GLSA-201401-08 : NTP: Traffic amplification

This script is Copyright (C) 2014-2015 Tenable Network Security, Inc.

Synopsis :

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

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
to the default restriction which disallows anyone
to query the ntpd status, including &ldquo
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 :

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
CVSS Temporal Score : 4.1
Public Exploit Available : true

Family: Gentoo Local Security Checks

Nessus Plugin ID: 72016 ()

Bugtraq ID:

CVE ID: CVE-2013-5211

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