F5 Networks BIG-IP : BIND vulnerability (K05544642)

Medium Nessus Plugin ID 137377

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VPR Score: 6.1

Synopsis

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

Description

Using a specially crafted message, an attacker may potentially cause a BIND server to reach an inconsistent state if the attacker knows (or successfully guesses) the name of a TSIG key used by the server. Since BIND, by default, configures a local session key even on servers whose configuration does not otherwise make use of it, almost all current BIND servers are vulnerable. In releases of BIND dating from March 2018 and after, an assertion check in tsig.c detects this inconsistent state and deliberately exits. Prior to the introduction of the check the server would continue operating in an inconsistent state, with potentially harmful results. (CVE-2020-8617)

Impact

An attacker can exploit this vulnerability to trigger an assertion failure, resulting in a denial of service to clients.

Solution

Upgrade to one of the non-vulnerable versions listed in the F5 Solution K05544642.

See Also

https://support.f5.com/csp/article/K05544642

Plugin Details

Severity: Medium

ID: 137377

File Name: f5_bigip_SOL05544642.nasl

Version: 1.8

Type: local

Published: 2020/06/12

Updated: 2020/08/13

Dependencies: 76940

Configuration: Enable paranoid mode

Risk Information

Risk Factor: Medium

VPR Score: 6.1

CVSS v2.0

Base Score: 5

Temporal Score: 3.9

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

Temporal Vector: CVSS2#E:POC/RL:OF/RC:C

CVSS v3.0

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: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_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 Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2020/05/20

Vulnerability Publication Date: 2020/05/19

Reference Information

CVE: CVE-2020-8617