Vulnerability Note VU#225555

Microsoft SQL Server contains buffer overflow in pwdencrypt() function

Overview

The Microsoft SQL Server contains a buffer overflow vulnerability that may allow remote attackers to execute arbitrary code with system privileges.

I. Description

The Microsoft SQL Server provides multiple methods for users to authenticate to SQL databases. When SQL Server Authentication is used, the username and password of each database user is stored in a database on the SQL server. When users supply a password to the server using this method, a function named pwdencrypt() is responsible for encrypting the user-supplied password so that it can be compared to the encrypted password stored on the SQL server. There is a buffer overflow in pwdencrypt() that allows remote attackers to execute arbitrary code on the SQL server by supplying a crafted password value. Successful exploitation of this vulnerability requires knowledge of a valid username and will cause the supplied code to execute with the privileges of the SQL service account.

II. Impact

This vulnerability allows remote attackers with knowledge of a valid username to execute arbitrary code with the privileges of the SQL service account. If the privileges of the service account are elevated via VU#796313, this vulnerability may result in compromise of the server host.

III. Solution

Apply a patch

Microsoft has published Security Bulletin MS02-034 to address this vulnerability. For more information, please see

http://www.microsoft.com/technet/security/bulletin/MS02-034.asp

This vulnerability also affects any products that include the Microsoft Desktop Engine (MSDE) 2000. For more information, please see

http://www.microsoft.com/technet/security/MSDEapps.asp

Systems Affected

Vendor	Status	Date Notified	Date Updated
Microsoft Corporation	Vulnerable	25-Jul-2002

References

http://www.microsoft.com/technet/security/bulletin/MS02-034.asp
http://www.microsoft.com/technet/security/MSDEapps.asp
http://support.microsoft.com/support/misc/kblookup.asp?id=Q316333
http://www.microsoft.com/technet/prodtechnol/sql/maintain/security/sql2ksec.asp
http://www.securityfocus.com/bid/5014
http://www.securityfocus.com/bid/5204
http://www.theregister.co.uk/content/4/26086.html

Credit

This vulnerability was reported by Martin Rakhmanoff to the Bugtraq mailing list on June 14, 2002.

This document was written by Jeffrey P. Lanza and is based upon information provided by Microsoft.

Other Information

Date Public:	2002-06-14
Date First Published:	2002-07-25
Date Last Updated:	2003-02-05
CERT Advisory:	CA-2002-22
CVE-ID(s):	CAN-2002-0624
NVD-ID(s):	CAN-2002-0624
US-CERT Technical Alerts:
Metric:	31.89
Document Revision:	26

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