Check Point Advisories

Internet Explorer Long URL Buffer Overflow (CVE-2006-3869; CVE-2006-3873)

Vulnerability
Protection

Check Point Reference:	CPAI-2006-240
Date Published:	22 Mar 2010
Severity:	High
Last Updated:	Monday 22 March, 2010
Source:
Industry Reference:	CVE-2006-3869 CVE-2006-3873
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	Microsoft Internet Explorer (IE) is the most widely used web browser application. The browser is capable of processing HTML, images, scripting languages, and various other popular Internet specifications. A vulnerability has been reportedly introduced into certain versions of Microsoft Internet Explorer with the introduction of a security update. The vulnerability exists in the processing of compressed data used with the HTTP 1.1 protocol. An attacker could exploit this vulnerability to cause a denial of service condition or possibly inject and execute arbitrary code on a vulnerable host. In case of an attack where code injection is not successful, the affected browser may terminate or display a warning message. In case of an attack where code injection and execution is successful, the behavior of the host system is dependent on the intented purpose of the injected code. It is likely that the vulnerable browser will stop functioning or terminate as a result.

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 Internet Explorer Long URL Buffer 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 Client Enforcement Violation.
Attack Information: Microsoft Internet Explorer long url buffer overflow