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AUSCERT External Security Bulletin Redistribution
ESB-2015.0974
Microsoft Security Bulletin MS15-033 - Critical
15 April 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft Office
Publisher: Microsoft
Operating System: Windows
OS X
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Cross-site Scripting -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2015-1651 CVE-2015-1650 CVE-2015-1649
CVE-2015-1641 CVE-2015-1639
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS15-033
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Microsoft Security Bulletin MS15-033 - Critical
Vulnerabilities in Microsoft Office Could Allow Remote Code Execution (3048019)
Published: April 14, 2015
Version: 1.0
Executive Summary
This security update resolves vulnerabilities in Microsoft Office. The most
severe of the vulnerabilities could allow remote code execution if a user
opens a specially crafted Microsoft Office file. An attacker who successfully
exploited the vulnerabilities could run arbitrary code in the context of 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 all supported editions of the
following software:
Microsoft Word 2007, Microsoft Office 2010, Microsoft Word 2010
Microsoft Word Viewer, Microsoft Office Compatibility Pack
Word Automation Services on Microsoft SharePoint Server 2010
Microsoft Office Web Apps Server 2010
This security update is rated Important for all supported editions of the
following software:
Microsoft Word 2013
Microsoft Office for Mac 2011, Microsoft Word for Mac 2011, Outlook for
Mac for Office 365
Word Automation Services on Microsoft SharePoint Server 2013
Microsoft Office Web Apps Server 2013
For more information, see the Affected Software section.
Affected Software
Microsoft Office Software
Microsoft Office 2007
Microsoft Office 2007 Service Pack 3
Microsoft Office 2010
Microsoft Office 2010 Service Pack 2 (32-bit editions)
Microsoft Office 2010 Service Pack 2 (64-bit editions)
Microsoft Office 2013 and Microsoft Office 2013 RT
Microsoft Office 2013 Service Pack 1 (32-bit editions)
Microsoft Office 2013 Service Pack 1 (64-bit editions)
Microsoft Office 2013 RT Service Pack 1
Microsoft Office for Mac
Microsoft Outlook for Mac for Office 365
Microsoft Office for Mac 2011
Other Office Software
Microsoft Word Viewer
Microsoft Office Compatibility Pack Service Pack 3
Microsoft Office Services and Web Apps
Microsoft SharePoint Server 2010
Microsoft SharePoint Server 2010 Service Pack 2
Microsoft SharePoint Server 2013
Microsoft SharePoint Server 2013 Service Pack 1
Microsoft Office Web Apps 2010
Microsoft Office Web Apps 2010 Service Pack 2
Microsoft Office Web Apps 2013
Microsoft Office Web Apps 2013 Service Pack 1
Vulnerability Information
Microsoft Office Memory Corruption Vulnerability - CVE-2015-1641
A remote code execution vulnerability exists in Microsoft Office software when
the Office software fails to properly handle rich text format files in memory.
An attacker who successfully exploited the vulnerability could use a specially
crafted file to perform actions in the security context of the current user. The
file could then, for example, take actions on behalf of the logged-on user with
the same permissions as the current user.
Exploitation of this vulnerability requires that a user open a specially crafted
file with an affected version of Microsoft Office software. In an email attack
scenario an attacker could exploit the vulnerability by sending the specially
crafted file to the user and convincing the user to open the file. In a web-based
attack scenario an attacker could host a website (or leverage a compromised
website that accepts or hosts user-provided content) that contains a specially
crafted file that is designed to exploit the vulnerability. An attacker would
have no way to force users to visit the website. Instead, an attacker would have
to convince users to visit it, typically by getting them to click a link in an
instant messenger or email message, and then convince them to open the specially
crafted file.
The security update addresses the vulnerability by correcting how Office handles
files in memory.
This vulnerability has been publicly disclosed. It has been assigned Common
Vulnerability and Exposure number CVE-2015-1641. Microsoft is aware of limited
attacks that attempt to exploit this vulnerability.
Multiple Microsoft Office Component Use After Free Vulnerabilities
Remote code execution vulnerabilities exist in Microsoft Office software that are
caused when the Office software improperly handles objects in memory while parsing
specially crafted Office files. This could corrupt system memory in such a way as
to allow an attacker to execute arbitrary code.
An attacker who successfully exploited these vulnerabilities could run arbitrary
code in the context of the current user. If the current user is logged on with
administrative user rights, an attacker could take complete control of the
affected system. An attacker could then install programs; view, change, or delete
data; or create new accounts with full user rights. Users whose accounts are
configured to have fewer user rights on the system could be less impacted than
users who operate with administrative user rights.
Exploitation of these vulnerabilities requires that a user open a specially
crafted file with an affected version of Microsoft Office software. In an email
attack scenario an attacker could exploit the vulnerabilities by sending a
specially crafted file to the user and convincing the user to open the file. In
a web-based attack scenario an attacker could host a website (or leverage a
compromised website that accepts or hosts user-provided content) that contains a
specially crafted file that is designed to exploit the vulnerabilities. An
attacker would have no way to force users to visit the website. Instead, an
attacker would have to convince users to visit it, typically by getting them to
click a link in an instant messenger or email message, and then convince them to
open the specially crafted file.
The security update addresses the vulnerabilities by correcting how Microsoft
Office parses specially crafted files.
Microsoft received information about the vulnerability through coordinated
vulnerability disclosure. When this security bulletin was issued, Microsoft had
not received any information to indicate that this vulnerability had been
publicly used to attack customers.
The following tables contain links to the standard entry for each vulnerability
in the Common Vulnerabilities and Exposures list:
Vulnerability title CVE number
Microsoft Office Component Use After Free Vulnerability CVE-2015-1650
Note that the Preview Pane is an attack vector for the following vulnerabilities:
Vulnerability title CVE number
Microsoft Office Component Use After Free Vulnerability CVE-2015-1649
Microsoft Office Component Use After Free Vulnerability CVE-2015-1651
Microsoft Outlook App for Mac XSS Vulnerability – CVE-2015-1639
An elevation of privilege vulnerability exists in the Microsoft Outlook for Mac
app that is caused when the software improperly sanitizes HTML strings.
An attacker who successfully exploited this vulnerability could read content
that the attacker is not authorized to read or use the victim's identity to
take actions on the targeted site or application.
Exploitation of this vulnerability requires that a user views specially
crafted content, which then could run a script in the context of the user. In
a web-based attack scenario an attacker could host a website (or leverage a
compromised website that accepts or hosts user-provided content) that contains
specially crafted content that is designed to exploit the vulnerability. An
attacker would have no way to force users to visit the website. Instead, an
attacker would have to convince users to visit it, typically by getting them
to click a link in an instant messenger or email message, and then convince
them to open the specially crafted file.
Systems where users leverage the Outlook app on iOS devices are primarily at
risk from this vulnerability. The security update addresses the vulnerability
by correcting how Microsoft Outlook for Mac sanitizes HTML strings.
Microsoft received information about the vulnerability through coordinated
vulnerability disclosure. When this security bulletin was issued, Microsoft
had not received any information to indicate that this vulnerability had been
publicly used to attack customers.
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