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Fedora Legacy Update Advisory
Synopsis: Updated utempter resolves security vulnerability
Advisory ID: FLSA:1546
Issue date: 2004-05-18
Product: Red Hat Linux
Keywords: Security
Cross references: https://bugzilla.fedora.us/show_bug.cgi?id=1546
CVE Names: CAN-2004-0233
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1. Topic:
An updated utempter package that fixes a potential symlink vulnerability is
now available.
2. Relevent releases/architectures:
Red Hat Linux 7.2 - i386
Red Hat Linux 7.3 - i386
Red Hat Linux 8.0 - i386
3. Problem description:
Utempter is a utility that allows terminal applications such as xterm and
screen to update utmp and wtmp without requiring root privileges.
Steve Grubb discovered a flaw in Utempter which allowed device names
containing directory traversal sequences such as '/../'. In combination
with an application that trusts the utmp or wtmp files, this could allow a
local attacker the ability to overwrite privileged files using a symlink.
Users should upgrade to this new version of utempter, which fixes this
vulnerability.
Fedora Legacy would like to thank Barry K. Nathan for notification of this
issue.
4. Solution:
Before applying this update, make sure all previously released errata
relevant to your system have been applied.
To update all RPMs for your particular architecture, run:
rpm -Fvh [filenames]
where [filenames] is a list of the RPMs you wish to upgrade. Only those
RPMs which are currently installed will be updated. Those RPMs which are
not installed but included in the list will not be updated. Note that you
can also use wildcards (*.rpm) if your current directory *only* contains
the desired RPMs.
Please note that this update is also available via yum and apt. Many
people find this an easier way to apply updates. To use yum issue:
yum update
or to use apt:
apt-get update; apt-get upgrade
This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system. This assumes that you have yum or
apt-get configured for obtaining Fedora Legacy content. Please visit
http://www fedoralegacy.org/docs for directions on how to configure yum
and apt-get.
5. Bug IDs fixed:
http://bugzilla.fedora.us - 1546 - utempter symlink vulnerability
6. RPMs required:
Red Hat Linux 7.2:
SRPM:
http://download.fedoralegacy.org/redhat/7.2/updates/SRPMS/utempter-0.5.2-6.7.x.1.legacy.src.rpm
i386:
http://download.fedoralegacy.org/redhat/7.2/updates/i386/utempter-0.5.2-6.7.x.1.legacy.i386.rpm
Red Hat Linux 7.3:
SRPM:
http://download.fedoralegacy.org/redhat/7.3/updates/SRPMS/utempter-0.5.2-6.7.x.1.legacy.src.rpm
i386:
http://download.fedoralegacy.org/redhat/7.3/updates/i386/utempter-0.5.2-6.7.x.1.legacy.i386.rpm
Red Hat Linux 8.0:
SRPM:
http://download.fedoralegacy.org/redhat/8.0/updates/SRPMS/utempter-0.5.2-6.8.0.1.legacy.src.rpm
i386:
http://download.fedoralegacy.org/redhat/8.0/updates/i386/utempter-0.5.2-6.8.0.1.legacy.i386.rpm
7. Verification:
SHA1 sum Package Name
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739587d500bf401d83a5f2b01195ca8b5c81bed7
7.2/updates/SRPMS/utempter-0.5.2-6.7.x.1.legacy.src.rpm
021ec30fe6404f2eb74eee160a339fbd003c1b97
7.2/updates/i386/utempter-0.5.2-6.7.x.1.legacy.i386.rpm
739587d500bf401d83a5f2b01195ca8b5c81bed7
7.3/updates/SRPMS/utempter-0.5.2-6.7.x.1.legacy.src.rpm
021ec30fe6404f2eb74eee160a339fbd003c1b97
7.3/updates/i386/utempter-0.5.2-6.7.x.1.legacy.i386.rpm
2a3e5d030205551ffbf4460ff0dbabdac91e41d0
8.0/updates/SRPMS/utempter-0.5.2-6.8.0.1.legacy.src.rpm
1c6109fa9254052a2948e1999bab966ed86c68d1
8.0/updates/i386/utempter-0.5.2-6.8.0.1.legacy.i386.rpm
These packages are GPG signed by Fedora Legacy for security. Our key is
available from http://www.fedoralegacy.org/about/security.php
You can verify each package with the following command:
rpm --checksig -v <filename>
If you only wish to verify that each package has not been corrupted or
tampered with, examine only the sha1sum with the following command:
sha1sum <filename>
8. References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0233
https://rhn.redhat.com/errata/RHSA-2004-175.html
https://bugzilla.fedora.us/show_bug.cgi?id=1546
9. Contact:
The Fedora Legacy security contact is <secnotice at fedoralegacy.org>. More
project details at http://www.fedoralegacy.org
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Jesse Keating RHCE (http://geek.j2solutions.net)
Fedora Legacy Team (http://www.fedoralegacy.org)
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