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Vulnerabilities in Microsoft Office Could Allow Remote Code Execution
(MS06-038)
------------------------------------------------------------------------
SUMMARY
When using vulnerable versions of Office, if a user were logged on with
administrative user rights, an attacker who successfully exploited this
vulnerability could take complete control of the client workstation. 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.
DETAILS
Vulnerable Systems:
* Microsoft Office 2003 Service Pack 1 or Service Pack 2 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=1B11AC6B-4A78-4A7B-995F-94738CAFE27F>
Download the update (KB917151)
* Microsoft Access 2003
* Microsoft Excel 2003
* Microsoft Excel 2003 Viewer
* Microsoft FrontPage 2003
* Microsoft InfoPath 2003
* Microsoft OneNote 2003
* Microsoft Outlook 2003
* Microsoft PowerPoint 2003
* Microsoft Project 2003
* Microsoft Publisher 2003
* Microsoft Visio 2003
* Microsoft Word 2003
* Microsoft Word 2003 Viewer
* Microsoft Office XP Service Pack 3 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=266C287E-A773-4D9C-9736-EEAFB34FF893>
Download the update (KB917150)
* Microsoft Access 2002
* Microsoft Excel 2002
* Microsoft FrontPage 2002
* Microsoft Outlook 2002
* Microsoft PowerPoint 2002
* Microsoft Publisher 2002
* Microsoft Visio 2002
* Microsoft Word 2002
* Microsoft Office 2000 Service Pack 3 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=776FF379-0B9D-45D5-8B3C-CF9A4BD25DAE>
Download the update (KB917152)
* Microsoft Access 2000
* Microsoft Excel 2000
* Microsoft FrontPage 2000
* Microsoft Outlook 2000
* Microsoft PowerPoint 2000
* Microsoft Publisher 2000
* Microsoft Word 2000
* Microsoft Project 2002 Service Pack 1 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=BF9CBFA6-5E91-4AA8-82C1-4C9A92A5B954>
Download the update (KB917150)
* Microsoft Visio 2002 Service Pack 2 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=9F67D75A-B69D-4064-942C-F5515C920E6B>
Download the update (KB917150)
* Microsoft Project 2000 Service Release 1
<http://www.microsoft.com/downloads/details.aspx?FamilyId=5C28E38A-F323-4006-BEED-A00840CAFBCE>
Download the update (KB917152)
* Microsoft Office 2004 for Mac
* Microsoft Office v. X for Mac
Immune Systems:
* Microsoft Works Suites:
* Microsoft Works Suite 2004
* Microsoft Works Suite 2005
* Microsoft Works Suite 2006
Microsoft Office Parsing Vulnerability -
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1316>
CVE-2006-1316
A remote code execution vulnerability exists in Office, and could be
exploited when a malformed string included in an Office file was parsed by
any of the affected Office applications. Such a string might be included
in an email attachment processed by one of the affected applications or
hosted on a malicious web site. Viewing or previewing a malformed email
message in an affected version of Outlook could not lead to exploitation
of this vulnerability. An attacker could exploit the vulnerability by
constructing a specially crafted Office file that could allow remote code
execution.
If a user were logged on with administrative user rights, an attacker who
successfully exploited this vulnerability 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. Users whose
accounts are configured to have fewer user rights on the system could be
less affected than users who operate with administrative user rights.
Mitigating Factors for Microsoft Office Parsing Vulnerability -
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1316>
CVE-2006-1316:
* An attacker who successfully exploited this vulnerability could gain
the same user rights as the local user. 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.
* On Outlook 2002 and Outlook 2003, the vulnerability could not be
exploited automatically through e-mail. For an attack to be successful a
user must accept a prompt confirming that they Open, Save or Cancel the
attachment that is sent in an e-mail message before the exploit could
occur.
* In a Web-based attack scenario, an attacker could host a Web site that
contains a Web page that is used to exploit this vulnerability. In
addition, compromised Web sites and Web sites that accept or host
user-provided content or advertisements could contain specially crafted
content that could exploit this vulnerability. In all cases, however, an
attacker would have no way to force users to visit these Web sites.
Instead, an attacker would have to persuade users to visit the Web site,
typically by getting them to click a link in an e-mail message or instant
messenger message that takes users to the attacker's Web site.
Note Office 2000 does not prompt the user to Open, Save, or Cancel before
opening a document.
Workarounds for Microsoft Parsing Vulnerability -
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1316>
CVE-2006-1316:
Microsoft has tested the following workarounds. While these workarounds
will not correct the underlying vulnerability, they help block known
attack vectors. When a workaround reduces functionality, it is identified
in the following section.
Do not open or save Microsoft Office files that you receive from
un-trusted sources or that you received unexpectedly from trusted sources.
This vulnerability could be exploited when a user opens a file.
FAQ for Microsoft Office Parsing Vulnerability -
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1316>
CVE-2006-1316:
What is the scope of the vulnerability?
A remote code execution vulnerability exists in Office, and could be
exploited when a malformed string included in an Office file was parsed by
any of the affected Office applications. Such a string might be included
in an email attachment processed by one of the affected applications or
hosted on a malicious web site. Viewing or previewing a malformed email
message in an affected version of Outlook could not lead to exploitation
of this vulnerability. An attacker could exploit the vulnerability by
constructing a specially crafted Office file that could allow remote code
execution.
If a user were logged on with administrative user rights, an attacker who
successfully exploited this vulnerability 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. Users whose
accounts are configured to have fewer user rights on the system could be
less affected than users who operate with administrative user rights.
What causes the vulnerability?
When Office opens a specially crafted Office file and parses a malformed
string, it may corrupt system memory in such a way that an attacker could
execute arbitrary code.
What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could cause
arbitrary code to run with the privileges of the user who opened the file.
How could an attacker exploit the vulnerability?
In a Web-based attack scenario, an attacker could host a Web site that
contains a Web page that is used to exploit this vulnerability. In
addition, compromised Web sites and Web sites that accept or host
user-provided content or advertisements could contain specially crafted
content that could exploit this vulnerability. In all cases, however, an
attacker would have no way to force users to visit these Web sites.
Instead, an attacker would have to persuade users to visit the Web site,
typically by getting them to click a link in an e-mail message or instant
messenger message that takes users to the attacker's Web site.
In an e-mail attack scenario, an attacker could exploit the vulnerability
by sending a specially-crafted file to the user and by persuading the user
to open the file.
What systems are primarily at risk from the vulnerability?
Workstations and terminal servers are primarily at risk. Servers could be
at more risk if users who have sufficient administrative permissions are
given the ability to log on to servers and to run programs. However, best
practices strongly discourage allowing this.
What does the update do?
The update removes the vulnerability by modifying the way that Office
parses the length of a record before it passes the message to the
allocated buffer.
When this security bulletin was issued, had this vulnerability been
publicly disclosed?
No. Microsoft received information about this vulnerability through
responsible disclosure. Microsoft had not received any information to
indicate that this vulnerability had been publicly disclosed when this
security bulletin was originally issued. This security bulletin addresses
the privately disclosed vulnerability as well as additional issues
discovered through internal investigations.
When this security bulletin was issued, had Microsoft received any reports
that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this
vulnerability had been publicly used to attack customers and had not seen
any examples of proof of concept code published when this security
bulletin was originally issued.
Microsoft Office Malformed String Parsing Vulnerability -
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1540>
CVE-2006-1540:
A remote code execution vulnerability exists in Office, and could be
exploited when a malformed string included in an Office file was parsed by
any of the affected Office applications. Such a string might be included
in an email attachment processed by one of the affected applications or
hosted on a malicious web site. Viewing or previewing a malformed email
message in an affected version of Outlook could not lead to exploitation
of this vulnerability. An attacker could exploit the vulnerability by
constructing a specially crafted Office file that could allow remote code
execution.
If a user were logged on with administrative user rights, an attacker who
successfully exploited this vulnerability 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. Users whose
accounts are configured to have fewer user rights on the system could be
less affected than users who operate with administrative user rights.
Mitigating Factors for Microsoft Office Malformed String Parsing
Vulnerability -
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1540>
CVE-2006-1540:
* An attacker who successfully exploited this vulnerability could gain
the same user rights as the local user. 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.
* On Outlook 2002 and Outlook 2003, the vulnerability could not be
exploited automatically through e-mail. For an attack to be successful a
user must accept a prompt confirming that they Open, Save or Cancel the
attachment that is sent in an e-mail message before the exploit could
occur.
* In a Web-based attack scenario, an attacker could host a Web site that
contains a Web page that is used to exploit this vulnerability. In
addition, compromised Web sites and Web sites that accept or host
user-provided content or advertisements could contain specially crafted
content that could exploit this vulnerability. In all cases, however, an
attacker would have no way to force users to visit these Web sites.
Instead, an attacker would have to persuade users to visit the Web site,
typically by getting them to click a link in an e-mail message or instant
messenger message that takes users to the attacker's Web site.
Note Office 2000 does not prompt the user to Open, Save, or Cancel before
opening a document.
Workarounds for Microsoft Office Malformed String Parsing Vulnerability -
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1540>
CVE-2006-1540:
Microsoft has tested the following workarounds. While these workarounds
will not correct the underlying vulnerability, they help block known
attack vectors. When a workaround reduces functionality, it is identified
in the following section.
Do not open or save Microsoft Office files that you receive from
un-trusted sources or that you received unexpectedly from trusted sources.
This vulnerability could be exploited when a user opens a file.
FAQ for Microsoft Office Malformed String Parsing Vulnerability -
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1540>
CVE-2006-1540:
What is the scope of the vulnerability?
This is a remote code execution vulnerability. An attacker who
successfully exploited this vulnerability could remotely take complete
control of an affected system.
If a user were logged on with administrative user rights, an attacker who
successfully exploited this vulnerability 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. Users whose
accounts are configured to have fewer user rights on the system could be
less affected than users who operate with administrative user rights.
What causes the vulnerability?
When Office opens a specially crafted Office file and parses a malformed
string, it may corrupt system memory in such a way that an attacker could
execute arbitrary code.
What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could cause
arbitrary code to run with the privileges of the user who opened the file.
How could an attacker exploit the vulnerability?
In a Web-based attack scenario, an attacker could host a Web site that
contains a Web page that is used to exploit this vulnerability. In
addition, compromised Web sites and Web sites that accept or host
user-provided content or advertisements could contain specially crafted
content that could exploit this vulnerability. In all cases, however, an
attacker would have no way to force users to visit these Web sites.
Instead, an attacker would have to persuade users to visit the Web site,
typically by getting them to click a link in an e-mail message or instant
messenger message that takes users to the attacker's Web site.
In an e-mail attack scenario, an attacker could exploit the vulnerability
by sending a specially-crafted file to the user and by persuading the user
to open the file.
What systems are primarily at risk from the vulnerability?
Workstations and terminal servers are primarily at risk. Servers could be
at more risk if users who have sufficient administrative permissions are
given the ability to log on to servers and to run programs. However, best
practices strongly discourage allowing this.
What does the update do?
The update removes the vulnerability by modifying the way that Office
parses the length of a record before it passes the message to the
allocated buffer.
When this security bulletin was issued, had this vulnerability been
publicly disclosed?
Yes. While the initial report was provided through responsible disclosure,
the vulnerability was later disclosed publicly. This security bulletin
addresses the publicly disclosed vulnerability as well as additional
issues discovered through internal investigations.
When this security bulletin was issued, had Microsoft received any reports
that this vulnerability was being exploited?
Yes. When the security bulletin was released, Microsoft had received
information that this vulnerability was being exploited.
Microsoft Office Property Vulnerability -
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2389>
CVE-2006-2389
A remote code execution vulnerability exists in Office, and could be
exploited when a malformed property included in an Office file was parsed
by any of the affected Office applications. Such a property might be
included in an email attachment processed by one of the affected
applications or hosted on a malicious web site. Viewing or previewing a
malformed email message in an affected version of Outlook could not lead
to exploitation of this vulnerability. An attacker could exploit the
vulnerability by constructing a specially crafted Office file that could
allow remote code execution.
If a user were logged on with administrative user rights, an attacker who
successfully exploited this vulnerability 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. Users whose
accounts are configured to have fewer user rights on the system could be
less affected than users who operate with administrative user rights.
Mitigating Factors for Microsoft Office Property Vulnerability -
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2389>
CVE-2006-2389:
* An attacker who successfully exploited this vulnerability could gain
the same user rights as the local user. 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.
* On Outlook 2002 and Outlook 2003, the vulnerability could not be
exploited automatically through e-mail. For an attack to be successful a
user must accept a prompt confirming that they Open, Save or Cancel the
attachment that is sent in an e-mail message before the exploit could
occur.
* In a Web-based attack scenario, an attacker could host a Web site that
contains a Web page that is used to exploit this vulnerability. In
addition, compromised Web sites and Web sites that accept or host
user-provided content or advertisements could contain specially crafted
content that could exploit this vulnerability. In all cases, however, an
attacker would have no way to force users to visit these Web sites.
Instead, an attacker would have to persuade users to visit the Web site,
typically by getting them to click a link in an e-mail message or instant
messenger message that takes users to the attacker's Web site.
Note Office 2000 does not prompt the user to Open, Save, or Cancel before
opening a document.
Workarounds for Microsoft Property Vulnerability -
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2389>
CVE-2006-2389:
Microsoft has tested the following workarounds. While these workarounds
will not correct the underlying vulnerability, they help block known
attack vectors. When a workaround reduces functionality, it is identified
in the following section.
Do not open or save Microsoft Office files that you receive from
un-trusted sources or that you received unexpectedly from trusted sources.
This vulnerability could be exploited when a user opens a file.
FAQ for Microsoft Office Property Vulnerability -
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-2389>
CVE-2006-2389:
What is the scope of the vulnerability?
A remote code execution vulnerability exists in Office, and could be
exploited when a malformed property included in an Office file was parsed
by any of the affected Office applications. Such a property might be
included in an email attachment processed by one of the affected
applications or hosted on a malicious web site. Viewing or previewing a
malformed email message in an affected version of Outlook could not lead
to exploitation of this vulnerability. An attacker could exploit the
vulnerability by constructing a specially crafted Office file that could
allow remote code execution.
If a user were logged on with administrative user rights, an attacker who
successfully exploited this vulnerability 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. Users whose
accounts are configured to have fewer user rights on the system could be
less affected than users who operate with administrative user rights.
What causes the vulnerability?
When Office opens a specially crafted Office file and parses a malformed
property, it may corrupt system memory in such a way that an attacker
could execute arbitrary code.
What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could cause
arbitrary code to run with the privileges of the user who opened the file.
How could an attacker exploit the vulnerability?
In a Web-based attack scenario, an attacker could host a Web site that
contains a Web page that is used to exploit this vulnerability. In
addition, compromised Web sites and Web sites that accept or host
user-provided content or advertisements could contain specially crafted
content that could exploit this vulnerability. In all cases, however, an
attacker would have no way to force users to visit these Web sites.
Instead, an attacker would have to persuade users to visit the Web site,
typically by getting them to click a link in an e-mail message or instant
messenger message that takes users to the attacker's Web site.
In an e-mail attack scenario, an attacker could exploit the vulnerability
by sending a specially-crafted file to the user and by persuading the user
to open the file.
What systems are primarily at risk from the vulnerability?
Workstations and terminal servers are primarily at risk. Servers could be
at more risk if users who have sufficient administrative permissions are
given the ability to log on to servers and to run programs. However, best
practices strongly discourage allowing this.
What does the update do?
The update removes the vulnerability by modifying the way that Office
parses the length of a record before it passes the message to the
allocated buffer.
When this security bulletin was issued, had this vulnerability been
publicly disclosed?
No. Microsoft received information about this vulnerability through
responsible disclosure. Microsoft had not received any information to
indicate that this vulnerability had been publicly disclosed when this
security bulletin was originally issued. This security bulletin addresses
the privately disclosed vulnerability as well as additional issues
discovered through internal investigations.
When this security bulletin was issued, had Microsoft received any reports
that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this
vulnerability had been publicly used to attack customers and had not seen
any examples of proof of concept code published when this security
bulletin was originally issued.
ADDITIONAL INFORMATION
The information has been provided by Microsoft Security.
The original article can be found at:
<http://www.microsoft.com/technet/security/Bulletin/MS06-038.mspx>
http://www.microsoft.com/technet/security/Bulletin/MS06-038.mspx
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