Microsoft Security Bulletin MS03-033: Unchecked Buffer in MDAC Function Could Enable System Compromise (Q823718)

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Title:      Unchecked Buffer in MDAC Function Could Enable System 
Compromise (823718)
Date:       20 August 2003
Software:   
 - Microsoft Data Access Components 2.5 
 - Microsoft Data Access Components 2.6 
 - Microsoft Data Access Components 2.7 

Impact:     Run code of the attacker's choice
Max Risk:   Important
Bulletin:   MS03-033

Microsoft encourages customers to review the Security Bulletins 
at: 
http://www.microsoft.com/technet/security/bulletin/MS03-033.asp
http://www.microsoft.com/security/security_bulletins/ms03-033.asp
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Issue:
======
Microsoft Data Access Components (MDAC) is a collection of 
components that are used to provide database connectivity on 
Windows platforms. MDAC is a ubiquitous technology, and it is 
likely to be present on most Windows systems:
 
 - By default, MDAC is included by default as part of Microsoft
   Windows XP, Windows 2000, Windows Millennium Edition, and
   Windows Server 2003. (It is worth noting, though, that the
   version that is installed by Windows Server 2003 does not have
   this vulnerability.) 
 - MDAC is available for download as a stand-alone technology. 
 - MDAC is either included in or installed by a number of other
   products and technologies. For example, MDAC is included in
   the Microsoft Windows NT(r) 4.0 Option Pack and in Microsoft SQL
   Server 2000. Additionally, some MDAC components are present as
   part of Microsoft Internet Explorer even when MDAC itself is
   not installed.
 
MDAC provides the underlying functionality for a number of 
database operations, such as connecting to remote databases and 
returning data to a client. When a client system on a network 
tries to see list of computers that are running SQL Server and 
that reside on the network, it sends a broadcast request to all 
the devices that are on the network. Due to a flaw in a specific 
MDAC component, an attacker could respond with a specially 
crafted packet that could cause a buffer overflow.
 
An attacker who successfully exploited this flaw could gain the 
same level of privileges over the system as the application that 
initiated the broadcast request. The actions an attacker could 
carry out would be dependent on the permissions which the 
application using MDAC ran under. If the application ran with 
limited privileges, an attacker would be limited accordingly; 
however, if the application runs under the local system context, 
the attacker would have the same level of permissions. This could 
include creating, modifying, or deleting data on the system, or 
reconfiguring the system. This could also include reformatting 
the hard disk or running programs of the attacker's choice. 

This bulletin supercedes the patch discussed in MS02-040. 
Customers should install this patch as it contains the fix for 
the vulnerability discussed in bulletin MS02-040 and the patch 
discussed in this bulletin. 

Mitigating Factors:
====================
 - For an attack to be successful an attacker would need to
   simulate a SQL server on the same subnet as the target system. 
 - Code executed on the client system would only run under the
   privileges of the logged-on user. 
 - MDAC version 2.8 (which is the version included with Windows
   Server 2003) does not contain the flaw that is addressed by
   this bulletin. 

Risk Rating:
============
 - Important

Patch Availability:
===================
 - A patch is available to fix this vulnerability. Please read
   the Security Bulletins at:

   http://www.microsoft.com/technet/security/bulletin/ms03-
033.asp
   http://www.microsoft.com/security/security_bulletins/ms03-
033.asp

   for information on obtaining this patch.

Acknowledgment:
===============
 - Microsoft thanks Aaron C. Newman of Application Security, Inc.
   for reporting this issue to us and for working with us to help
   protect customers.
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