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

Background
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NTP is a set of the Network Time Protocol programs.

Affected packages
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    -------------------------------------------------------------------
     Package       /    Vulnerable    /                     Unaffected
    -------------------------------------------------------------------
  1  net-misc/ntp      < 4.2.4_p7-r1                    >=3D 4.2.4_p7-r1

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

Workaround
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There is no known workaround at this time.

Resolution
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All NTP users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=3Dnet-misc/ntp-4.2.4_p7-r1"

References
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  [ 1 ] CVE-2009-3563
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2009-3563

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-201001-01.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
https://bugs.gentoo.org.

License
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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