GLSA-201401-08 : NTP: Traffic amplification

medium Nessus Plugin ID 72016
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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.

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.

See Also

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

Plugin Details

Severity: Medium

ID: 72016

File Name: gentoo_GLSA-201401-08.nasl

Version: 1.10

Type: local

Published: 1/20/2014

Updated: 1/6/2021

Dependencies: ssh_get_info.nasl

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P

Temporal Vector: E:POC/RL:OF/RC:C

Vulnerability Information

CPE: p-cpe:/a:gentoo:linux:ntp, cpe:/o:gentoo:linux

Required KB Items: Host/local_checks_enabled, Host/Gentoo/release, Host/Gentoo/qpkg-list

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 1/16/2014

Reference Information

CVE: CVE-2013-5211

CERT: 348126

GLSA: 201401-08