Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2004.0321 -- RHSA-2004:175-01
Updated utempter package fixes vulnerability
04 May 2004
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: utempter
Publisher: Red Hat
Operating System: Red Hat Linux 9
Linux
Impact: Overwrite Arbitrary Files
Access Required: Existing Account
CVE Names: CAN-2004-0233
- --------------------------BEGIN INCLUDED TEXT--------------------
- -----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
- - ---------------------------------------------------------------------
Red Hat Security Advisory
Synopsis: Updated utempter package fixes vulnerability
Advisory ID: RHSA-2004:175-01
Issue date: 2004-04-30
Updated on: 2004-04-30
Product: Red Hat Linux
Keywords:
Cross references:
Obsoletes:
CVE Names: CAN-2004-0233
- - ---------------------------------------------------------------------
1. Topic:
An updated utempter package that fixes a potential symlink vulnerability is
now available.
2. Relevant releases/architectures:
Red Hat Linux 9 - 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.
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. RPMs required:
Red Hat Linux 9:
SRPMS:
ftp://updates.redhat.com/9/en/os/SRPMS/utempter-0.5.5-2.RHL9.0.src.rpm
i386:
ftp://updates.redhat.com/9/en/os/i386/utempter-0.5.5-2.RHL9.0.i386.rpm
6. Verification:
MD5 sum Package Name
- - --------------------------------------------------------------------------
b7f13df830c3f64eef6c6895edfb3b1f 9/en/os/SRPMS/utempter-0.5.5-2.RHL9.0.src.rpm
b207cd5661c7d687c3503399ce3bb611 9/en/os/i386/utempter-0.5.5-2.RHL9.0.i386.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 <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:
md5sum <filename>
7. References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0233
8. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://www.redhat.com/security/team/contact.html
Copyright 2004 Red Hat, Inc.
- -----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.7 (GNU/Linux)
iD8DBQFAkqm4XlSAg2UNWIIRArJpAJ0Z9235SRT8xY4BfVKhgofHcXzU8QCguC0J
eg8ALhqscvYMWrlGVMnwtu8=
=JpOn
- -----END PGP SIGNATURE-----
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
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 follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
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 author's website 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:
http://www.auscert.org.au/render.html?cid=1980
If you believe that your computer system has been compromised or attacked in
any way, we encourage you to let us know by completing the secure National IT
Incident Reporting Form at:
http://www.auscert.org.au/render.html?it=3192
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 member emergencies only.
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
iQCVAwUBQJcUdyh9+71yA2DNAQKNIwP/e/QnPsoH/Q4AGJbd/94lnuyGXODh+8F6
q9YkZGCXAmUttfMasFRc1Je7uTASheYhBku5XAPsSZr890dG3fODWEurSNVFwF1n
0imnDzL2ZxYJaykaSm/4Tw4AWI/sqL1IXdXz+JI9uYcTzWN7s1shvIRpq0ZULGVT
Fm6KvfSnOM4=
=c9IR
-----END PGP SIGNATURE-----