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h-64.sig.irix.login.lockout.parameter.txt

h-64.sig.irix.login.lockout.parameter.txt
Posted Sep 23, 1999

h-64.sig.irix.login.lockout.parameter.txt

systems | irix
SHA-256 | 9fad830f53b36efb2d2afc789eaf18e892b69ca42b29be5333e94f8103792701

h-64.sig.irix.login.lockout.parameter.txt

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-----BEGIN PGP SIGNED MESSAGE-----

__________________________________________________________

The U.S. Department of Energy
Computer Incident Advisory Capability
___ __ __ _ ___
/ | /_\ /
\___ __|__ / \ \___
__________________________________________________________

INFORMATION BULLETIN

SGI IRIX login LOCKOUT parameter Vulnerability

May 29, 1997 19:00 GMT Number H-64
______________________________________________________________________________
PROBLEM: A vulnerability has been identified in the login program when
the LOCKOUT parameter in /etc/default/login is set to a number
greater than zero.
PLATFORM: All SGI systems running IRIX 5.3 and 6.2. Other versions of
IRIX may also be vulnerable.
DAMAGE: This vulnerability may allow users to create arbitrary or
corrupt certain files on the system.
SOLUTION: Until patches are available, apply the workaround indicated
below.
______________________________________________________________________________
VULNERABILITY Exploit information involving this vulnerability has been made
ASSESSMENT: publicly available.
______________________________________________________________________________

[ Start AUSCERT Advisory ]

===========================================================================
AA-97.12 AUSCERT Advisory
SGI IRIX login LOCKOUT parameter Vulnerability
10 April 1997

Last Revised: --

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

AUSCERT has received information that a vulnerability exists in the login
program when the LOCKOUT parameter in /etc/default/login is set to a number
greater than zero. This vulnerability is known to be present in IRIX 5.3
and 6.2. Other versions of IRIX may also be vulnerable.

This vulnerability may allow users to create arbitrary or corrupt certain
files on the system.

Exploit information involving this vulnerability has been made publicly
available.

At this stage, AUSCERT is unaware of any official vendor patches. AUSCERT
recommends that sites apply the workaround given in Section 3 until vendor
patches are made available.

This advisory will be updated as more information becomes available.

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

1. Description

Under the IRIX operating system, there is a file /etc/default/login
which contains default security logging configuration options. If
the parameter LOCKOUT is included in this file, and is set to a value
greater than zero, it causes accounts to be locked after a specified
number of consecutive unsuccessful login attempts by the same user.

When LOCKOUT is enabled users may be able to create arbitrary or
corrupt certain files on the system, due to an inadequate check in
the login verification process.

Sites can determine if this functionality is enabled by using the
command:

% grep '^LOCKOUT' /etc/default/login
LOCKOUT=3

If the number on the same line as LOCKOUT is greater than zero the
vulnerability may be exploited.

Information involving this vulnerability has been made publicly
available.

Silicon Graphics Inc. has informed AUSCERT that they are investigating
this vulnerability.

2. Impact

Users may create arbitrary or corrupt certain files on the system.

3. Workarounds/Solution

AUSCERT recommends that sites prevent the exploitation of this
vulnerability by immediately applying the workaround given in Section
3.1.

Currently there are no vendor patches available that address this
vulnerability. AUSCERT recommends that official vendor patches be
installed when they are made available.

3.1 Disable the LOCKOUT parameter

To prevent the exploitation of the vulnerability described in this
advisory, AUSCERT recommends that the functionality provided with the
LOCKOUT parameter be disabled.

The LOCKOUT parameter can be disabled by editing /etc/default/login
and commenting out the line containing the LOCKOUT parameter. The
comment character for /etc/default/login is "#".

Note that after applying this workaround, accounts will not be
automatically locked using the LOCKOUT parameter functionality.


[ End AUSCERT Advisory ]
______________________________________________________________________________

CIAC wishes to acknowledge the contributions of AUSCERT, Silicon Graphics
Inc., and Alan J Rosenthal from The University of Toronto for the information
contained in this bulletin.
______________________________________________________________________________


CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding
member of FIRST, the Forum of Incident Response and Security Teams, a
global organization established to foster cooperation and coordination
among computer security teams worldwide.

CIAC services are available to DOE, DOE contractors, and the NIH. CIAC
can be contacted at:
Voice: +1 510-422-8193
FAX: +1 510-423-8002
STU-III: +1 510-423-2604
E-mail: ciac@llnl.gov

For emergencies and off-hour assistance, DOE, DOE contractor sites,
and the NIH may contact CIAC 24-hours a day. During off hours (5PM -
8AM PST), call the CIAC voice number 510-422-8193 and leave a message,
or call 800-759-7243 (800-SKY-PAGE) to send a Sky Page. CIAC has two
Sky Page PIN numbers, the primary PIN number, 8550070, is for the CIAC
duty person, and the secondary PIN number, 8550074 is for the CIAC
Project Leader.

Previous CIAC notices, anti-virus software, and other information are
available from the CIAC Computer Security Archive.

World Wide Web: http://ciac.llnl.gov/
Anonymous FTP: ciac.llnl.gov (128.115.19.53)
Modem access: +1 (510) 423-4753 (28.8K baud)
+1 (510) 423-3331 (28.8K baud)

CIAC has several self-subscribing mailing lists for electronic
publications:
1. CIAC-BULLETIN for Advisories, highest priority - time critical
information and Bulletins, important computer security information;
2. CIAC-NOTES for Notes, a collection of computer security articles;
3. SPI-ANNOUNCE for official news about Security Profile Inspector
(SPI) software updates, new features, distribution and
availability;
4. SPI-NOTES, for discussion of problems and solutions regarding the
use of SPI products.

Our mailing lists are managed by a public domain software package
called Majordomo, which ignores E-mail header subject lines. To
subscribe (add yourself) to one of our mailing lists, send the
following request as the E-mail message body, substituting
ciac-bulletin, ciac-notes, spi-announce OR spi-notes for list-name:

E-mail to ciac-listproc@llnl.gov or majordomo@tholia.llnl.gov:
subscribe list-name
e.g., subscribe ciac-notes

You will receive an acknowledgment email immediately with a confirmation
that you will need to mail back to the addresses above, as per the
instructions in the email. This is a partial protection to make sure
you are really the one who asked to be signed up for the list in question.

If you include the word 'help' in the body of an email to the above address,
it will also send back an information file on how to subscribe/unsubscribe,
get past issues of CIAC bulletins via email, etc.

PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
communities receive CIAC bulletins. If you are not part of these
communities, please contact your agency's response team to report
incidents. Your agency's team will coordinate with CIAC. The Forum of
Incident Response and Security Teams (FIRST) is a world-wide
organization. A list of FIRST member organizations and their
constituencies can be obtained via WWW at http://www.first.org/.

This document was prepared as an account of work sponsored by an
agency of the United States Government. Neither the United States
Government nor the University of California nor any of their
employees, makes any warranty, express or implied, or assumes any
legal liability or responsibility for the accuracy, completeness, or
usefulness of any information, apparatus, product, or process
disclosed, or represents that its use would not infringe privately
owned rights. Reference herein to any specific commercial products,
process, or service by trade name, trademark, manufacturer, or
otherwise, does not necessarily constitute or imply its endorsement,
recommendation or favoring by the United States Government or the
University of California. The views and opinions of authors expressed
herein do not necessarily state or reflect those of the United States
Government or the University of California, and shall not be used for
advertising or product endorsement purposes.

LAST 10 CIAC BULLETINS ISSUED (Previous bulletins available from CIAC)

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