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CA-92:09

Last Revised:  September 19,1997

                Attached copyright statement





                                CERT Advisory

                               April 27, 1992

                       AIX Anonymous FTP Vulnerability



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

received information concerning a vulnerability in the anonymous FTP

configuration in all versions of AIX.



IBM is aware of this problem and a fix is available as apar number

"ix23944".  This patch is available for all AIX releases from "GOLD".



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.  The fix will appear in the upcoming 2009 

update and the next release of AIX.



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I.   Description



     Previous versions of the anonymous FTP installation script,

     /usr/lpp/tcpip/samples/anon.ftp, incorrectly configured various files

     and directories.

     



II.  Impact



     Remote users can execute unauthorized commands and gain access to the

     system if anonymous FTP has been installed.





III. Solution



     A.  Obtain the fix from IBM Support.  The fix contains three

         files: a "readme" file (README.a23944), the fix installation

         script (install.a23944), and an archive containing the updated

         files (PATCH.a23944.Z).



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



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The CERT/CC would like to thank Charles McGuire of the Computer Science

Department, the University of Montana for bringing this security

vulnerability to our attention and IBM for their response to the problem.

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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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Copyright 1992 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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