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AUSCERT External Security Bulletin Redistribution
ESB-2015.1487
MS15-056: Cumulative Security Update for Internet Explorer (3058515)
9 June 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
Resolution: Patch/Upgrade
CVE Names: CVE-2015-1766 CVE-2015-1765 CVE-2015-1755
CVE-2015-1754 CVE-2015-1753 CVE-2015-1752
CVE-2015-1751 CVE-2015-1750 CVE-2015-1748
CVE-2015-1747 CVE-2015-1745 CVE-2015-1744
CVE-2015-1743 CVE-2015-1742 CVE-2015-1741
CVE-2015-1740 CVE-2015-1739 CVE-2015-1737
CVE-2015-1736 CVE-2015-1735 CVE-2015-1732
CVE-2015-1731 CVE-2015-1730 CVE-2015-1687
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS15-056
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Bulletin Number: MS15-056
Bulletin Title: Cumulative Security Update for Internet Explorer
Severity: Critical
KB Article: 3058515
Version: 1.0
Published Date: June 9, 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.
Affected Software
Internet Explorer 6
Internet Explorer 7
Internet Explorer 8
Internet Explorer 9
Internet Explorer 10
Internet Explorer 11
Vulnerability Information
Internet Explorer Information Disclosure Vulnerability - CVE-2015-1765
An information disclosure vulnerability exists in Internet Explorer that could
allow an attacker who successfully exploited this vulnerability to gain access
to a user's browser history.
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.
Vulnerability title CVE number Publicly Disclosed Exploited
Internet Explorer Information CVE-2015-1765 Yes No
Disclosure Vulnerability
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 Publicly Disclosed Exploited
Internet Explorer Elevation of CVE-2015-1739 No No
Privilege Vulnerability
Internet Explorer Elevation of CVE-2015-1743 No No
Privilege Vulnerability
Internet Explorer Elevation of CVE-2015-1748 No No
Privilege Vulnerability
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 Publicly Disclosed Exploited
Internet Explorer Memory Corruption Vulnerability CVE-2015-1687 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-1730 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-1731 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-1732 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-1735 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-1736 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-1737 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-1740 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-1741 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-1742 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-1744 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-1745 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-1747 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-1750 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-1751 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-1752 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-1753 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-1754 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-1755 No No
Internet Explorer Memory Corruption Vulnerability CVE-2015-1766 No No
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