Microsoft Security Bulletin MS99-023 - Important
Patch Available for "Malformed Image Header" Vulnerability
Published: June 30, 1999 | Updated: March 10, 2003
Patch Availability Information Updated: March 10, 2003
Originally Posted: June 30, 1999
Microsoft has released a patch that eliminates a vulnerability that could allow denial of service attacks against Microsoft® Windows NT® servers, workstations, and terminal servers. This patch already is available as part of Windows NT Server Service Pack 5, but is being provided as a stand-alone patch for the benefit of users who have entered Y2K lockdown on Service Pack 4.
Frequently asked questions regarding this vulnerability can be found at http://www.microsoft.com/technet/security/bulletin/fq99-023.mspx
If an executable file with a specially-malformed image header is executed, it will cause a system failure. The affected machine will need to be rebooted in order to place it back in service. Any work that was in progress when the machine crashed could be lost.
Affected Software Versions
- Microsoft Windows NT Server 4.0
- Microsoft Windows NT Workstation 4.0
- Microsoft Windows NT Server 4.0, Terminal Server Edition
Vulnerability Identifier: CVE-1999-0726
- Windows NT Server and Workstation 4.0: http://www.microsoft.com/technet/security/patchavailability.mspx
- Windows NT Server 4.0, Terminal Server Edition: http://www.microsoft.com/technet/security/patchavailability.mspx
Please see the following references for more information related to this issue.
Microsoft Security Bulletin MS99-023: Frequently Asked Questions, http://www.microsoft.com/technet/security/bulletin/fq99-023.mspx.
Microsoft Knowledge Base (KB) article 234557, Executable with a Specially-Malformed Image Header May Crash Windows NT, http://support.microsoft.com/default.aspx?scid=kb;en-us;234557&sd=tech.
(Note It may take 24 hours from the original posting of this bulletin for the KB article to be visible; however, a copy will be immediately available in the patch folder.)
Microsoft Security web site, http://www.microsoft.com/technet/security/default.mspx .
Obtaining Support on this Issue
This is a fully supported patch. Information on contacting Microsoft Technical Support is available at http://support.microsoft.com/contactussupport/?ws=support.
- June 30, 1999: Bulletin Created.
- V2.0 (March 10, 2003): Introduced versioning and updated patch availability information
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