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Gentoo Linux Security Advisory                           GLSA 200411-27
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Fcron: Multiple vulnerabilities
      Date: November 18, 2004
      Bugs: #71311
        ID: 200411-27

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Synopsis
========

Multiple vulnerabilities in Fcron can allow a local user to potentially
cause a Denial of Service.

Background
==========

Fcron is a command scheduler with extended capabilities over cron and
anacron.

Affected packages
=================

    -------------------------------------------------------------------
     Package         /  Vulnerable  /                       Unaffected
    -------------------------------------------------------------------
  1  sys-apps/fcron      <= 2.9.5                            *>= 2.0.2
                                                            >= 2.9.5.1

Description
===========

Due to design errors in the fcronsighup program, Fcron may allow a
local user to bypass access restrictions (CAN-2004-1031), view the
contents of root owned files (CAN-2004-1030), remove arbitrary files or
create empty files (CAN-2004-1032), and send a SIGHUP to any process. A
vulnerability also exists in fcrontab which may allow local users to
view the contents of fcron.allow and fcron.deny (CAN-2004-1033).

Impact
======

A local attacker could exploit these vulnerabilities to perform a
Denial of Service on the system running Fcron.

Workaround
==========

Make sure the fcronsighup and fcrontab binaries are only executable by
trusted users.

Resolution
==========

All Fcron users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose
 &quot;&gt;=sys-apps/fcron-2.0.2&quot;

References
==========

  [ 1 ] CAN-2004-1030
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1030
  [ 2 ] CAN-2004-1031
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1031
  [ 3 ] CAN-2004-1032
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1032
  [ 4 ] CAN-2004-1033
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1033

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  http://security.gentoo.org/glsa/glsa-200411-27.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 2004 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/2.0