Check Point Advisories

PHP phar_parse_tarfile method Integer Overflow (CVE-2015-4021)

Vulnerability
Protection

Check Point Reference:	CPAI-2015-0869
Date Published:	20 Jul 2015
Severity:	High
Last Updated:	Sunday 14 February, 2016
Source:	PHP
Industry Reference:	CVE-2015-4021
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	PHP Group PHP 5.4.x prior to 5.4.41 PHP Group PHP 5.5.x prior to 5.5.25 PHP Group PHP 5.6.x prior to 5.6.9
Vulnerability Description	An integer overflow vulnerability exists in PHP. The vulnerability is due to an issue with the parsing of TAR files by phar_parse_tarfile(). A remote attacker can exploit the vulnerability by sending crafted data to a web application running a vulnerable version of PHP. Successful exploitation could lead to the disclosure of sensitive information from the server.

Protection Overview

This protection will detect and block 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 PHP phar_parse_tarfile method Integer Overflow 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: Web Server Enforcement Violation.
Attack Information: PHP phar_parse_tarfile method Integer Overflow