<?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>