GLSA-201001-01 : NTP: Denial of Service

This script is Copyright (C) 2010-2014 Tenable Network Security, Inc.


Synopsis :

The remote Gentoo host is missing one or more security-related
patches.

Description :

The remote host is affected by the vulnerability described in GLSA-201001-01
(NTP: Denial of Service)

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.

See also :

http://www.gentoo.org/security/en/glsa/glsa-201001-01.xml

Solution :

All NTP users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose '>=net-misc/ntp-4.2.4_p7-r1'

Risk factor :

Medium / CVSS Base Score : 6.4
(CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:P)
CVSS Temporal Score : 5.6
(CVSS2#E:ND/RL:OF/RC:C)
Public Exploit Available : true

Family: Gentoo Local Security Checks

Nessus Plugin ID: 44890 (gentoo_GLSA-201001-01.nasl)

Bugtraq ID: 37255

CVE ID: CVE-2009-3563