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AUSCERT External Security Bulletin Redistribution
ESB-2015.3059
MS15-124 Cumulative Security Update for Internet Explorer (3116180)
9 December 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
Cross-site Scripting -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Reduced Security -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2015-6164 CVE-2015-6162 CVE-2015-6161
CVE-2015-6160 CVE-2015-6159 CVE-2015-6158
CVE-2015-6157 CVE-2015-6156 CVE-2015-6155
CVE-2015-6154 CVE-2015-6153 CVE-2015-6152
CVE-2015-6151 CVE-2015-6150 CVE-2015-6149
CVE-2015-6148 CVE-2015-6147 CVE-2015-6146
CVE-2015-6145 CVE-2015-6143 CVE-2015-6142
CVE-2015-6141 CVE-2015-6140 CVE-2015-6139
CVE-2015-6138 CVE-2015-6136 CVE-2015-6135
CVE-2015-6134 CVE-2015-6083 CVE-2015-614
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS15-124
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MS15-124 Cumulative Security Update for Internet Explorer (3116180)
Document Metadata
Bulletin Number: MS15-124
Bulletin Title: Cumulative Security Update for Internet Explorer
Severity: Critical
KB Article: 3116180
Version: 1.0
Published Date: December 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 the 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 [1][2]
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 [3]
Windows 10 for x64-based Systems [3]
Windows 10 Version 1511 for 32-bit Systems [3]
Windows 10 Version 1511 for x64-based Systems [3]
[1] For information about changes in support for Internet Explorer beginning
January 12, 2016, see Microsoft Support Lifecycle.
[2] This update is available via Windows Update.
[3] Windows 10 updates are cumulative. In addition to containing non-security
updates, they also contain all of the security fixes for all of the Windows
10-affected vulnerabilities shipping with the monthly security release. The
updates are available via the Microsoft Update Catalog.
Vulnerability Information
Multiple Internet Explorer Memory Corruption Vulnerabilities
Multiple 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 the
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 way of enticement in an email
or Instant Messenger message, 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.
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
Internet Explorer Memory Corruption Vulnerability CVE-2015-6083 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6134 No No
Microsoft Browser Memory Corruption Vulnerability CVE-2015-6140 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6141 No No
Microsoft Browser Memory Corruption Vulnerability CVE-2015-6142 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6143 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6145 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6146 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6147 No No
Microsoft Browser Memory Corruption Vulnerability CVE-2015-6148 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6149 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6150 No No
Microsoft Browser Memory Corruption Vulnerability CVE-2015-6151 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6152 No No
Microsoft Browser Memory Corruption Vulnerability CVE-2015-6153 No No
Microsoft Browser Memory Corruption Vulnerability CVE-2015-6154 No No
Microsoft Browser Memory Corruption Vulnerability CVE-2015-6155 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6156 No No
Microsoft Browser Memory Corruption Vulnerability CVE-2015-6158 No No
Microsoft Browser Memory Corruption Vulnerability CVE-2015-6159 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6160 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6162 No No
Multiple Microsoft Browser XSS Filter Bypass Vulnerabilities
Multiple XSS filter bypass vulnerabilities exist in the way that Internet
Explorer disables an HTML attribute in otherwise appropriately filtered HTTP
response data. The vulnerabilities could allow initially disabled scripts to
run in the wrong security context, leading to information disclosure.
An attacker could post on a website specially crafted content that is designed
to exploit the vulnerabilities. The attacker would then have to convince the
user to view the content on the affected website. If the user then browses to
the website, the XSS filter disables HTML attributes in the specially crafted
content, creating a condition that could allow malicious script to run in the
wrong security context, leading to information disclosure.
An attacker who successfully exploited the vulnerabilities could cause script
to run on another user's system in the guise of a third-party website. Such
script would run inside the browser when visiting the third-party website, and
could take any action on the user's system that the third-party website was
permitted to take. The vulnerabilities could only be exploited if the user
clicked a hypertext link, either in an HTML email or if the user visited an
attacker's website or a website containing content that is under the attackers
control.
The update addresses the vulnerabilities by preventing the XSS filter in
Internet Explorer from incorrectly disabling HTML attributes.
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
Internet Explorer XSS Filter Bypass Vulnerability CVE-2015-6138 No No
Microsoft Browser XSS Filter Bypass Vulnerability CVE-2015-614 No No
Scripting Engine Information Disclosure Vulnerability - CVE-2015-6135
An information disclosure vulnerability exists when VBScript improperly
discloses the contents of its memory, which could provide an attacker with
information to further compromise the users computer or data.
To exploit the vulnerability, an attacker must know the memory address of
where the object was created. The update addresses the vulnerability by
changing the way certain functions handle objects in memory.
Microsoft received information about this vulnerability through coordinated
vulnerability disclosure. At the time this security bulletin was originally
issued, Microsoft was unaware of any attack attempting to exploit this
vulnerability.
Scripting Engine Memory Corruption Vulnerability CVE-2015-6136
A multiple remote code execution vulnerability exists in the way that the
VBScript engine renders when handling objects in memory in Internet Explorer.
The vulnerability could corrupt memory in such a way that an attacker could
execute arbitrary code in the context of the current user.
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 scripting
engine handles objects in memory.
Microsoft received information about this vulnerability through coordinated
vulnerability disclosure. At the time this security bulletin was originally
issued, Microsoft was unaware of any attack attempting to exploit this
vulnerability.
Internet Explorer Elevation of Privilege Vulnerability CVE-2015-6139
An elevation of privilege vulnerability exists when Internet Explorer does not
properly enforce content types. An attacker who successfully exploited the
vulnerability could run arbitrary script 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 this vulnerability
could elevate privileges in affected versions of Internet Explorer.
The update addresses the vulnerability by helping to ensure that Internet
Explorer properly enforces content types. Microsoft received information about
this vulnerability through coordinated vulnerability disclosure. At the time
this security bulletin was originally issued, Microsoft was unaware of any
attack attempting to exploit this vulnerability.
Internet Explorer Information Disclosure Vulnerability - CVE-2015-6157
An information disclosure vulnerability exists when Internet Explorer
improperly discloses the contents of its memory. An attacker who successfully
exploited this vulnerability could provide the attacker with information to
further compromise the users system.
In a web-based attack scenario, an attacker could host a website in an attempt
to exploit this vulnerability. Additionally, 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.
The update addresses the vulnerability by changing the way certain functions
handle objects in memory. Microsoft received information about the
vulnerability through coordinated vulnerability disclosure. At the time this
security bulletin was originally issued, Microsoft was unaware of any attack
attempting to exploit this vulnerability.
Microsoft Browser ASLR Bypass CVE-2015-6161
A security feature bypass 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 it 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 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 the ASLR bypass
requires a user to be logged on and running an affected version of Internet
Explorer. The user would then need to browse to a malicious site.
Microsoft received information about this bypass through coordinated
disclosure. At the time this security bulletin was originally issued,
Microsoft was unaware of any attack attempting to exploit this vulnerability.
Internet Explorer XSS Filter Bypass Vulnerability CVE-2015-6164
A security feature bypass vulnerability exists when Internet Explorer does not
properly enforce cross-domain policies. The vulnerability could allow an
attacker to access information from one domain and inject it into another
domain.
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 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 (for
example, 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 this
vulnerability to cause the arbitrary code to run at a medium integrity level
(permissions of the current user).
The update addresses the vulnerability by helping to ensure that cross-domain
policies are properly enforced in Internet Explorer. This vulnerability has
been disclosed. It has been assigned Common Vulnerability and Exposure number
CVE-2015-6164. At the time this security bulletin was originally issued,
Microsoft was unaware of any attack attempting to exploit this vulnerability.
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