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AUSCERT External Security Bulletin Redistribution
ESB-1999.148 -- Microsoft Security Bulletin (MS99-38)
Patch Available for "Spoofed Route Pointer" Vulnerability
21 September 1999
Microsoft Corporation has released the following security bulletin
concerning a vulnerability in the anti-source routing feature of
Windows NT 4 service pack 5 and 9X operating systems. By manipulating
information within the route pointer of a data packet, it is possible
to bypass the anti-source routing feature. The patch described in
the bulletin also allows single-homed machines to disable source
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: email@example.com
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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