Red Hat Linux Security Advisory
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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. 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.

3. Bug IDs fixed: (see bugzilla for more information)

4. 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

5. RPMs required:

6. Solution:

To update all RPMs for your particular architecture, run:

rpm -Fvh

where 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.

7. Verification:

MD5 sum                           Package Name
-------------------------------------------------------------------------
3a89bffb76e4f6aa4b2f2642ba043bc7  5.2/en/os/SRPMS/vixie-cron-3.0.1-38.5.2.src.rpm
4ba62d6f55d8bbeb47e57b0a9464701b  5.2/en/os/alpha/vixie-cron-3.0.1-38.5.2.alpha.rpm
5827b0be32d899fdad229e225cbd4782  5.2/en/os/i386/vixie-cron-3.0.1-38.5.2.i386.rpm
73906a21d198cbf255c724fab8de9a21  5.2/en/os/sparc/vixie-cron-3.0.1-38.5.2.sparc.rpm
e037d33b2c605b054308b543613c9b52  6.2/en/os/SRPMS/vixie-cron-3.0.1-40.1.src.rpm
e0ab2bc7b094d65971a3acae39379e20  6.2/en/os/alpha/vixie-cron-3.0.1-40.1.alpha.rpm
12d0cc89ca909ac56774e136af0442b5  6.2/en/os/i386/vixie-cron-3.0.1-40.1.i386.rpm
4b9249539b22b0671577d738b64c4d58  6.2/en/os/sparc/vixie-cron-3.0.1-40.1.sparc.rpm
16fbd0ee65609ab35c96699089604870  7.0/en/os/SRPMS/vixie-cron-3.0.1-61.src.rpm
b0cfceed1c6d1df1229f434d7adec14d  7.0/en/os/alpha/vixie-cron-3.0.1-61.alpha.rpm
13707ef913e7801da32f9d47a419f81b  7.0/en/os/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/about/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

Note that you need RPM >= 3.0 to check GnuPG keys.

8. References: