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- ***********************************************************************
- DDN Security Bulletin 9111 DCA DDN Defense Communications System
- 15 Aug 91 Published by: DDN Security Coordination Center
- (SCC@NIC.DDN.MIL) (800) 235-3155
-
- DEFENSE DATA NETWORK
- SECURITY BULLETIN
-
- The DDN SECURITY BULLETIN is distributed by the DDN SCC (Security
- Coordination Center) under DCA contract as a means of communicating
- information on network and host security exposures, fixes, & concerns
- to security & management personnel at DDN facilities. Back issues may
- be obtained via FTP (or Kermit) from NIC.DDN.MIL [192.67.67.20]
- using login="anonymous" and password="guest". The bulletin pathname is
- SCC:DDN-SECURITY-yynn (where "yy" is the year the bulletin is issued
- and "nn" is a bulletin number, e.g. SCC:DDN-SECURITY-9001).
- **********************************************************************
-
- ULTRIX LAT/Telnet Gateway Vulnerability
-
- + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
- ! !
- ! The following important advisory was issued by the Computer !
- ! Emergency Response Team (CERT) and is being relayed unedited !
- ! via the Defense Communications Agency's Security Coordination !
- ! Center distribution system as a means of providing DDN !
- ! subscribers with useful security information. !
- ! !
- + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
-
- CA-91:11 CERT Advisory
- August 14, 1991
- ULTRIX LAT/Telnet Gateway Vulnerability
-
- ---------------------------------------------------------------------------
-
- The Computer Emergency Response Team/Coordination Center (CERT/CC) has
- received information concerning a vulnerability in LAT/Telnet gateway
- software in Digital Equipment Corporation's (DEC) ULTRIX versions 4.1
- and 4.2 on all architectures. Information regarding the exploitation
- of this vulnerability has been publicly disclosed so we recommend
- taking immediate action. Until you are able to apply the patch we
- recommend that sites disable the LAT/telnet service.
-
- DEC has made a patch available which consists of new /usr/ucb/telnet
- binaries.
-
- The patch is available through DEC's Customer Support Centers. Sites
- within the USA should call 1-800-525-7100. Sites in Europe and elsewhere
- should contact DEC through their normal channels.
-
- ---------------------------------------------------------------------------
-
- I. DESCRIPTION:
-
- A vulnerability exists such that ULTRIX 4.1 and 4.2 systems
- running the LAT/Telnet gateway software can allow unauthorized
- privileged access. Although you may not be running the LAT/Telnet
- service at this time, the CERT/CC urges all sites to install
- the patch. This will ease any future installation of the
- gateway software.
-
- The LAT/Telnet software requires special installation and is
- NOT part of the default ULTRIX configuration.
-
- II. IMPACT:
-
- Anyone who can access a terminal or modem connected to
- the LAT server running the LAT/Telnet service can gain
- unauthorized root privileges.
-
- III. SOLUTION:
-
- Obtain the appropriate version of the patch kit for your
- system architecture from your DEC Customer Support Center,
- and install according to the accompanying instructions.
-
- ---------------------------------------------------------------------------
- The CERT/CC would like to thank George Michaelson of The Prentice Centre,
- University of Queensland, Australia and John Annen of Davidson College for
- bringing this to our attention. We would also like to thank DEC for their
- response to this vulnerability and CIAC for their assistance.
- ---------------------------------------------------------------------------
-
- If you believe that your system has been compromised, contact CERT/CC via
- telephone or e-mail.
-
- Computer Emergency Response Team/Coordination Center (CERT/CC)
- Software Engineering Institute
- Carnegie Mellon University
- Pittsburgh, PA 15213-3890
-
- Internet E-mail: cert@cert.sei.cmu.edu
- Telephone: 412-268-7090 24-hour hotline:
- CERT/CC personnel answer 7:30a.m.-6:00p.m. EST,
- on call for emergencies during other hours.
-
- Past advisories and other computer security related information are available
- for anonymous ftp from the cert.sei.cmu.edu (192.88.209.5) system.
-
-