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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