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Gentoo Linux Security Advisory GLSA 200704-11
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http://security.gentoo.org/
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Severity: Low
Title: Vixie Cron: Denial of Service
Date: April 16, 2007
Bugs: #164466
ID: 200704-11
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Synopsis
=======
The Gentoo implementation of Vixie Cron is vulnerable to a local Denial
of Service.
Background
=========
Vixie Cron is a command scheduler with extended syntax over cron.
Affected packages
================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 sys-process/vixie-cron < 4.1-r10 >= 4.1-r10
Description
==========
During an internal audit, Raphael Marichez of the Gentoo Linux Security
Team found that Vixie Cron has weak permissions set on Gentoo, allowing
for a local user to create hard links to system and users cron files,
while a st_nlink check in database.c will generate a superfluous error.
Impact
=====
Depending on the partitioning scheme and the "cron" group membership, a
malicious local user can create hard links to system or users cron
files that will trigger the st_link safety check and prevent the
targeted cron file from being run from the next restart or database
reload.
Workaround
=========
There is no known workaround at this time.
Resolution
=========
All Vixie Cron users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-process/vixie-cron-4.1-r10"
References
=========
[ 1 ] CVE-2007-1856
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1856
Availability
===========
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
http://security.gentoo.org/glsa/glsa-200704-11.xml
Concerns?
========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.
License
======
Copyright 2007 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).
The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.
http://creativecommons.org/licenses/by-sa/2.5
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