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F5 Networks BIG-IP : BIG-IP DNS virtual server vulnerability (K52035247)

high Nessus Plugin ID 144357

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Synopsis

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

Description

In a BIG-IP DNS / BIG-IP LTM GSLB deployment, under certain circumstances, the BIG-IP DNS system may stop using a BIG-IP LTM virtual server for DNS response.(CVE-2020-27721)

This can occur under the following conditions :

You configure connection rate limiting by either source ordestination addressfor aBIG-IPLTM virtual server.

The configured connection rate limit is exceededon the BIG-IP LTM virtual server (or Pool Member or Node), and the status of the virtual serveron the Configuration utilitybecomes yellow.

Impact

An attacker can exploit this vulnerability to cause theBIG-IP LTM virtual server to be marked as unavailable (yellow on the Configuration utility) resulting in a denial of DNS service (DoS) for all clients of the virtual server.

Solution

Upgrade to one of the non-vulnerable versions listed in the F5 Solution K52035247.

See Also

https://my.f5.com/manage/s/article/K52035247

Plugin Details

Severity: High

ID: 144357

File Name: f5_bigip_SOL52035247.nasl

Version: 1.9

Type: local

Published: 12/17/2020

Updated: 11/2/2023

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

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

CVSS Score Source: CVE-2020-27721

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:f5:big-ip_domain_name_system, cpe:/a:f5:big-ip_global_traffic_manager, cpe:/h:f5:big-ip

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

Exploit Ease: No known exploits are available

Patch Publication Date: 12/16/2020

Vulnerability Publication Date: 12/24/2020

Reference Information

CVE: CVE-2020-27721

IAVA: 2021-A-0004-S