Vulnerability Note VU#399260

Microsoft SQL Server 2000 contains heap buffer overflow in SQL Server Resolution Service

Overview

Microsoft SQL Server 2000 contains a remotely exploitable heap buffer overflow that allows attackers to execute arbitrary code with the same privileges as the SQL server.

I. Description

The SQL Server Resolution Service (SSRS) was introduced in Microsoft SQL Server 2000 to provide referral services for multiple server instances running on the same machine. The service listens for requests on UDP port 1434 and returns the IP address and port number of the SQL server instance that provides access to the requested database.

The SSRS contains a heap buffer overflow that allows an attacker to execute arbitrary code by sending a crafted request to port 1434/udp. The code within such a request will be executed by the server host with the privileges of the SQL Server service account.

II. Impact

This vulnerability allows unauthenticated remote attackers 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

This vulnerability was originally addressed by Microsoft in Security Bulletin MS02-039. In January 2003, Microsoft updated MS02-039 to recommend that customers apply the patch from Microsoft Security Bulletin MS02-061, which addresses additional vulnerabilities. For more information, please see

http://www.microsoft.com/technet/security/bulletin/MS02-039.asp

http://www.microsoft.com/technet/security/bulletin/MS02-061.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

Block port 1434/udp

As a workaround, system administrators can use a firewall to block port 1434/udp at an appropriate network border, thus preventing external attackers from exploiting this vulnerability.

Systems Affected

Vendor	Status	Date Updated
Cisco Systems Inc.	Vulnerable	27-Jan-2003
Microsoft Corporation	Vulnerable	25-Jul-2002

References

CA-2003-04
http://www.microsoft.com/technet/security/bulletin/MS02-039.asp
http://www.microsoft.com/technet/security/MSDEapps.asp
http://www.microsoft.com/technet/security/virus/alerts/slammer.asp
http://support.microsoft.com/support/misc/kblookup.asp?id=Q323875
http://www.microsoft.com/technet/prodtechnol/sql/maintain/security/sql2ksec.asp
http://www.nextgenss.com/advisories/mssql-udp.txt
http://www.nextgenss.com/vna/ms-sql.txt
http://www.securityfocus.com/bid/5310
http://www.cert.org/advisories/CA-2003-04.html

Credit

The CERT/CC thanks Microsoft for the information provided in their advisory and NGSSoftware for their discovery and analysis of this vulnerability.

This document was written by Jeffrey P. Lanza.

Other Information

Date Public	07/24/2002
Date First Published	07/26/2002 01:21:12 PM
Date Last Updated	02/05/2003
CERT Advisory	CA-2002-22
CVE Name	CAN-2002-0649
US-CERT Technical Alerts
Metric	43.28
Document Revision	43

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