"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

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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