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AUSCERT External Security Bulletin Redistribution
ESB-2015.0325
MS15-012: Vulnerabilities in Microsoft Office Could Allow
Remote Code Execution
11 February 2015
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft Office
Publisher: Microsoft
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2015-0065 CVE-2015-0064 CVE-2015-0063
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS15-012
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Bulletin Number: MS15-012
Bulletin Title: Vulnerabilities in Microsoft Office Could Allow Remote Code
Execution
Severity: Important
KB Article: 3032328
Version: 1.0
Published Date: February 10, 2015
Description: This security update resolves three privately reported
vulnerabilities in Microsoft Office. 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 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.
Executive Summary
This security update resolves three privately reported vulnerabilities in
Microsoft Office. 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 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 Important for all supported editions of
Microsoft Excel 2007, Microsoft Word 2007, Microsoft Office 2010, Microsoft
Excel 2010, Microsoft Word 2010, Microsoft Web Applications 2010, Microsoft
Excel 2013, Microsoft Word Viewer, Microsoft Excel Viewer, and Microsoft
Office Compatibility Pack. For more information, see the Affected Software
section.
Affected Software
Microsoft Office 2007 Service Pack 3
Microsoft Office 2010 Service Pack 2 (32-bit editions) (proofing tools)
Microsoft Office 2010 Service Pack 2 (64-bit editions) (proofing tools)
Microsoft Office 2010 Service Pack 2 (32-bit editions)
Microsoft Office 2010 Service Pack 2 (64-bit editions)
Microsoft Office 2013 (32-bit editions)
Microsoft Office 2013 (64-bit editions)
Microsoft Office 2013 Service Pack 1 (32-bit editions)
Microsoft Office 2013 Service Pack 1 (64-bit editions)
Microsoft Office 2013 RT
Microsoft Office 2013 RT Service Pack 1
Microsoft Word Viewer
Microsoft Excel Viewer
Microsoft Office Compatibility Pack Service Pack 3
Microsoft SharePoint Server 2010 Service Pack 2
Microsoft Office Web Apps 2010 Service Pack 2
Vulnerability Information
Excel Remote Code Execution Vulnerability - CVE-2015-0063
A remote code execution vulnerability exists in Microsoft Excel that is caused
when Excel 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 this vulnerability 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 this vulnerability requires that a user open a specially
crafted file with an affected version of Microsoft Excel. 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
the 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 email message or Instant Messenger message, and then
convince them to open the specially crafted file.
The security update addresses the vulnerability by correcting how Microsoft
Excel parses files. Systems where affected Microsoft Office software is used,
including workstations and terminal servers, are primarily at risk. Servers
could be at more risk if administrators allow users to log on to servers and
to run programs. However, best practices strongly discourage allowing this.
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.
Office Remote Code Execution Vulnerability - CVE-2015-0064
A remote code execution vulnerability exists in Microsoft Word that is caused
when Word 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 this vulnerability 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 this vulnerability requires that a user open a specially
crafted file with an affected version of Microsoft Word. 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. Note that
the Preview Pane is not an attack vector for this vulnerability. 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 email message or Instant Messenger message, and then
convince them to open the specially crafted file.
The security update addresses the vulnerability by correcting how Microsoft
Word parses files. Systems where affected Microsoft Office software is used,
including workstations and terminal servers, are primarily at risk. Servers
could be at more risk if administrators allow users to log on to servers and
to run programs. However, best practices strongly discourage allowing this.
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.
OneTableDocumentStream Remote Code Execution Vulnerability - CVE-2015-0065
A remote code execution vulnerability exists in Microsoft Word that is caused
when Word 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 this vulnerability 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 this vulnerability requires that a user open a specially
crafted file with an affected version of Microsoft Word. 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 email message or Instant Messenger message, and then
convince them to open the specially crafted file.
The security update addresses the vulnerability by correcting how Microsoft
Word parses files. Systems where affected Microsoft Office software is used,
including workstations and terminal servers, are primarily at risk. Servers
could be at more risk if administrators allow users to log on to servers and
to run programs. However, best practices strongly discourage allowing this.
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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