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CA-93:04a

Last Revised: September 19,1997

                Attached copyright statement



                             CERT Advisory

                            February 18, 1993

      REVISION NOTICE: Commodore Amiga UNIX finger Vulnerability

                                   

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               *** THIS IS A REVISED CERT ADVISORY ***

               *** IT CONTAINS UPDATED INFORMATION ***



The CERT Coordination Center has received information concerning a

vulnerability in the "finger" program of Commodore Business Machine's

Amiga UNIX product.  The vulnerability affects Commodore Amiga UNIX

versions 1.1, 2.03, 2.1, 2.1p1, 2.1p2, and 2.1p2a.  Commodore is aware

of the vulnerability, and both a workaround and a patch are available.

Affected sites should apply either the workaround or the patch, and

directions are provided below. 



The Commodore contact e-mail address given in CERT Advisory CA-93:04

was incorrect.  This revised advisory provides the correct e-mail

address.  If you have any further questions, contact David Miller of

Commodore via e-mail at davidm@commodore.com.



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I.    Description



      The "finger" command in Amiga UNIX contains a security

      vulnerability.





II.   Impact



      Non-privileged users can gain unauthorized access to files.





III.  Solution



      Commodore has suggested a workaround and a patch, as follows:



      A. Workaround



         As root, modify the permission of the existing /usr/bin/finger

         to prevent misuse.



                # /bin/chmod 0755 /usr/bin/finger



      B. Patch



         As root, install the "pubsrc" package from the distribution tape. 



         In the file, "/usr/src/pub/cmd/finger/src/finger.c", add the line:



                setuid(getuid());



         immediately before the line reading:



                display_finger(finger_list);



         (Optionally) save a copy of the existing /usr/bin/finger and modify

         its permission to prevent misuse.



                # /bin/mv /usr/bin/finger /usr/bin/finger.orig

                # /bin/chmod 0755 /usr/bin/finger.orig



         In the directory, "/usr/src/pub/cmd/finger", issue the command:



                # cd /usr/src/pub/cmd/finger

                # make install



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The CERT Coordination Center wishes to thank Commodore Business

Machines for their response to this problem.

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If you believe that your system has been compromised, contact the CERT

Coordination Center or your representative in FIRST (Forum of Incident

Response and Security Teams).



Internet E-mail: cert@cert.org

Telephone: 412-268-7090 (24-hour hotline)

           CERT personnel answer 7:30 a.m.-6:00 p.m. EST(GMT-5)/EDT(GMT-4),

           on call for emergencies during other hours.



CERT Coordination Center

Software Engineering Institute

Carnegie Mellon University

Pittsburgh, PA 15213-3890



Past advisories, information about FIRST representatives, and other

information related to computer security are available for anonymous FTP

from cert.org (192.88.209.5).



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Copyright 1993 Carnegie Mellon University. Conditions for use, disclaimers,

and sponsorship information can be found in

http://www.cert.org/legal_stuff.html and http://ftp.cert.org/pub/legal_stuff .

If you do not have FTP or web access, send mail to cert@cert.org with

"copyright" in the subject line.



CERT is registered in the U.S. Patent and Trademark Office.



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 Revision History:



 September 19,1997  Attached Copyright Statement



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