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- CA-91:11 CERT Advisory
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- August 14, 1991
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- ULTRIX LAT/Telnet Gateway Vulnerability
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- The Computer Emergency Response Team/Coordination Center (CERT/CC) has
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- received information concerning a vulnerability in LAT/Telnet gateway
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- software in Digital Equipment Corporation's (DEC) ULTRIX versions 4.1
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- and 4.2 on all architectures. Information regarding the exploitation
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- of this vulnerability has been publically disclosed so we recommend
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- taking immediate action. Until you are able to apply the patch we
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- recommend that sites disable the LAT/telnet service.
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- DEC has made a patch available which consists of new /usr/ucb/telnet
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- binaries.
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- The patch is available through DEC's Customer Support Centers. Sites
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- within the USA should call 1-800-525-7100. Sites in Europe and elsewhere
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- should contact DEC through their normal channels.
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- I. DESCRIPTION:
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- A vulnerability exists such that ULTRIX 4.1 and 4.2 systems
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- running the LAT/Telnet gateway software can allow unauthorized
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- privileged access. Although you may not be running the LAT/Telnet
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- service at this time, the CERT/CC urges all sites to install
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- the patch. This will ease any future installation of the
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- gateway software.
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- The LAT/Telnet software requires special installation and is
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- NOT part of the default ULTRIX configuration.
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- II. IMPACT:
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- Anyone who can access a terminal or modem connected to
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- the LAT server running the LAT/Telnet service can gain
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- unauthorized root privileges.
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- III. SOLUTION:
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- Obtain the appropriate version of the patch kit for your
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- system architecture from your DEC Customer Support Center,
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- and install according to the accompanying instructions.
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- The CERT/CC would like to thank George Michaelson of The Prentice Centre,
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- University of Queensland, Australia and John Annen of Davidson College for
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- bringing this to our attention. We would also like to thank DEC for their
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- response to this vulnerability and CIAC for their assistance.
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- If you believe that your system has been compromised, contact CERT/CC via
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- telephone or e-mail.
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- Computer Emergency Response Team/Coordination Center (CERT/CC)
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- Software Engineering Institute
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- Carnegie Mellon University
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- Pittsburgh, PA 15213-3890
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- Internet E-mail: cert@cert.sei.cmu.edu
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- Telephone: 412-268-7090 24-hour hotline:
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- CERT/CC personnel answer 7:30a.m.-6:00p.m. EST,
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- on call for emergencies during other hours.
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- Past advisories and other computer security related information are available
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- for anonymous ftp from the cert.sei.cmu.edu (192.88.209.5) system.
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