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>>                                                      CERT-NL, 01-Mar-2000 <<
>> All CERT-NL information has been moved to http://cert.surfnet.nl.  Links  <<
>> to CERT-NL information contained in this advisory are therefore outdated. <<
>>                                                                           <<
>> CERT-NL also has stopped the CERT-CC-Mirror service.  Due to this the     <<
>> links to the CERT-CC mirror are obsolete. Visit the CERT-CC site for the  <<
>> complete CERT-CC advisory texts:                     http://www.cert.org  <<
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Security Advisory                                                       CERT-NL
===============================================================================
Author/Source : CERT-NL                                     Index  :    S-92-07
Distribution  : SURFnet Constituency                        Page   :          1
Classification: External                                    Version:      final
Subject       : AIX /bin/passw Vulnerability        Date   :  31-mar-92
===============================================================================

CERT-NL (SURFnet Computer Emergency Response Team) has received
information concerning a security problem in AIX/bin/passwd.

CERT-NL wishes to thank CERT/CC for bringing this to our attention.

===========================================================================
CA-92:07                        CERT Advisory
                               March 31, 1992
                        AIX /bin/passwd Vulnerability

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

The Computer Emergency Response Team/Coordination Center (CERT/CC) has
received information concerning a vulnerability with the passwd command
in AIX 3.2 and the 2007 update of AIX 3.1.

IBM is aware of this problem, and a fix is available as apar number
"ix23505".  Patches are available for AIX 3.2 and the 2007 update of 
AIX 3.1.

This fix may be ordered from Level 2 support or by anonymous ftp from 
software.watson.ibm.com (129.34.139.5) on the Internet.

     1. To order from IBM call 1-800-237-5511 and ask 
        that the fix be shipped.  Patches may be obtained
        outside the U.S. by contacting your local IBM
        representative.

     2. If you are on the Internet, use anonymous ftp to obtain 
        the fix from software.watson.ibm.com.

        Patch           Filename                Checksum
        AIX 3.2         pub/aix3/pas.32.tar.Z   54431  2262
        AIX 3.1 2007    pub/aix3/pas.31.tar.Z   06703    99

        Patches should be retrieved using binary mode.


IBM is currently incorporating the fix into the 3.2 version and 3.1
updates of AIX.  Future shipments of these products should not be 
vulnerable to this problem.  If you have any questions about products 
you receive, please contact your IBM representative.
- ---------------------------------------------------------------------------

I.   Description

     The passwd command contains a security vulnerability.

II.  Impact

     Local users can gain unauthorized root access.

III. Solution

     A.  As root, disable /bin/passwd until you obtain and install 
         the patch.

                # chmod 0500 /bin/passwd

     B.  Obtain the fix from IBM and install according to the
         directions provided with the patch.

- ---------------------------------------------------------------------------
The CERT/CC would like to thank Paul Selick of the University of Toronto
for bringing this security vulnerability to our attention.  We would also 
like to thank IBM for their quick response to this problem, and for making 
the patches available via anonymous ftp.
- ---------------------------------------------------------------------------

==============================================================================
CERT-NL is the Computer Emergency Response Team for SURFnet customers. SURFnet
is the Dutch network for educational, research and related institutes. CERT-NL
is a member of the Forum of Incident Response and Security Teams (FIRST).

All CERT-NL material is available under:
  http://cert.surfnet.nl/

In case of computer or network security problems please contact your local
CERT/security-team or CERT-NL  (if your institute is NOT a SURFnet customer
please address the appropriate (local) CERT/security-team).

CERT-NL is one/two hour(s) ahead of UTC (GMT) in winter/summer,
i.e. UTC+0100 in winter and UTC+0200 in summer (DST).

   Email:     cert-nl@surfnet.nl     ATTENDED REGULARLY ALL DAYS
   Phone:     +31 302 305 305        BUSINESS HOURS ONLY
   Fax:       +31 302 305 329        BUSINESS HOURS ONLY
   Snailmail: SURFnet bv
              Attn. CERT-NL
              P.O. Box 19035
              NL - 3501 DA  UTRECHT
              The Netherlands

NOODGEVALLEN:    06 22 92 35 64      ALTIJD BEREIKBAAR
EMERGENCIES : +31 6 22 92 35 64      ATTENDED AT ALL TIMES
CERT-NL'S EMERGENCY PHONENUMBER IS ONLY TO BE USED IN CASE OF EMERGENCIES:
THE SURFNET HELPDESK OPERATING THE EMERGENCY NUMBER HAS A *FIXED*
PROCEDURE FOR DEALING WITH YOUR ALERT AND WILL IN REGULAR CASES RELAY IT
TO CERT-NL IN AN APPROPRIATE MANNER. CERT-NL WILL THEN CONTACT YOU.
===============================================================================

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