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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 ([email protected])

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