Date: 06 Jun 1994 09:50:17 -0400
From: Pete Hammes <pch@assist.ims.disa.MIL>
Subject: ASSIST 94-20
To: assist-bulletin@assist.ims.disa.MIL

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<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>  
    
          Automated Systems Security Incident Support Team
                                                _____
             ___   ___  _____   ___  _____     |     /
      /\    /   \ /   \   |    /   \   |       |    / Integritas
     /  \   \___  \___    |    \___    |       |   <      et
    /____\      \     \   |        \   |       |    \ Celeritas
   /      \ \___/ \___/ __|__  \___/   |       |_____\
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>  
    
                       Bulletin  94-20
 
           Release date: 6 June 94, 09:30 AM EDT
 
SUBJECT: IBM AIX bsh Vulnerability.

SUMMARY: This bulletin contains information about a vulnerability in
the batch queue (bsh) of IBM AIX systems running versions prior to
and including AIX 3.2, and instructions for disabling the batch
queue and obtaining fixes developed by IBM.

BACKGROUND: The queueing system on IBM AIX includes a batch queue,
"bsh", which is turned on by default in /etc/qconfig on all versions
of AIX 3 and earlier.  

IMPACT: If network printing is used, users can gain access to a
privileged account. 

RECOMMENDED SOLUTION: In the next release of AIX, the bsh queue will
be turned off by default.  ASSIST recommends that the bsh queue is 
turned off using the workaround described in section A below unless
there is an explicit need to support this functionality for remote
hosts.  If this functionality must be supported, IBM provides an
emergency fix as outlined in sections B and C below.

   A. Instructions for disabling the bsh queue.
      Disable the bsh queue by executing one of the two following
      procedures:

      1. As root, from the command line, enter:
         chque -qbsh -a"up = FALSE"
        
      2. From SMIT, enter:
         - Spooler
         - Manage Local Printer Subsystem
         - Local Printer Queues
         - Change/Show Characteristics of a Queue
           select bsh
         - Activate the Queue
           select no

   B. Emergency fix for sites that must retain bsh queue functionality.

      Obtain and install the emergency fix for the version(s) of AIX
      used at your site.  Fixes for the various levels of AIX are
      available by anonymous FTP from software.watson.ibm.com.
      The files are located in /pub/aix/bshfix.tar.Z in compressed
      tar format.  Installation instructions are included in the README
      file.                        

      The directory /pub/aix contains the latest available emergency 
      fix for APAR IX44381.  As updates become available, any new
      versions will be placed in this directory with the name
      bshfix<#>.tar.Z with <#> being incremented for each update.  See
      the README.FIRST file in that directory for details.

      IBM may temporarily remove this emergency fix file from the FTP
      site without prior notice to make corrections if flaws are 
      reported.  Due to the changing nature of these files, no checksum
      information is available.

   C. Official fix

      The official fix for this problem can be ordered as APAR IX44381.
      To order APARs from IBM in the U.S., call 1-800-237-5511 and ask
      that it be shipped to you as soon as it is available.  To obtain
      APARS outside of the U.S., contact a local IBM representative.

ASSIST wishes to thank the CERT Coordination Center for information
contained in this bulletin. 

ASSIST is an element of the Defense Information Systems Agency 
(DISA), Center for Information Systems Security (CISS), that 
provides service to the entire DoD community.  If you are a 
constituent of the DoD and have any questions about ASSIST or
computer security issues, contact ASSIST using one of the methods
listed below.  If your organization/institution is non-DoD,
contact your Forum of Incident Response and Security Teams
(FIRST) representative.  You can obtain a list of FIRST member
organizations and their constituencies by sending email to
docserver@first.org with an empty "subject" line and a message body
containing the line "send first-contacts".

ASSIST INFORMATION RESOURCES: If you would like to be included  in
the distribution list for these bulletins, send your Milnet
(Internet) e-mail address to assist-request@assist.ims.disa.mil.
Back issues of ASSIST bulletins, and other security related  
information, are available from the ASSIST BBS at 703-756-7993/
1154 DSN 289, and through anonymous FTP from assist.ims.disa.mil
(IP address 137.130.234.30).  Note: assist.ims.disa.mil will only
accept anonymous FTP connections from Milnet addresses that are
registered with the NIC or DNS.
 
ASSIST contact information: 
PHONE: 800-357-4231 (or 703-756-7974 DSN 289), duty hours are 06:00
to 22:30 EDT Monday through Friday.  During off duty hours, weekends
and holidays, ASSIST can be reached via pager at 800-SKY-PAGE
(800-759-7243) PIN 2133937.  Your page will be answered within 30
minutes, however if a quicker response is required, prefix your
phone number with "999".  
ELECTRONIC MAIL: Send to assist@assist.ims.disa.mil. 
ASSIST BBS: Leave a message for the "sysop".
  
Privacy Enhanced Mail (PEM): ASSIST uses PEM, a public key   
encryption tool, to digitally sign all bulletins that are   
distributed through e-mail.  The section of seemingly random   
characters between the "BEGIN PRIVACY-ENHANCED MESSAGE" and   
"BEGIN ASSIST BULLETIN" contains machine-readable digital   
signature information generated by PEM, not corrupted data.  PEM
software for UNIX systems is available from Trusted Information
Systems (TIS) at no cost, and can be obtained via anonymous FTP
from ftp.tis.com (IP 192.94.214.96).  Note: The TIS software is
just one of several implementations of PEM currently available and
additional versions are likely to be offered from other
sources in the near future. 
  
Reference herein to any specific commercial products, process, or
service by trade name, trademark manufacturer, or otherwise, does
not constitute or imply its endorsement, recommendation, or
favoring by ASSIST.  The views and opinions of authors expressed
herein shall not be used for advertising or product endorsement
purposes. 

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