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1992-05-26
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Security Bulletin 9214 DISA Defense Communications System
May 27, 1992 Published by: DDN Security Coordination Center
(SCC@NIC.DDN.MIL) 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-9214).
**************************************************************************
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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. !
! !
+ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
===========================================================================
CA-92:10 CERT Advisory
May 26, 1992
AIX crontab Vulnerability
---------------------------------------------------------------------------
The Computer Emergency Response Team/Coordination Center (CERT/CC) has
received information concerning a vulnerability in crontab(1) in version 3.2
of IBM's AIX operating system.
IBM is aware of this problem, and a fix is available as apar number "ix26997"
for AIX version 3.2. The version information for the patched /usr/bin/crontab
is shown in the following what(1) output:
% what /usr/bin/crontab
04 1.23 com/cmd/cntl/cron/crontab.c, cmdcntl, bos320, 9218320f 4/8/92 11:50:42
07 1.8 com/cmd/cntl/cron/permit.c, bos, bos320 4/25/91 17:16:59
11 1.15 com/cmd/cntl/cron/cronsub.c, bos, bos320 8/18/91 20:42:32
06 1.9 com/cmd/cntl/cron/funcs.c, bos, bos320 6/8/91 21:22:40
If your crontab contains modules older than the above output indicates, we
suggest that you install the fix.
---------------------------------------------------------------------------
I. Description
The distributed version of /usr/bin/crontab contains a security
vulnerability.
II. Impact
Local users can gain unauthorized root access to the system.
III. Solution
The CERT/CC suggests that sites install the fix that IBM has made
available. As an interim step, we suggests that sites prevent all
non-root users from running /usr/bin/crontab by removing (or renaming)
the /var/adm/cron/cron.allow and /var/adm/cron/cron.deny files.
- Obtain the fix from IBM Support.
1. To order from IBM call 1-800-237-5511 and ask
that the fix be shipped. Outside the U.S., patches
may be obtainedby contacting your local IBM
representative.
2. If you are on the Internet, use anonymous ftp to obtain
the fix from software.watson.ibm.com (129.34.139.5).
Patch Filename Checksum
AIX 3.2 pub/aix3/cronta.tar.Z 02324 154
You must use binary mode to retrieve the patch.
- Install the fix following the instructions in the README file.
---------------------------------------------------------------------------
The CERT/CC would like to thank Fuat Baran of Advanced Network & Services,
Inc., for bringing this security vulnerability to our attention and IBM for
their quick response to this 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: 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 (192.88.209.5).
****************************************************************************
* *
* The point of contact for MILNET security-related incidents is the *
* Security Coordination Center (SCC). *
* *
* E-mail address: SCC@NIC.DDN.MIL *
* *
* Telephone: 1-(800)-365-3642 *
* *
* NIC Help Desk personnel are available from 7:00 a.m.-7:00 p.m. EST, *
* Monday through Friday except on federal holidays. *
* *
****************************************************************************