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TUCoPS :: Windows Apps :: n-145.txt
Microsoft Access Snapshot Viewer Buffer Overrun Vulnerability (CIAC N-145)

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The U.S. Department of Energy
Computer Incident Advisory Capability
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INFORMATION BULLETIN

Microsoft Access Snapshot Viewer Buffer Overrun Vulnerability
[Microsoft Security Bulletin MS03-038]

September 3, 2003 21:00 GMT Number N-145
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PROBLEM: By using Microsoft Access Snapshot Viewer, information in a
Microsoft Access database can be shared with users that don't
have Microsoft Access installed. A vulnerability exists in the
Snapshot Viewer where parameter validations are not correctly
checked allowing for a buffer overrun.
SOFTWARE: Microsoft Access 97
Microsoft Access 2000
Microsoft Access 2002
DAMAGE: In the security context of the logged on user, an attacker
could execute arbitrary code of their choice because of an
unchecked buffer in the ActiveX control that Microsoft Access
Snapshot Viewer uses.
SOLUTION: Apply the appropriate Microsoft patch as described in their
bulletin.
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VULNERABILITY The risk is MEDIUM. Microsoft Access Snapshot Viewer is not
ASSESSMENT: installed by default. A user would have to be enticed to visit
a malicious website hosted by the attacker where the web page
could invoke control over the user's system.
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LINKS:
CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/n-145.shtml
ORIGINAL BULLETIN:
http://www.microsoft.com/technet/treeview/default.asp?url
=/technet/security/bulletin/MS03-038.asp
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[***** Start Microsoft Security Bulletin MS03-038 *****]

Microsoft Security Bulletin MS03-038

Unchecked buffer in Microsoft Access Snapshot Viewer Could Allow Code
Execution (827104)
Originally posted: September 3, 2003

Summary
Who should read this bulletin: Customers who use Microsoft® Access or
who use the downloadable Microsoft Access Snapshot Viewer

Impact of vulnerability: Allow an attacker to execute code of their choice

Maximum Severity Rating: Moderate

Recommendation: Customers who use Microsoft Access or who use the
downloadable Microsoft Access Snapshot Viewer should install the
security patch at their earliest opportunity.

End User Bulletin:
An end user version of this bulletin is available at:

http://www.microsoft.com/security/security_bulletins/ms03-038.asp.

Affected Software:

Microsoft Access 97
Microsoft Access 2000
Microsoft Access 2002

Technical details
Technical description:

With Microsoft Access Snapshot Viewer, you can distribute a snapshot of a
Microsoft Access database that allows the snapshot to be viewed without
having Access installed. For example, a customer may want to send a supplier
an invoice that is generated by using an Access database. With Microsoft
Access Snapshot Viewer, the customer can package the database so that the
supplier can view it and print it without having Access installed. The
Microsoft Access Snapshot Viewer is available with all versions of
Access - though it is not installed by default - and is also available
as a separate stand-alone download. The Snapshot Viewer is implemented
by using an ActiveX control.

A vulnerability exists because of a flaw in the way that Snapshot Viewer
validates parameters. Because the parameters are not correctly checked,
a buffer overrun can occur, which could allow an attacker to execute the
code of their choice in the security context of the logged-on user.

For an attack to be successful, an attacker would have to persuade a user
to visit a malicious Web site that is under the attacker’s control.

Mitigating factors:

The Microsoft Access Snapshot Viewer is not installed with Microsoft Office
by default.

An attacker would need to persuade a user to visit a website under the
attacker’s control for an attack to be successful.

An attacker’s code would run with the same permissions as the user. If a
user’s permissions were restricted the attacker would be similarly restricted.

Severity Rating: Microsoft Access (all versions) Moderate
The above assessment is based on the types of systems affected by the
vulnerability, their typical deployment patterns, and the effect that
exploiting the vulnerability would have on them.

Vulnerability identifier: CAN-2003-0665

Tested Versions:
Microsoft tested Access 2002, Access 2000, and Access 97 to assess whether
they are affected by this vulnerability. Previous versions are no longer
supported and may or may not be affected by this vulnerability.

Patch availability
Download locations for this patch

Access 2002:
http://microsoft.com/downloads/details.aspx?FamilyId=
B50D4863-1BBE-4009-9DF8-52D3A916D54F&displaylang=en

http://microsoft.com/office/ork/xp/journ/snpv1001a.htm (administrative
update only)

Access 2000:
http://microsoft.com/downloads/details.aspx?FamilyId=
F6CB9C8E-16E3-422D-86DD-7ED5671FB8D4&displaylang=en.

http://microsoft.com/office/ork/2000/journ/snpv0901.htm
(administrative update only)

Access 97:
Install the updated stand-alone Snapshot Viewer control. To do so, visit
the following Microsoft Web site:
http://www.microsoft.com/AccessDev/Articles/snapshot.htm

Stand-alone Snapshot Viewer Control:
http://www.microsoft.com/AccessDev/Articles/snapshot.htm

Additional information about this patch
Installation platforms:
The Microsoft Access 2002 patch can be installed on systems running
Microsoft Access 2002 with Office XP Service Pack 2 (The administrative
update can be installed on systems running Office XP Service Pack 1 as well).

The Microsoft Access 2000 patch can be installed on systems running Microsoft
Access 2000 with Office 2000 Service Pack 3.

The updated updated stand-alone Snapshot Viewer control can be installed on
all supported systems.

Inclusion in future service packs:
The fix for this issue will be included in any future service packs that
are released for the affected products.

Reboot needed: No

Patch can be uninstalled: No

Superseded patches: None.

Verifying patch installation:

For all versions of Access, verify that the version number of the
Snapview.ocx file is 10.0.5529.0.

Caveats:
None

Localization:
Localized versions of this patch are available at the locations discussed
in “Patch Availability”.

Obtaining other security patches:
Patches for other security issues are available from the following locations:

Security patches are available from the Microsoft Download Center, and can
be most easily found by doing a keyword search for "security_patch".

Patches for consumer platforms are available from the WindowsUpdate web site

Other information:

Acknowledgments
Microsoft thanks Oliver Lavery for reporting this issue to us and working
with us to protect customers.

Support:

Microsoft Knowledge Base article 827104 discusses this issue and will be
available approximately 24 hours after the release of this bulletin.
Knowledge Base articles can be found on the Microsoft Online Support web
site.

Technical support is available from Microsoft Product Support Services.
There is no charge for support calls associated with security patches.
Security Resources: The Microsoft TechNet Security Web Site provides
additional information about security in Microsoft products.

Disclaimer:
The information provided in the Microsoft Knowledge Base is provided
"as is" without warranty of any kind. Microsoft disclaims all warranties,
either express or implied, including the warranties of merchantability and
fitness for a particular purpose. In no event shall Microsoft Corporation
or its suppliers be liable for any damages whatsoever including direct,
indirect, incidental, consequential, loss of business profits or special
damages, even if Microsoft Corporation or its suppliers have been advised
of the possibility of such damages. Some states do not allow the exclusion
or limitation of liability for consequential or incidental damages so the
foregoing limitation may not apply.

Revisions:
V1.0 (September 3, 2003): Bulletin published.

[***** End Microsoft Security Bulletin MS03-038 *****]
_______________________________________________________________________________

CIAC wishes to acknowledge the contributions of Microsoft Corp. for the
information contained in this bulletin.
_______________________________________________________________________________

CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding
member of FIRST, the Forum of Incident Response and Security Teams, a
global organization established to foster cooperation and coordination
among computer security teams worldwide.

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This document was prepared as an account of work sponsored by an
agency of the United States Government. Neither the United States
Government nor the University of California nor any of their
employees, makes any warranty, express or implied, or assumes any
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