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

              AUSCERT External Security Bulletin Redistribution
                             
           ESB-1999.193 -- Microsoft Security Bulletin (MS99-056)
         Patch Available for "Syskey Keystream Reuse" Vulnerability
                              17 December 1999

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

Microsoft Corporation has released the following security bulletin
concerning a cryptographic weakness in Windows NT 4.0's Syskey utility. 
This vulnerability may reduce the work required in cryptanalytic attacks
against the Security Account Manager (SAM) database.  Microsoft has
released a patch which eliminates this particular vulnerability:

       http://www.microsoft.com/security/bulletins/MS99-056.asp


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

This security bulletin is provided as a service to AusCERT's members.
As AusCERT did not write the document referenced above, AusCERT has
had no control over its content.  The decision to use any or all
of this information is the responsibility of each user or organisation,
and should be done so in accordance with site policies and procedures.

If you have any questions or need further information, please contact 
Microsoft Corporation directly.

Previous advisories and external security bulletins can be retrieved from:

	http://www.auscert.org.au/Information/advisories.html

If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security
Teams).

Internet Email: auscert@auscert.org.au
Facsimile:	(07) 3365 7031
Telephone:	(07) 3365 4417 (International: +61 7 3365 4417)
		AusCERT personnel answer during Queensland business hours
		which are GMT+10:00 (AEST).
		On call after hours for emergencies.


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