• Article

Security Bulletin

Microsoft Security Bulletin MS99-059 - Important

Patch Available for "Malformed TDS Packet Header" Vulnerability

Published: December 20, 1999

Version: 1.0

Originally Posted: December 20, 1999

Summary

Microsoft has released a patch that eliminates a security vulnerability in Microsoft® SQL Server™ 7.0. The vulnerability could cause a SQL server to crash.

Frequently asked questions regarding this vulnerability can be found at https://www.microsoft.com/technet/security/bulletin/fq99-059.mspx.

Issue

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

Vulnerability Identifier: CVE-1999-0999

Patch Availability

  • Intel:
    https:

  • alpha:
    </https:>https:

    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, https://www.microsoft.com/technet/security/bulletin/fq99-059.mspx.

  • Microsoft Knowledge Base (KB) article 248749, FIX: Possible Denial of Service Attack with Appropriate NULL Bytes in TDS Header, </https:>https:.
    (Note: It may take 24 hours from the original posting of this bulletin for this KB article to be visible.)

  • Microsoft Security web site, </https:>https:.

Obtaining Support on this Issue

This is a fully supported patch. Information on contacting Microsoft Technical Support is available at </https:>https:.

Acknowledgments

Microsoft acknowledges Kevork Belian for bringing this issue to our attention.

Revisions

  • December 20, 1999: Bulletin Created.

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