Articles / Red Hat: Updated utempter p…

Red Hat: Updated utempter package fixes vulnerability

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. Updated packages are available from updates.redhat.com.
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                   Red Hat Security Advisory

Synopsis:          Updated utempter package fixes vulnerability
Advisory ID:       RHSA-2004:174-01
Issue date:        2004-05-26
Updated on:        2004-05-26
Product:           Red Hat Enterprise Linux
Keywords:          
Cross references:  
Obsoletes:         
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. Relevant releases/architectures:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1 - i386, ia64
Red Hat Linux Advanced Workstation 2.1 - ia64
Red Hat Enterprise Linux ES version 2.1 - i386
Red Hat Enterprise Linux WS version 2.1 - i386
Red Hat Enterprise Linux AS version 3 - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Desktop version 3 - i386, x86_64
Red Hat Enterprise Linux ES version 3 - i386, ia64, x86_64
Red Hat Enterprise Linux WS version 3 - i386, ia64, x86_64

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.

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 Red Hat Network.  Many
people find this an easier way to apply updates.  To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

If up2date fails to connect to Red Hat Network due to SSL
Certificate Errors, you need to install a version of the
up2date client with an updated certificate.  The latest version of
up2date is available from the Red Hat FTP site and may also be
downloaded directly from the RHN website:

https://rhn.redhat.com/help/latest-up2date.pxt

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

121332 - CAN-2004-0233 utempter directory traversal symlink attack

6. RPMs required:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/utempter-0.5.5-1.2.1EL.0.src.rpm

i386:
Available from Red Hat Network: utempter-0.5.5-1.2.1EL.0.i386.rpm

ia64:
Available from Red Hat Network: utempter-0.5.5-1.2.1EL.0.ia64.rpm

Red Hat Linux Advanced Workstation 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/utempter-0.5.5-1.2.1EL.0.src.rpm

ia64:
Available from Red Hat Network: utempter-0.5.5-1.2.1EL.0.ia64.rpm

Red Hat Enterprise Linux ES version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1ES/en/os/SRPMS/utempter-0.5.5-1.2.1EL.0.src.rpm

i386:
Available from Red Hat Network: utempter-0.5.5-1.2.1EL.0.i386.rpm

Red Hat Enterprise Linux WS version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1WS/en/os/SRPMS/utempter-0.5.5-1.2.1EL.0.src.rpm

i386:
Available from Red Hat Network: utempter-0.5.5-1.2.1EL.0.i386.rpm

Red Hat Enterprise Linux AS version 3:

SRPMS:
ftp://updates.redhat.com/enterprise/3AS/en/os/SRPMS/utempter-0.5.5-1.3EL.0.src.rpm

i386:
Available from Red Hat Network: utempter-0.5.5-1.3EL.0.i386.rpm

ia64:
Available from Red Hat Network: utempter-0.5.5-1.3EL.0.ia64.rpm

ppc:
Available from Red Hat Network: utempter-0.5.5-1.3EL.0.ppc.rpm

s390:
Available from Red Hat Network: utempter-0.5.5-1.3EL.0.s390.rpm

s390x:
Available from Red Hat Network: utempter-0.5.5-1.3EL.0.s390x.rpm

x86_64:
Available from Red Hat Network: utempter-0.5.5-1.3EL.0.x86_64.rpm

Red Hat Desktop version 3:

SRPMS:
ftp://updates.redhat.com/enterprise/3desktop/en/os/SRPMS/utempter-0.5.5-1.3EL.0.src.rpm

i386:
Available from Red Hat Network: utempter-0.5.5-1.3EL.0.i386.rpm

x86_64:
Available from Red Hat Network: utempter-0.5.5-1.3EL.0.x86_64.rpm

Red Hat Enterprise Linux ES version 3:

SRPMS:
ftp://updates.redhat.com/enterprise/3ES/en/os/SRPMS/utempter-0.5.5-1.3EL.0.src.rpm

i386:
Available from Red Hat Network: utempter-0.5.5-1.3EL.0.i386.rpm

ia64:
Available from Red Hat Network: utempter-0.5.5-1.3EL.0.ia64.rpm

x86_64:
Available from Red Hat Network: utempter-0.5.5-1.3EL.0.x86_64.rpm

Red Hat Enterprise Linux WS version 3:

SRPMS:
ftp://updates.redhat.com/enterprise/3WS/en/os/SRPMS/utempter-0.5.5-1.3EL.0.src.rpm

i386:
Available from Red Hat Network: utempter-0.5.5-1.3EL.0.i386.rpm

ia64:
Available from Red Hat Network: utempter-0.5.5-1.3EL.0.ia64.rpm

x86_64:
Available from Red Hat Network: utempter-0.5.5-1.3EL.0.x86_64.rpm



7. Verification:

MD5 sum                          Package Name
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417fb9a00960adc60d2480e76a1432e9 utempter-0.5.5-1.2.1EL.0.i386.rpm
36023598fdb8c619e3a7ddf3071eeda8 utempter-0.5.5-1.2.1EL.0.ia64.rpm
bfcd383f81642909da3b591dc501ea26 utempter-0.5.5-1.2.1EL.0.src.rpm
437cbd0cf70f4c106d8769022818046e utempter-0.5.5-1.3EL.0.i386.rpm
78a2997b4bfa09e8797aa8168db5ee99 utempter-0.5.5-1.3EL.0.ia64.rpm
fa912c642528d6d1785245c0bed610a3 utempter-0.5.5-1.3EL.0.ppc.rpm
d6bd211838e75ae01eed0ad10f638fae utempter-0.5.5-1.3EL.0.s390.rpm
95518a64083b9610d6d13d01991296cf utempter-0.5.5-1.3EL.0.s390x.rpm
bb78ec4f0201e337eca2a0da85d5aa3d utempter-0.5.5-1.3EL.0.src.rpm
39e382c6a8e6a1ec5e05c5ba9bad4ee8 utempter-0.5.5-1.3EL.0.x86_64.rpm


These packages are GPG signed by Red Hat for security.  Our key is
available from https://www.redhat.com/security/team/key.html

You can verify each package with the following command:

    rpm --checksig -v 

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:

    md5sum 


8. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0233

9. Contact:

The Red Hat security contact is .  More contact
details at https://www.redhat.com/security/team/contact.html

Copyright 2004 Red Hat, Inc.
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