[ GLSA 200411-27 ] Fcron: Multiple vulnerabilities

[Luke Macken]

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

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

Affected packages
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-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 sys-apps/fcron <=3D 2.9.5 *>=3D 2.0.2
>=3D 2.9.5.1

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

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

Resolution
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All Fcron users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose &quot;&gt;=3Dsys-apps/fcron-2.0.2&qu=
ot;

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

Availability
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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?
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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
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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

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