glsa-200704-11.xml


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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>April 16, 2007</announced>
  <revised>April 16, 2007: 01</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 &quot;&gt;=sys-process/vixie-cron-4.1-r10&quot;</code>
  </resolution>
  <references>
    <uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1856">CVE-2007-1856</uri>
  </references>
  <metadata tag="requester" timestamp="Fri, 13 Apr 2007 15:58:28 +0000">
    jaervosz
  </metadata>
  <metadata tag="submitter" timestamp="Fri, 13 Apr 2007 21:36:24 +0000">
    falco
  </metadata>
  <metadata tag="bugReady" timestamp="Mon, 16 Apr 2007 18:10:18 +0000">
    vorlon
  </metadata>
</glsa>