GLSA-201401-08 : NTP: Traffic amplification

This script is Copyright (C) 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-201401-08
(NTP: Traffic amplification)

ntpd is susceptible to a reflected Denial of Service attack. Please
review the CVE identifiers and references below for details.

Impact :

An unauthenticated remote attacker may conduct a distributed reflective
Denial of Service attack on another user via a vulnerable NTP server.

Workaround :

We modified the default ntp configuration in =net-misc/ntp-4.2.6_p5-r10
and added &ldquo
noquery&rdquo
to the default restriction which disallows anyone
to query the ntpd status, including &ldquo
monlist&rdquo
.
If you use a non-default configuration, and provide a ntp service to
untrusted networks, we highly recommend you to revise your configuration
to disable mode 6 and 7 queries for any untrusted (public) network.
You can always enable these queries for specific trusted networks. For
more details please see the &ldquo
Access Control Support&rdquo
chapter in the
ntp.conf(5) man page.

See also :

http://www.gentoo.org/security/en/glsa/glsa-201401-08.xml

Solution :

All NTP users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose '>=net-misc/ntp-4.2.6_p5-r10'
Note that the updated package contains a modified default configuration
only. You may need to modify your configuration further.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P)
Public Exploit Available : true

Family: Gentoo Local Security Checks

Nessus Plugin ID: 72016 ()

Bugtraq ID:

CVE ID: CVE-2013-5211