Check Point Advisories

BusyBox Project BusyBox udhcp Option Out of Bounds Read (CVE-2018-20679)

Vulnerability
Protection

Check Point Reference:	CPAI-2019-0246
Date Published:	24 Feb 2019
Severity:	High
Last Updated:	Tuesday 05 March, 2019
Source:	Busybox
Industry Reference:	CVE-2018-20679
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	BusyBox Project BusyBox prior to 1.30.0
Vulnerability Description	An out-of-bounds read vulnerability has been reported in the udhcp module of BusyBox. This vulnerability is due to insufficient validation of the length of certain options in a DHCP packets. A remote attacker could exploit this vulnerability by sending maliciously crafted messages to a DHCP client, server, or relay host.

Protection Overview

This protection detects attempts to exploit this vulnerability.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R80 / R77 / R75

In the IPS tab, click Protections and find the BusyBox Project BusyBox udhcp Option Out of Bounds Read protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: DHCP Protection Violation.
Attack Information: BusyBox Project BusyBox udhcp Option Out of Bounds Read