Network Time Protocol Daemon (ntpd) 3.x / 4.x < 4.2.8p2 Multiple Vulnerabilities

high Nessus Plugin ID 83744

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Synopsis

The remote NTP server is affected by multiple vulnerabilities.

Description

The version of the remote NTP server is 3.x or 4.x prior to 4.2.8p2.
It is, therefore, affected by the following vulnerabilities :

- The symmetric-key feature in the receive() function requires a correct message authentication code (MAC) only if the MAC field has a nonzero length. A man-in-the-middle attacker can exploit this to spoof packets by omitting the MAC. (CVE-2015-1798)

- A flaw exists in the symmetric-key feature in the receive() function when handling a specially crafted packet sent to one of two hosts that are peering with each other. An attacker can exploit this to cause the next attempt by the servers to synchronize to fail.
(CVE-2015-1799)

- A flaw exists in util/ntp-keygen.c due to the way that the ntp-keygen utility generates MD5 symmetric keys on big-endian systems. A remote attacker can exploit this to more easily guess MD5 symmetric keys and thereby spoof an NTP server or client. (CVE-2015-3405)

Solution

Upgrade to NTP version 4.2.8p2 or later.

Plugin Details

Severity: High

ID: 83744

File Name: ntp_4_2_8p2.nasl

Version: 1.11

Type: remote

Family: Misc.

Published: 5/21/2015

Updated: 11/22/2019

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.8

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

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

CVSS Score Source: CVE-2015-3405

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:H/I:N/A:N

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

Vulnerability Information

CPE: cpe:/a:ntp:ntp

Required KB Items: Settings/ParanoidReport, NTP/Running

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/7/2015

Vulnerability Publication Date: 3/30/2015

Reference Information

CVE: CVE-2015-1798, CVE-2015-1799, CVE-2015-2781, CVE-2015-3405

BID: 73950, 73951, 74045

CERT: 374268

Detections

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