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Vulnerabilities in Microsoft Visio Allows Code Execution (MS07-030)
------------------------------------------------------------------------
SUMMARY
This important update resolves two privately reported vulnerabilities in
addition to other security issues identified during the course of the
investigation. The privately reported vulnerabilities could allow remote
code execution if a user opened a specially crafted Visio file. 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. User interaction is required to exploit these vulnerabilities.
DETAILS
Affected Software:
* Microsoft Office 2003
* Microsoft Visio 2003 Service Pack 2
Non-Affected Software:
*2007 Microsoft Office System
*Microsoft Office Visio 2007
Version Number Memory Corruption Vulnerability - CVE-2007-0934:
A remote code execution vulnerability exists in the way Microsoft Visio
handles a specially crafted version number in a Visio (.VSD, VSS, or .VST)
file. An attacker could exploit this vulnerability when Visio does not
correctly validate the version number field when processing the contents
of a file. Such a specially crafted file might be included as an e-mail
attachment, or hosted on a malicious or compromised Web site.
To view this vulnerability as a standard entry in the Common
Vulnerabilities and Exposures list, see
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-0934>
CVE-2007-0934.
Mitigating Factors for Version Number Memory Corruption Vulnerability -
CVE-2007-0934:
Mitigation refers to a setting, common configuration, or general
best-practice, existing in a default state, that could reduce the severity
of exploitation of a vulnerability. The following mitigating factors may
be helpful in your situation:
* 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, Web sites that accept or host user-provided content, or
compromised Web sites and advertisement servers 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.
* 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.
* The vulnerability cannot be exploited automatically through e-mail. For
an attack to be successful a user must open an attachment that is sent in
an e-mail message.
* Microsoft Office Visio 2007 is not affected by this vulnerability.
Workarounds for Version Number Memory Corruption Vulnerability -
CVE-2007-0934:
Workaround refers to a setting or configuration change that does not
correct the underlying vulnerability but would help block known attack
vectors before you apply the update. Microsoft has tested the following
workarounds and states in the discussion whether a workaround reduces
functionality:
* Use Microsoft Visio Viewer 2003 or Microsoft Visio Viewer 2007 to open
and view files. Microsoft Visio Viewer 2003 and Microsoft Visio Viewer
2007 are not affected by the issue. Users can download the Microsoft Visio
Viewer 2003 and Microsoft Visio Viewer 2007 from the Microsoft Download
Center.
* Do not open or save Microsoft Visio files that you receive from
untrusted sources or that you receive unexpectedly from trusted sources.
FAQ for Version Number Memory Corruption Vulnerability - CVE-2007-0934
What is the scope of the vulnerability?
A remote code execution vulnerability exists in Microsoft Visio. An
attacker could exploit this vulnerability could remotely 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 impacted than users who operate with
administrative user rights.
What causes the vulnerability?
Microsoft Visio does not correctly validate the version number field when
processing version related data of a file.
What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could run
arbitrary code on a user s system. This could allow an attacker to take
complete control of the affected system.
How could an attacker exploit the vulnerability?
This vulnerability requires that a user open a specially crafted Visio
file with an affected version of Microsoft Visio.
In an e-mail attack scenario, an attacker could exploit the vulnerability
by sending a specially-crafted file to the user and by convincing the user
to open the file.
In a Web-based attack scenario, an attacker would have to host a Web site
that contains a Visio file that is used to attempt to exploit this
vulnerability. In addition, compromised Web sites and Web sites that
accept or host user-provided content could contain specially crafted
content that could exploit this vulnerability. An attacker would have no
way to force users to visit a specially crafted Web site. Instead, an
attacker would have to persuade them to visit the Web site, typically by
getting them to click a link that takes them to the attacker's site.
What systems are primarily at risk from the vulnerability?
Workstations and terminal servers that have Microsoft Visio installed 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.
What does the update do?
The update removes the vulnerability by modifying the way that Microsoft
Visio handles the validation of Visio file version related data.
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.
Visio Document Packaging Vulnerability - CVE-2007-0936:
A remote code execution vulnerability exists in Microsoft Visio as a
result of the way it incorrectly handles the parsing of packed objects
within the Visio file format. An attacker could exploit this vulnerability
by constructing a malicious Visio (.VSD, VSS, or .VST) file that could
potentially allow remote code execution if a user visited a malicious Web
site or opened a specially crafted Visio attachment included in an e-mail
message. An attacker who successfully exploited this vulnerability could
take complete control of an affected system.
To view this vulnerability as a standard entry in the Common
Vulnerabilities and Exposures list, see
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-0936>
CVE-2007-0936.
Mitigating Factors for Visio Document Packaging Vulnerability -
CVE-2007-0936:
Mitigation refers to a setting, common configuration, or general
best-practice, existing in a default state, that could reduce the severity
of exploitation of a vulnerability. The following mitigating factors may
be helpful in your situation:
* 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, Web sites that accept or host user-provided content, or
compromised Web sites and advertisement servers 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.
* 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.
* The vulnerability cannot be exploited automatically through e-mail. For
an attack to be successful a user must open an attachment that is sent in
an e-mail message.
* Microsoft Office Visio 2007 is not affected by this vulnerability.
Workarounds for Visio Document Packaging Vulnerability - CVE-2007-0936:
Workaround refers to a setting or configuration change that does not
correct the underlying vulnerability but would help block known attack
vectors before you apply the update. Microsoft has tested the following
workarounds and states in the discussion whether a workaround reduces
functionality:
* Use Microsoft Visio Viewer 2003 or Microsoft Visio Viewer 2007 to open
and view files. Microsoft Visio Viewer 2003 and Microsoft Visio Viewer
2007 are not affected by the issue. Users can download the Microsoft Visio
Viewer 2003 and Microsoft Visio Viewer 2007 from the Microsoft Download
Center.
* Do not open or save Microsoft Visio files that you receive from
untrusted sources or that you receive unexpectedly from trusted sources.
This vulnerability could be exploited when a user opens a specially
crafted file.
FAQ for Visio Document Packaging Vulnerability - CVE-2007-0936:
What is the scope of the vulnerability?
A remote code execution vulnerability exists in Microsoft Visio. An
attacker who successfully exploited this vulnerability could remotely 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 impacted than users who operate with
administrative user rights.
What causes the vulnerability?
Visio incorrectly handles the parsing of a packed object resulting in
memory corruption.
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?
This vulnerability requires that a user open a specially crafted Visio
file with an affected version of Microsoft Visio.
In an e-mail attack scenario, an attacker could exploit the vulnerability
by sending a specially-crafted file to the user and by convincing the user
to open the file.
In a Web-based attack scenario, an attacker would have to host a Web site
that contains a Visio file that is used to attempt to exploit this
vulnerability. In addition, compromised Web sites and Web sites that
accept or host user-provided content could contain specially crafted
content that could exploit this vulnerability. An attacker would have no
way to force users to visit a specially crafted Web site. Instead, an
attacker would have to persuade them to visit the Web site, typically by
getting them to click a link that takes them to the attacker's site.
What systems are primarily at risk from the vulnerability?
Workstations and terminal servers that have Microsoft Visio installed 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.
What does the update do?
The update removes the vulnerability by modifying the way that Visio
validates packaging and parsing related data in a Visio file (.VSS, .VSD,
or .VST) file.
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 MS07-030.
The original article can be found at:
<http://www.microsoft.com/technet/security/bulletin/ms07-030.mspx>
Microsoft Security Bulletin MS07-030 - Important
========================================
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