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              AUSCERT External Security Bulletin Redistribution
                             
           ESB-1999.109 -- Microsoft Security Bulletin (MS99-028)
        "Terminal Server connection request flooding" Vulnerability
                               10 August 1999

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Microsoft Corporation has released the following security bulletin
concerning a denial of service vulnerability in Microsoft Windows
NT Terminal Server.  If connection requests are not filtered, a
remote attacker could mount a denial of service attack by levying
a large number of bogus new connection requests and consuming all
memory on the Terminal Server.  In extreme cases the server could
crash in the face of such an attack.

The patch mentioned in the bulletin works by causing the server to
require authentication before processing the connection request:

       http://www.microsoft.com/security/bulletins/MS99-028.asp

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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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