Microsoft Security Bulletin (MS99-059)

--------------------------------------



Patch Available for "Malformed TDS Packet Header" Vulnerability

Originally Posted: December 20, 1999



Summary

=======

Microsoft has released a patch that eliminates a security vulnerability in

Microsoft(r) SQL  Server(r) 7.0. The vulnerability could cause a SQL server

to crash.



Frequently asked questions regarding this vulnerability can be found at

http://www.microsoft.com/security/bulletins/MS99-059faq.asp.



Issue

=====

If a specially-malformed TDS packet is sent to a SQL server, it can cause

the SQL service to crash. This vulnerability would not allow any

inappropriate access to the data on the server, nor would it allow a

malicious user to usurp any administrative control on the machine. An

affected machine could be put back into service by restarting the SQL

service. This vulnerability could only be remotely exploited if port 1433

were open at the firewall.



Affected Software Versions

==========================

 - Microsoft SQL Server 7.0



Patch Availability

==================

 - Intel:

   http://www.microsoft.com/Downloads/Release.asp?ReleaseID=16923

 - alpha:

   http://www.microsoft.com/Downloads/Release.asp?ReleaseID=16924



NOTE: This patch does not locate the SQL folder and install the patched

files into it; instead,  you must copy the three files contained in it to

the MSSQL7/BINN folder.



NOTE: Additional security patches are available at the Microsoft Download

Center



More Information

================

Please see the following references for more information related to this

issue.

 - Microsoft Security Bulletin MS99-059: Frequently Asked Questions,

   http://www.microsoft.com/security/bulletins/MS99-059faq.asp.

 - Microsoft Knowledge Base (KB) article Q248749,

   FIX: Possible Denial of Service Attack with Appropriate NULL Bytes in

   TDS Header,

   http://support.microsoft.com/support/kb/articles/q248/7/49.asp.

   (Note: It may take 24 hours from the original posting of this bulletin

   for this KB article to be visible.)

 - Microsoft Security Advisor web site,

   http://www.microsoft.com/security/default.asp.



Obtaining Support on this Issue

===============================

This is a fully supported patch. Information on contacting Microsoft

Technical Support is available at

http://support.microsoft.com/support/contact/default.asp.



Acknowledgments

===============

Microsoft acknowledges Kevork Belian for bringing this issue to our

attention.



Revisions

=========

 - December 20, 1999: Bulletin Created.



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