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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200704-11">
<title>Vixie Cron: Denial of service</title>
<synopsis>
The Gentoo implementation of Vixie Cron is vulnerable to a local Denial of
Service.
</synopsis>
<product type="ebuild">vixie-cron</product>
<announced>2007-04-16</announced>
<revised count="01">2007-04-16</revised>
<bug>164466</bug>
<access>local</access>
<affected>
<package name="sys-process/vixie-cron" auto="yes" arch="*">
<unaffected range="ge">4.1-r10</unaffected>
<vulnerable range="lt">4.1-r10</vulnerable>
</package>
</affected>
<background>
<p>
Vixie Cron is a command scheduler with extended syntax over cron.
</p>
</background>
<description>
<p>
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.
</p>
</description>
<impact type="low">
<p>
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.
</p>
</impact>
<workaround>
<p>
There is no known workaround at this time.
</p>
</workaround>
<resolution>
<p>
All Vixie Cron users should upgrade to the latest version:
</p>
<code>
# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-process/vixie-cron-4.1-r10"</code>
</resolution>
<references>
<uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1856">CVE-2007-1856</uri>
</references>
<metadata tag="requester" timestamp="2007-04-13T15:58:28Z">
jaervosz
</metadata>
<metadata tag="submitter" timestamp="2007-04-13T21:36:24Z">
falco
</metadata>
<metadata tag="bugReady" timestamp="2007-04-16T18:10:18Z">
vorlon
</metadata>
</glsa>
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