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
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 “noquery” to the default restriction which disallows anyone
to query the ntpd status, including “monlist”.
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 “Access Control Support” chapter in the
ntp.conf(5) man page.

See also :

https://security.gentoo.org/glsa/201401-08

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)
CVSS Temporal Score : 4.1
(CVSS2#E:F/RL:OF/RC:ND)
Public Exploit Available : true

Family: Gentoo Local Security Checks

Nessus Plugin ID: 72016 ()

Bugtraq ID:

CVE ID: CVE-2013-5211

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