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AUSCERT External Security Bulletin Redistribution
ESB-1999.163 -- Microsoft Security Bulletin (MS99-046)
Patch Available to Improve TCP Initial Sequence Number Randomness
25 October 1999
Microsoft Corporation has released the following security bulletin
concerning a vulnerability in the randomness of TCP initial sequence
numbers of the Microsoft TCP/IP stack.
All Microsoft Windows NT 4.0 platforms are affected by this vulnerability.
This vulnerability may allow IP address spoofing attacks and network
sessions to be hijacked.
Microsoft have issued a patch which corrects this vulnerability:
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:
If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security
Internet Email: firstname.lastname@example.org
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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