ISC DHCP < 4.4.1 DoS

high Nessus Plugin ID 138525

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Synopsis

The DHCP server installed on the remote Linux host is affected by a denial of service vulnerability.

Description

The DHCP server version installed on the remote host is prior to 4.4.1. It is, therefore, vulnerable to a denial of service condition. There had existed in one of the ISC BIND libraries a bug in a function that was used by dhcpd when operating in DHCPv6 mode. There was also a bug in dhcpd relating to the use of this function per its documentation, but the bug in the library function prevented this from causing any harm. All releases of dhcpd from ISC contain copies of this, and other, BIND libraries in combinations that have been tested prior to release and are known to not present issues like this. Some third-party packagers of ISC software have modified the dhcpd source, BIND source, or version matchup in ways that create the crash potential. Based on reports available to ISC, the crash probability is large and no analysis has been done on how, or even if, the probability can be manipulated by an attacker. Affects: Builds of dhcpd versions prior to version 4.4.1 when using BIND versions 9.11.2 or later, or BIND versions with specific bug fixes backported to them. ISC does not have access to comprehensive version lists for all repackagings of dhcpd that are vulnerable. In particular, builds from other vendors may also be affected. Operators are advised to consult their vendor documentation.

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

Solution

Upgrade the affected DHCP server to version 4.4.1 or later.

Plugin Details

Severity: High

ID: 138525

File Name: isc_dhcp_cve-2019-6470.nasl

Version: 1.5

Type: local

Agent: unix

Family: Misc.

Published: 7/16/2020

Updated: 3/1/2024

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

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

CVSS Score Source: CVE-2019-6470

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:N/I:N/A:H

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

Vulnerability Information

CPE: cpe:/a:isc:dhcp, cpe:/a:isc:bind

Required KB Items: dhcp_server/type, dhcp_server/version

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 11/1/2019

Vulnerability Publication Date: 11/1/2019

Reference Information

CVE: CVE-2019-6470

IAVB: 2020-B-0036-S

Detections

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