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F5 Networks BIG-IP : NTP vulnerabilities (K55376430)

high Nessus Plugin ID 145255

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Synopsis

The remote device is missing a vendor-supplied security patch.

Description

The version of F5 Networks BIG-IP installed on the remote host is prior to 11.6.5.3 / 12.1.5.3 / 13.1.3.6 / 14.1.4 / 15.1.2.1 / 16.0.1.1 / 16.1.0. It is, therefore, affected by a vulnerability as referenced in the K55376430 advisory.

 Thentpdin the network time protocol (NTP) before 4.2.8p14, and in 4.3.x before 4.3.100, allows remote attackers to cause a denial-of-service (DoS), either daemon exit or system time change, by predicting transmit timestamps for use in spoofed packets. The victim must be relying on unauthenticated IPv4 time sources. There must be an off-path attacker who can query time from the victim'sntpdinstance.(CVE-2020-13817)ImpactAn attacker who can send a large number of packets with the spoofed IPv4 address of the upstream server can use this flaw to modify the victim's clock by a limited amount or causentpdto exit.BIG-IPYour BIG-IP system is affected only when you configure it as an NTP server, and sources for the BIG-IP system's time are unreliable, unauthenticated, upstream NTP servers.BIG-IQThe BIG-IQ system is not directly affected by this vulnerability, but it inherits the vulnerability from the BIG-IP system.

Tenable has extracted the preceding description block directly from the F5 Networks BIG-IP security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to one of the non-vulnerable versions listed in the F5 Solution K55376430.

See Also

https://my.f5.com/manage/s/article/K55376430

Plugin Details

Severity: High

ID: 145255

File Name: f5_bigip_SOL55376430.nasl

Version: 1.10

Type: Local

Published: 1/22/2021

Updated: 4/22/2026

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 4.3

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

CVSS Score Source: CVE-2020-13817

CVSS v3

Risk Factor: High

Base Score: 7.4

Temporal Score: 6.4

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

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

Vulnerability Information

CPE: cpe:/a:f5:big-ip_link_controller, cpe:/a:f5:big-ip_application_visibility_and_reporting, cpe:/a:f5:big-ip_domain_name_system, cpe:/a:f5:big-ip_policy_enforcement_manager, cpe:/h:f5:big-ip, cpe:/a:f5:big-ip_application_security_manager, cpe:/a:f5:big-ip_advanced_firewall_manager, cpe:/a:f5:big-ip_local_traffic_manager, cpe:/a:f5:big-ip_access_policy_manager, cpe:/a:f5:big-ip_global_traffic_manager, cpe:/a:f5:big-ip_application_acceleration_manager

Required KB Items: Host/local_checks_enabled, Host/BIG-IP/hotfix, Host/BIG-IP/modules, Host/BIG-IP/version, Settings/ParanoidReport

Exploit Ease: No known exploits are available

Patch Publication Date: 9/8/2020

Vulnerability Publication Date: 6/4/2020

Reference Information

CVE: CVE-2020-13817