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CA-92:06                        CERT Advisory
                               March 19, 1992
                           AIX uucp Vulnerability

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The Computer Emergency Response Team/Coordination Center (CERT/CC) has
received information concerning a vulnerability with the UUCP software
in versions of AIX up to 2007.  The vulnerability does not exist in AIX 3.2.

IBM is aware of this problem, and a fix is available as apar number
"ix18516".  This patch is available for all AIX releases from GOLD to
2006.

The fix is in the 2007 update and 3.2 release of AIX.  IBM customers may
call IBM Support (800-237-5511) and ask that the fix be shipped to them.
Patches may be obtained outside the U.S. by contacting your local IBM
representative.

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I.   Description

     Previous versions, except AIX 3.2, of the UUCP software contained
     incorrectly configured versions of various files.


II.  Impact

     Local users can execute unauthorized commands and gain unauthorized
     root access.


III. Solution

     - If allowing users access to the uucp isn't necessary, disable it.

		% chmod 0100 /usr/bin/uucp

     - Obtain the fix from IBM Support.

     - Install the fix following the instructions in the README file.

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The CERT/CC would like to thank Steve Knodle, Clarkson University, for
bringing this security vulnerability to our attention.
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If you believe that your system has been compromised, contact CERT/CC 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/CC personnel answer 7:30 a.m.-6:00 p.m. EST(GMT-5)/EDT(GMT-4),
           on call for emergencies during other hours.

Computer Emergency Response Team/Coordination Center (CERT/CC)
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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