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AUSCERT External Security Bulletin Redistribution
ESB-2015.2793
MS15-112 Cumulative Security Update for Internet Explorer (3104517)
11 November 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
Access Confidential Data -- Remote with User Interaction
Reduced Security -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2015-6089 CVE-2015-6088 CVE-2015-6087
CVE-2015-6086 CVE-2015-6085 CVE-2015-6084
CVE-2015-6082 CVE-2015-6081 CVE-2015-6080
CVE-2015-6079 CVE-2015-6078 CVE-2015-6077
CVE-2015-6076 CVE-2015-6075 CVE-2015-6074
CVE-2015-6073 CVE-2015-6072 CVE-2015-6071
CVE-2015-6070 CVE-2015-6069 CVE-2015-6068
CVE-2015-6066 CVE-2015-6065 CVE-2015-6064
CVE-2015-2427
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS15-112
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MS15-112 Cumulative Security Update for Internet Explorer (3104517)
Document Metadata
Bulletin Number: MS15-112
Bulletin Title: Cumulative Security Update for Internet Explorer
Severity: Critical
KB Article: 3104517
Version: 1.0
Published Date: November 10, 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]
Windows 10 Version 1511 for 32-bit Systems[2]
Windows 10 Version 1511 for x64-based Systems[2]
[1]This update is available via Windows Update.
[2]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
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
Internet Explorer Memory Corruption Vulnerability CVE-2015-2427 No No
Microsoft Browser Memory Corruption Vulnerability CVE-2015-6064 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6065 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6066 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6068 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6069 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6070 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6071 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6072 No No
Microsoft Browser Memory Corruption Vulnerability CVE-2015-6073 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6074 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6075 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6076 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6077 No No
Microsoft Browser Memory Corruption Vulnerability CVE-2015-6078 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6079 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6080 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6081 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6082 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6084 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6085 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-6087 No No
Scripting Engine Memory Corruption Vulnerability - CVE-2015-6089
A remote code execution vulnerability exists in the way that the JScript and
VBScript engines, when handling objects in memory in Internet Explorer,
render. 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 JScript and
VBScript scripting engines 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.
Internet Explorer Information Disclosure Vulnerability - CVE-2015-6086
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. 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.
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-2015-6088
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 that a user is logged on and running an affected version of Internet
Explorer, and then 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 ASLR bypass. 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 ASLR bypass by helping to ensure that affected
versions of Internet Explorer properly implement the ASLR security feature.
Microsoft received information about this bypass through coordinated bypass
disclosure. At the time this security bulletin was originally issued,
Microsoft was unaware of any attack attempting to exploit this vulnerability.
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