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REVISED: Microsoft Security Bulletin MS02-040: Unchecked Buffer in MDAC Function Could Enable System (Q326573)
From: "Microsoft" <0_51325_04BF067D-4CF8-4245-B5C1-58573E5746A8_US () Newsletters Microsoft com>
Date: Wed, 20 Aug 2003 12:45:00 -0700
-----BEGIN PGP SIGNED MESSAGE----- - ---------------------------------------------------------------------- Title: Unchecked Buffer in MDAC Function Could Enable System Compromise (Q326573) Released: 31 July 2003 Revised: 20 August 2003 (version 2.0) 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: Critical Bulletin: MS02-040 Microsoft encourages customers to review the Security Bulletin at: http://www.microsoft.com/technet/security/bulletin/MS02-040.asp http://www.microsoft.com/security/security_bulletins/MS02-040.asp - ---------------------------------------------------------------------- Reason for Revision: ==================== Subsequent to the release of this bulletin, it was determined that the vulnerability addressed is not with the OpenRowSet command (which is a Microsoft SQL Server command) but rather that the vulnerability is with the underlying MDAC component Open Database Connectivity (ODBC), which is present in all versions of Windows. Additionally, the original patch released with this did not install correctly on some systems because of a flaw in the way that Microsoft Windows Installer updated the System File Protection cache. The bulletin has been updated to include this additional information and to direct users to an updated patch. Note: The patch for this security bulletin has been superceded by the patch in MS03-033. Customers who are seeking the patch for MS02-040 should instead install the patch for MS03-033. Issue: ====== 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 as part of Microsoft Windows XP, Windows 2000, and Windows Millennium Edition. 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, as part of Microsoft Access, and as part of SQL Server. Some MDAC components are also present as part of Microsoft Internet Explorer even if 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. Specifically, it is the MDAC component known as Open Database Connectivity (ODBC) that provides this functionality. A security vulnerability results because one of the ODBC functions in MDAC that is used to connect to data sources contains an unchecked buffer. An attacker could seek to exploit the vulnerability by constructing a Web page that, when visited by the user, could execute code of the attacker's choice with the user's privileges. The Web page could be hosted on a Web site or sent directly to the user in an e-mail message. In the case of a system that is running SQL Server, an attacker could seek to exploit this vulnerability by using the Transact-SQL OpenRowSet command. An attacker who submits a database query that contains a specially-malformed parameter within a call to OpenRowSet could overrun the buffer, either to cause the computer that is running SQL Server to fail or to cause the computer that is running SQL Server to take actions that are dictated by the attacker. Mitigating Factors: ==================== - - Users who read e-mail messages as plain text would have to take an action before an attacker could exploit the vulnerability to be exploited. - - Systems that are configured to disable active scripting in Internet Explorer are not affected by this vulnerability. - - In the Web-based attack scenario, a user would need to visit a malicious web site under the control of an attacker. An attacker would have no way to force users to visit a malicious Web site outside the HTML e-mail vector. Instead, an attacker would need to lure them there, typically by getting the user to click a link that took them to the attacker's site. - - The privileges that are gained through a successful attack would be equal to those of the application under which ODBC is running. In most cases, an attacker would gain only the same level of privileges as the logged on user. - - By default, Outlook Express 6.0 and Outlook 2002 open HTML mail in the Restricted Sites Zone. In addition, Outlook 98 and 2000 open HTML mail in the Restricted Sites Zone if the Outlook Email Security Update has been installed. Customers who use any of these products would be at no risk from an e-mail borne attack that attempted to exploit this vulnerability unless the user clicked a malicious link in the email. Risk Rating: ============ Critical Patch Availability: =================== A patch is available to fix this vulnerability. Please read the Security Bulletins at http://www.microsoft.com/technet/security/bulletin/ms02-040.asp http://www.microsoft.com/security/security_bulletins/MS02-040.asp for information on obtaining this patch. Please note that this patch is superceded by the patch available with http://www.microsoft.com/technet/security/bulletin/ms03-033.asp Acknowledgment: =============== - - David Litchfield, Next Generation Security Software Ltd., http://www.nextgenss.com/. - --------------------------------------------------------------------- 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. 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SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. -----BEGIN PGP SIGNATURE----- Version: PGP 7.1 iQEVAwUBP0OazI0ZSRQxA/UrAQGD3gf/fLWBEizyjQur1t+PdI8oWVlp40LQSTIx quDg5GydPJrNiUwhRb2M25urmYm6My/ydh6U06GosDXWv1sxu8R/fAxvyYBjH4FS VOC+8vd3FjKDrIWeFrWyGbYgq/0TclPvRllCFhVJaJDkW2qb7gec//uHu0fDMkVd ftYoxrLZGq+JszlokotFZ4zlHv9WRY1mCASRiixOt2YhgxY+lnkHgHUb8EFTw5ZW BmBT00enYRD9SDuE+CkQaOxdpRfJHrFMV+CRHI4qyqt9y57bHwTEIyfyIS37G3hX E1ih9Jy6G8Msdbyut5Ku8O0Dl4AuQI1bRjhzGqDtHJiP2LbS+ci16g== =Md0Y -----END PGP SIGNATURE----- ******************************************************************* You have received this e-mail bulletin because of your subscription to the Microsoft Product Security Notification Service. For more information on this service, please visit http://www.microsoft.com/technet/security/notify.asp. 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- REVISED: Microsoft Security Bulletin MS02-040: Unchecked Buffer in MDAC Function Could Enable System (Q326573) Microsoft (Aug 20)