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Home : Advisories : AIX /bin/passwd Vulnerability

Title: AIX /bin/passwd Vulnerability
Released by: CERT
Date: 31st March 1992
Printable version: Click here

Hash: SHA1



Last Revised:  September 19, 1997

                Attached copyright statement

                               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 ( 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


     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.

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

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 (

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

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.


Revision History:

September 19,1997  Attached Copyright Statement


Version: PGP for Personal Privacy 5.0

Charset: noconv





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