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F5 Networks BIG-IP : BIND vulnerability (K19807532)

medium Nessus Plugin ID 139704

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Synopsis

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

Description

The asterisk character ('*') is allowed in DNS zone files, where it is most commonly present as a wildcard at a terminal node of the Domain Name System graph. However, the RFCs do not require and BIND does not enforce that an asterisk character be present only at a terminal node.

A problem can occur when an asterisk is present in an empty non-terminal location within the DNS graph. If such a node exists, after a series of queries, named can reach an inconsistent state that results in the failure of an assertion check in rbtdb.c, followed by the program exiting due to the assertion failure. (CVE-2020-8619)

Impact

You encounter this defect when you have both of the following conditions :

A nameserver provides authoritative service for one or more zones.

At least one zone contains an empty non-terminal entry containing an asterisk character.

A would-be attacker who is allowed to change zone content could, theoretically, introduce such a record in order to exploit this condition to cause denial-of-service (DoS);however, the use of this vector is unlikely because any such attack requires a significant privilege-level and iseasily traceable.

BIND versions from 9.11.14 through 9.11.19 are impacted.

Solution

Upgrade to one of the non-vulnerable versions listed in the F5 Solution K19807532.

See Also

https://my.f5.com/manage/s/article/K19807532

Plugin Details

Severity: Medium

ID: 139704

File Name: f5_bigip_SOL19807532.nasl

Version: 1.8

Type: local

Published: 8/20/2020

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

Temporal Score: 3

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

CVSS Score Source: CVE-2020-8619

CVSS v3

Risk Factor: Medium

Base Score: 4.9

Temporal Score: 4.3

Vector: CVSS:3.0/AV:N/AC:L/PR:H/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_access_policy_manager, cpe:/a:f5:big-ip_advanced_firewall_manager, cpe:/a:f5:big-ip_application_acceleration_manager, cpe:/a:f5:big-ip_application_security_manager, cpe:/a:f5:big-ip_application_visibility_and_reporting, cpe:/a:f5:big-ip_domain_name_system, cpe:/a:f5:big-ip_global_traffic_manager, cpe:/a:f5:big-ip_link_controller, cpe:/a:f5:big-ip_local_traffic_manager, cpe:/a:f5:big-ip_policy_enforcement_manager, cpe:/h:f5:big-ip

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: 6/18/2020

Vulnerability Publication Date: 6/17/2020

Reference Information

CVE: CVE-2020-8619