CERT Advisory 028

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CERT Advisory

 · 4 years ago

  

 
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CA-91:11                        CERT Advisory 
                               August 14, 1991 
                  ULTRIX LAT/Telnet Gateway Vulnerability 

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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. 

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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. 

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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. 
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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.org 
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.org (192.88.209.5) system. 

 
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