Check Point Advisories

IBM Java java.lang.ClassLoader.defineClass Sandbox Breach (CVE-2012-4823)

Vulnerability
Protection

Check Point Reference:	CPAI-2013-1315
Date Published:	9 Apr 2013
Severity:	High
Last Updated:	Monday 01 December, 2014
Source:
Industry Reference:	CVE-2012-4823
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	A sandbox breach vulnerability has been reported IBM Java. The vulnerability exists in a certain function which calls a specific class, which later incorrectly returns a privileged ClassLoader, which is then used to instantiate a certain object. That object uses ByteArrays to create a class, which can be loaded with the privileged ClassLoader. To exploit these vulnerabilities, an attacker must entice the target user to visit a malicious site hosting the crafted applet.

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 IBM Java java.lang.ClassLoader.defineClass Sandbox Breach 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: IBM Protection Violation.
Attack Information: IBM Java java.lang.ClassLoader.defineClass Sandbox Breach