLR Bypass - CVE-2015-1684
A security feature bypass exists when the VBScript engine fails to use the
Address Space Layout Randomization (ASLR) security feature, allowing an
attacker to more reliably predict the memory offsets of specific instructions
in a given call stack. The security feature bypass by itself does not allow
arbitrary code execution. However, an attacker could use the ASLR bypass in
conjunction with another vulnerability, such as a remote code execution
vulnerability, that could take advantage of the ASLR bypass to more reliably
run arbitrary code on a target system.
In a web-browsing scenario, successful exploitation of an ASLR bypass requires
that a user is logged on and running an affected version of Internet Explorer,
and browses to a malicious website. Therefore, any systems where a web browser
is used frequently, such as workstations or terminal servers, are at the most
risk from ASLR bypasses. Servers could be at more risk if administrators allow
users to browse and read email on servers. However, best practices strongly
discourage allowing this.
The update addresses this ASLR bypass by helping to ensure that affected
versions of VBScript properly implement the ASLR security feature.
VBScript and JScript ASLR Bypass - CVE-2015-1686
A security feature bypass exists when the JScript and VBScript engines fail to
use the Address Space Layout Randomization (ASLR) security feature, allowing
an attacker to more reliably predict the memory offsets of specific
instructions in a given call stack. The security feature bypass by itself does
not allow arbitrary code execution. However, an attacker could use the ASLR
bypass in conjunction with another vulnerability, such as a remote code
execution vulnerability, to more reliably run arbitrary code on a target
system.
In a web-browsing scenario, successful exploitation of an ASLR bypass requires
that a user is logged on and running an affected version of Internet Explorer,
and browses to a malicious site. Therefore, any systems where a web browser is
used frequently, such as workstations or terminal servers, are at the most
risk from ASLR bypasses. Servers could be at more risk if administrators allow
users to browse and read email on servers. However, best practices strongly
discourage allowing this.
The update addresses this ASLR bypasses by helping to ensure that affected
versions of JScript and VBScript properly implement the ASLR security feature.
Internet Explorer ASLR Bypass CVE-2015-1685
A security feature bypass vulnerability exists when Internet Explorer fails to
use the Address Space Layout Randomization (ASLR) security feature, allowing
an attacker to more reliably predict the memory offsets of specific
instructions in a given call stack. An attacker who successfully exploited
this vulnerability could bypass the Address Space Layout Randomization (ASLR)
security feature, which helps protect users from a broad class of
vulnerabilities. The security feature bypass by itself does not allow
arbitrary code execution. However, an attacker could use this ASLR bypass
vulnerability in conjunction with another vulnerability, such as a remote code
execution vulnerability, to more reliably run arbitrary code on a target
system.
In a web-browsing scenario, successful exploitation of this vulnerability
requires that a user is logged on and running an affected version of Internet
Explorer, and browses to a malicious site. Therefore, any systems where a web
browser is used frequently, such as workstations or terminal servers, are at
the most risk from this vulnerability. Servers could be at more risk if
administrators allow users to browse and read email on servers. However, best
practices strongly discourage allowing this.
The update addresses the vulnerability by helping to ensure that affected
versions of Internet Explorer properly implement the ASLR security feature.
Multiple Elevation of Privilege Vulnerabilities
Elevation of privilege vulnerabilities exist when Internet Explorer does not
properly validate permissions under specific conditions, potentially allowing
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 these vulnerabilities. In addition, compromised websites
and websites that accept or host user-provided content could contain 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. For example, an attacker could trick users into clicking a
link that takes them to the attacker's site. An attacker who successfully
exploited these vulnerabilities could elevate privileges in affected versions
of Internet Explorer.
These vulnerabilities by themselves do not allow arbitrary code to be run.
However, these vulnerabilities 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
these vulnerabilities to cause the arbitrary code to run at a medium integrity
level (permissions of the current user).
The update addresses the vulnerabilities by adding additional permission
validations to Internet Explorer. The following table contains links to the
standard entry for each vulnerability in the Common Vulnerabilities and
Exposures list:
Vulnerability title CVE number
Internet Explorer Elevation of Privilege Vulnerability CVE-2015-1688
Internet Explorer Elevation of Privilege Vulnerability CVE-2015-1703
Internet Explorer Elevation of Privilege Vulnerability CVE-2015-1704
Internet Explorer Elevation of Privilege Vulnerability CVE-2015-1713
Internet Explorer Clipboard Information Disclosure Vulnerability CVE-2015-1692
An information disclosure vulnerability exists when Internet Explorer does not
properly restrict access to the clipboard of a user who visits a website. The
vulnerability could allow data stored in the Windows clipboard to be accessed
by a malicious site. An attacker could collect information from the clipboard
of a user if that user visits the malicious site and performs a clipboard
operation.
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 this vulnerability
could collect information from the clipboard if that user visits the malicious
site and performs a clipboard operation.
The update addresses the vulnerability by restricting access to the
information stored in a users clipboard.
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 complete 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
Internet Explorer Memory Corruption Vulnerability CVE-2015-1658
Internet Explorer Memory Corruption Vulnerability CVE-2015-1689
Internet Explorer Memory Corruption Vulnerability CVE-2015-1691
Internet Explorer Memory Corruption Vulnerability CVE-2015-1694
Internet Explorer Memory Corruption Vulnerability CVE-2015-1705
Internet Explorer Memory Corruption Vulnerability CVE-2015-1706
Internet Explorer Memory Corruption Vulnerability CVE-2015-1708
Internet Explorer Memory Corruption Vulnerability CVE-2015-1709
Internet Explorer Memory Corruption Vulnerability CVE-2015-1710
Internet Explorer Memory Corruption Vulnerability CVE-2015-1711
Internet Explorer Memory Corruption Vulnerability CVE-2015-1712
Internet Explorer Memory Corruption Vulnerability CVE-2015-1714
Internet Explorer Memory Corruption Vulnerability CVE-2015-1717
Internet Explorer Memory Corruption Vulnerability CVE-2015-1718
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