Operating System:


13 August 2000

Protect yourself against future threats.


              AUSCERT External Security Bulletin Redistribution
                      ESB-2000.214 -- RHSA-2000:053-01
                          Updated usermode packages
                               14 August 2000


	AusCERT Security Bulletin Summary

Product:		usermode
Vendor:			Red Hat
Operating System:	Red Hat Linux  
Platform:               N/A

Impact:			Root Compromise
Access Required:	Local

- --------------------------BEGIN INCLUDED TEXT--------------------

- ---------------------------------------------------------------------
                   Red Hat, Inc. Security Advisory

Synopsis:          Updated usermode packages.
Advisory ID:       RHSA-2000:053-01
Issue date:        2000-08-11
Updated on:        2000-08-11
Product:           Red Hat Linux
Keywords:          usermode shutdown
Cross references:  N/A
- ---------------------------------------------------------------------

1. Topic:

Updated usermode packages are now available for Red Hat Linux 6.0, 6.1, and

2. Relevant releases/architectures:

Red Hat Linux 6.0 - i386, alpha, sparc
Red Hat Linux 6.1 - i386, alpha, sparc
Red Hat Linux 6.2 - i386, alpha, sparc
Red Hat Linux 6.2E - i386, alpha, sparc

3. Problem description:

The usermode package allows unprivileged users logged in at the system
console to run the halt, poweroff, reboot, and shutdown commands without
needing to know the superuser's password.  While being able to halt,
poweroff, and reboot is a desirable thing, an unprivileged user can also
bring the system to single-user mode by running "shutdown now" with no
additional flags.  This update removes the "shutdown" command from the list
of commands unprivileged users can run.

4. Solution:

For each RPM for your particular architecture, run:

rpm -Fvh [filename]

where filename is the name of the RPM.

5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):

13768 - Auth dialogs show "Picture of a key" text instead of graphic
13616 - Missing icon.
12433 - /usr/sbin/userhelper not stripped
11006 - kppp either doesn't display locally or remotely
9746 - Local user can go into single mode only with shutdown now...

6. RPMs required:

Red Hat Linux 6.0, 6.1, 6.2:





7. Verification:

MD5 sum                           Package Name
- --------------------------------------------------------------------------
24f2766589d1a16ebcda912067173396  6.2/SRPMS/usermode-1.28-2.src.rpm
94423f4138477d9d47a055ed3c4b3648  6.2/alpha/usermode-1.28-2.alpha.rpm
b8f16bb02c4355a86183e268bd57ac74  6.2/i386/usermode-1.28-2.i386.rpm
e1c2b7626a905f64b03f48127e742259  6.2/sparc/usermode-1.28-2.sparc.rpm

These packages are GPG signed by Red Hat, Inc. for security.  Our key
is available at:

You can verify each package with the following command:
    rpm --checksig  <filename>

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
    rpm --checksig --nogpg <filename>

8. References:


Copyright(c) 2000 Red Hat, Inc.

- --------------------------END INCLUDED TEXT--------------------

This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content.  The decision to use any or all of this information is
the responsibility of each user or organisation, and should be done so in
accordance with site policies and procedures.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the original authors to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:


If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security

Internet Email: auscert@auscert.org.au
Facsimile:	(07) 3365 7031
Telephone:	(07) 3365 4417 (International: +61 7 3365 4417)
		AusCERT personnel answer during Queensland business hours
		which are GMT+10:00 (AEST).
		On call after hours for emergencies.

Version: 2.6.3i
Charset: noconv
Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key