CERT Advisory 023

Published in

· 4 years ago

  

 
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CA-91:05                        CERT Advisory 
                                 May 1, 1991 
                           DEC Ultrix Vulnerability 

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The Computer Emergency Response Team/Coordination Center (CERT/CC) has 
received information concerning a vulnerability in Digital Equipment  
Corporation's (DEC) Ultrix operating system versions 4.0 and 4.1 for all 
DEC architectures.  The vulnerability has been fixed in version 4.2 which  
will be shipped beginning in late May.  DEC has also provided a suggested  
fix for versions 4.0 and 4.1. 
   
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I.   DESCRIPTION: 
     By default, /usr/bin/chroot is improperly installed in Ultrix  
     versions 4.0 and 4.1. 
      
II.  IMPACT: 
     System users can gain unauthorized privileges. 

III. SOLUTION: 
     Change the permission on the file /usr/bin/chroot. 

     # chmod 700 /usr/bin/chroot     

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Our thanks to Eric R. Jorgensen and Brian Ellis of UnixOps / Distributed  
Computing Services at the University of Colorado, Boulder, for bringing this  
problem to our attention.  The CERT/CC would also like to thank Digital for  
their response to this vulnerability. 
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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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