Microsoft Security Bulletin MS03-038: Unchecked buffer in Microsoft Access Snapshot Viewer Could Allow Code Execution(827104)

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Title:      Unchecked buffer in Microsoft Access Snapshot Viewer 
Could Allow Code Execution (827104)
Date:       September 3, 2003
Software:   Microsoft Access 97
            Microsoft Access 2000
            Microsoft Access 2002
Impact:     Elevation of Privilege
Max Risk:   Moderate
Bulletin:   MS03-038

Microsoft encourages customers to review the Security Bulletins at:
   http://www.microsoft.com/technet/security/bulletin/MS03-038.asp 
   http://www.microsoft.com/security/security_bulletins/MS03-038.asp
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Issue:
======
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. 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.

Risk Rating:
============
 -Moderate

Patch Availability:
===================
 - A patch is available to fix this vulnerability. Please read the 
   Security Bulletins at
     http://www.microsoft.com/technet/security/bulletin/MS03-038.asp 
     http://www.microsoft.com/security/security_bulletins/MS03-
038.asp
   for information on obtaining this patch.

Acknowledgment:
===============
 - Oliver Lavery (oliver.lavery () sympatico ca) 
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