Check Point Advisories

Internet Explorer HTTPS Proxy (CVE-2005-2830)

Vulnerability
Protection

Check Point Reference:	CPAI-2005-344
Date Published:	25 Jul 2010
Severity:	High
Last Updated:	Thursday 02 January, 2014
Source:
Industry Reference:	CVE-2005-2830
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	Microsoft Internet Explorer is a popular web browser bundled with the Microsoft Windows operating system. The browser is capable of communication with HTTP and HTTPS compliant servers. The browser may also be set up to use a proxy for accessing remote resources. An information disclosure vulnerability exists in Microsoft Internet Explorer. The vulnerability can occur when Internet Explorer is configured to use an HTTPS proxy with Basic authentication. This flaw may be exploited by an attacker to read an HTTPS request URL sent by Internet Explorer despite the use of an encrypted connection. The vulnerable client application resubmits an HTTPS request initially made to a proxy server as an HTTP request as a response to an HTTP 407 message received from the proxy. The full URL of the HTTPS request is disclosed 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 HTTPS Proxy 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: Internet Explorer HTTPS Proxy