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Security Bulletin 9213                  DISA Defense Communications System
April 27, 1992              Published by: DDN Security Coordination Center
                                     ([email protected])   1-(800) 365-3642

                       DEFENSE  DATA  NETWORK
                         SECURITY  BULLETIN

 The DDN SECURITY BULLETIN is distributed by the DDN SCC (Security
 Coordination Center) under DISA contract as a means of communicating
 information on network and host security exposures, fixes, and concerns
 to security and management personnel at DDN facilities.  Back issues may
 be obtained via FTP (or Kermit) from NIC.DDN.MIL [192.112.36.5]
 using login="anonymous" and password="guest".  The bulletin pathname is
 scc/ddn-security-yynn (where "yy" is the year the bulletin is issued
 and "nn" is a bulletin number, e.g. scc/ddn-security-9213).
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!                                                                       !
!     The following important  advisory was  issued by the Computer     !
!     Emergency Response Team (CERT)  and is being relayed unedited     !
!     via the Defense Information Systems Agency's Security             !
!     Coordination Center  distribution  system  as a  means  of        !
!     providing  DDN subscribers with useful security information.      !
!                                                                       !
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===========================================================================
CA-92:09                        CERT Advisory
                              April 27, 1992
                      AIX Anonymous FTP Vulnerability

---------------------------------------------------------------------------

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.
---------------------------------------------------------------------------

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: [email protected]
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.sei.cmu.edu (192.88.209.5).

Please note: cert.sei.cmu.edu is soon to become cert.org.

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