Network Time Protocol Daemon (ntpd) read_mru_list() Remote DoS

high Nessus Plugin ID 95389

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Synopsis

The remote NTP server is affected by a denial of service vulnerability.

Description

The remote NTP server is affected by a denial of service vulnerability due to improper validation of mrulist queries. An unauthenticated, remote attacker can exploit this, via a specially crafted NTP mrulist query packet, to terminate the ntpd process.

Note that the NTP server is reportedly affected by additional vulnerabilities as well; however, Nessus has not tested for these.

Solution

Upgrade to NTP version 4.2.8p9 or later.

Plugin Details

Severity: High

ID: 95389

File Name: ntp_cve-2016-7434.nasl

Version: 1.14

Type: remote

Family: Misc.

Published: 11/29/2016

Updated: 6/12/2020

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2016-7434

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:ntp:ntp

Required KB Items: NTP/Running

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 11/21/2016

Vulnerability Publication Date: 11/21/2016

Reference Information

CVE: CVE-2016-7434

BID: 94448

CERT: 633847

Detections

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