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CERT Advisory CA-94:03

Original issue date:   February 24, 1994

Last revised: September 19,1997

              Updated copyright statement



Topic: IBM AIX Performance Tools Vulnerabilities

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The CERT Coordination Center has received information concerning

vulnerabilities in the "bosext1.extcmds.obj" Licensed Program Product

(performance tools).  These problems exist on IBM AIX 3.2.4 systems that

have Program Temporary Fixes (PTFs) U420020 or U422510 installed and

on all AIX 3.2.5 systems.



CERT recommends that affected sites apply the workaround provided in

section III below.





I.      Description



        Vulnerabilities exist in the bosext1.extcmds.obj performance tools

        in AIX 3.2.5 and in those AIX 3.2.4 systems with Program Temporary

        Fixes (PTFs) U420020 or U422510 installed.  These problems do not

        exist in earlier versions of AIX.



II.     Impact



        Local users can gain unauthorized root access to the system.



III.    Workaround



        A. The recommended workaround is to change the permissions of

           all the programs in the /usr/lpp/bosperf directory structure

           so that the setuid bit is removed and the programs can be

           executed only by 'root'.  This can be accomplished as follows:



                % su root

                # chmod -R u-s,og= /usr/lpp/bosperf/*



           The programs affected by this workaround include:

                filemon, fileplace, genkex, genkld, genld, lvedit,

                netpmon, rmap, rmss, stripnm, svmon, tprof



           As a result of this workaround, these programs will no longer

           be executable by users other than 'root'.



        B. Patches for these problems can be ordered as Authorized

           Program Analysis Report (APAR) IX42332.



           To order an APAR from IBM call 1-800-237-5511 and ask for

           shipment as soon as it is available.  APARs may be obtained

           outside the U.S. by contacting your local IBM representative.



           Any further information that we receive on APAR IX42332 will

           be available by anonymous FTP in the file

           pub/cert_advisories/CA-94:03.README on info.cert.org.



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The CERT Coordination Center wishes to thank Jill K. Bowyer of USAF/DISA

for reporting this problem and IBM for their prompt 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 Forum of Incident

Response and Security Teams (FIRST).



Internet E-mail: cert@cert.org

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

           CERT personnel answer 8:30 a.m.-5:00 p.m. EST(GMT-5)/EDT(GMT-4),

           and are 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

on info.cert.org.





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Copyright 1994 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  Updated Copyright Statement



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