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[ GLSA 201001-01 ] NTP: Denial of Service
From: Stefan Behte <craig () gentoo org>
Date: Sun, 03 Jan 2010 17:29:56 +0100

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Gentoo Linux Security Advisory                           GLSA 201001-01
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: NTP: Denial of Service
      Date: January 03, 2010
      Bugs: #290881
        ID: 201001-01

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Synopsis
========

A Denial of Service condition in ntpd can cause excessive CPU or
bandwidth consumption.

Background
==========

NTP is a set of the Network Time Protocol programs.

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

    -------------------------------------------------------------------
     Package       /    Vulnerable    /                     Unaffected
    -------------------------------------------------------------------
  1  net-misc/ntp      < 4.2.4_p7-r1                    >= 4.2.4_p7-r1

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

Robin Park and Dmitri Vinokurov discovered that ntp_request.c in ntpd
does not handle MODE_PRIVATE packets correctly, causing a continuous
exchange of MODE_PRIVATE error responses between two NTP daemons or
causing high CPU load on a single host.

Impact
======

A remote, unauthenticated attacker could send a specially crafted
MODE_PRIVATE packet, allowing for a Denial of Service condition (CPU
and bandwidth consumption).

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All NTP users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-misc/ntp-4.2.4_p7-r1"

References
==========

  [ 1 ] CVE-2009-3563
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3563

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

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

  http://security.gentoo.org/glsa/glsa-201001-01.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
https://bugs.gentoo.org.

License
=======

Copyright 2010 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/2.5

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