Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2001.075 -- RHSA-2001:014-03
New vixie-cron packages available
20 February 2001
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: crontab
Vendor: Red Hat
Operating System: Red Hat Linux 5.2
Red Hat Linux 6.2
Red Hat Linux 7.0
Platform: Alpha
i386
Sparc
Impact: Increased Privileges
Access Required: Existing Account
- --------------------------BEGIN INCLUDED TEXT--------------------
- ---------------------------------------------------------------------
Red Hat, Inc. Red Hat Security Advisory
Synopsis: New vixie-cron packages available
Advisory ID: RHSA-2001:014-03
Issue date: 2001-02-12
Updated on: 2001-02-19
Product: Red Hat Linux
Keywords: vixie-cron buffer overflow username crontab
Cross references:
Obsoletes:
- ---------------------------------------------------------------------
1. Topic:
New vixie-cron packages are available that fix a buffer overflow
in the 'crontab' command; this could allow certain users to
gain elevated privileges.
It is recommended that all users update to the fixed packages.
Users of Red Hat Linux 6.0 or 6.1 should use the packages for
Red Hat Linux 6.2.
2. Relevant releases/architectures:
Red Hat Linux 5.2 - alpha, i386, sparc
Red Hat Linux 6.2 - alpha, i386, sparc
Red Hat Linux 7.0 - alpha, i386
3. Problem description:
A buffer overflow existed in the 'crontab' command; if called
by a user with a username longer than 20 characters. If the
system administrator has created usernames of that length, it
would be possible for those users to gain elevated privileges.
4. Solution:
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 directly *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.
5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):
6. RPMs required:
Red Hat Linux 5.2:
SRPMS:
ftp://updates.redhat.com/5.2/SRPMS/vixie-cron-3.0.1-38.5.2.src.rpm
alpha:
ftp://updates.redhat.com/5.2/alpha/vixie-cron-3.0.1-38.5.2.alpha.rpm
i386:
ftp://updates.redhat.com/5.2/i386/vixie-cron-3.0.1-38.5.2.i386.rpm
sparc:
ftp://updates.redhat.com/5.2/sparc/vixie-cron-3.0.1-38.5.2.sparc.rpm
Red Hat Linux 6.2:
SRPMS:
ftp://updates.redhat.com/6.2/SRPMS/vixie-cron-3.0.1-40.1.src.rpm
alpha:
ftp://updates.redhat.com/6.2/alpha/vixie-cron-3.0.1-40.1.alpha.rpm
i386:
ftp://updates.redhat.com/6.2/i386/vixie-cron-3.0.1-40.1.i386.rpm
sparc:
ftp://updates.redhat.com/6.2/sparc/vixie-cron-3.0.1-40.1.sparc.rpm
Red Hat Linux 7.0:
SRPMS:
ftp://updates.redhat.com/7.0/SRPMS/vixie-cron-3.0.1-61.src.rpm
alpha:
ftp://updates.redhat.com/7.0/alpha/vixie-cron-3.0.1-61.alpha.rpm
i386:
ftp://updates.redhat.com/7.0/i386/vixie-cron-3.0.1-61.i386.rpm
7. Verification:
MD5 sum Package Name
- --------------------------------------------------------------------------
3a89bffb76e4f6aa4b2f2642ba043bc7 5.2/SRPMS/vixie-cron-3.0.1-38.5.2.src.rpm
4ba62d6f55d8bbeb47e57b0a9464701b 5.2/alpha/vixie-cron-3.0.1-38.5.2.alpha.rpm
5827b0be32d899fdad229e225cbd4782 5.2/i386/vixie-cron-3.0.1-38.5.2.i386.rpm
73906a21d198cbf255c724fab8de9a21 5.2/sparc/vixie-cron-3.0.1-38.5.2.sparc.rpm
e037d33b2c605b054308b543613c9b52 6.2/SRPMS/vixie-cron-3.0.1-40.1.src.rpm
e0ab2bc7b094d65971a3acae39379e20 6.2/alpha/vixie-cron-3.0.1-40.1.alpha.rpm
12d0cc89ca909ac56774e136af0442b5 6.2/i386/vixie-cron-3.0.1-40.1.i386.rpm
4b9249539b22b0671577d738b64c4d58 6.2/sparc/vixie-cron-3.0.1-40.1.sparc.rpm
16fbd0ee65609ab35c96699089604870 7.0/SRPMS/vixie-cron-3.0.1-61.src.rpm
b0cfceed1c6d1df1229f434d7adec14d 7.0/alpha/vixie-cron-3.0.1-61.alpha.rpm
13707ef913e7801da32f9d47a419f81b 7.0/i386/vixie-cron-3.0.1-61.i386.rpm
These packages are GPG signed by Red Hat, Inc. for security. Our key
is available at:
http://www.redhat.com/corp/contact.html
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, 2001 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:
http://www.auscert.org.au/Information/advisories.html
If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security
Teams).
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.
-----BEGIN PGP SIGNATURE-----
Version: 2.6.3i
Charset: noconv
Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key
iQCVAwUBOpI6lSh9+71yA2DNAQGGhAP/UGrtMQnuz3nPZ484kd4hjZEQrCEdSFPk
ncLKOEZJpHpJD0YG5D7TA4JJ4zII+F21k0p/Plo8RgIKu2FSgJE9j7EYDEZiFVuz
5vyJlUI0DuJxJp7Wdxp4mlzjLLNpj+fqaorg+i8ZQfHVQXXV7pk4B0e2zHAIhvsX
G9+g8ajTICg=
=8EVj
-----END PGP SIGNATURE-----