[gentoo-announce] [ GLSA 201001-01 ] NTP: Denial of Service

[news 28]

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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 ( -at -) 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