Check Point Advisories

Microsoft Internet Explorer image download spoofing

Vulnerability
Protection

Check Point Reference:	CPAI-2004-201
Date Published:	23 Dec 2009
Severity:	High
Last Updated:	Tuesday 20 December, 2016
Source:
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Microsoft Internet Explorer 5.0 Microsoft Internet Explorer 5.5 Microsoft Internet Explorer 6.0
Vulnerability Description	Microsoft Internet Explorer is a popular Web browser that supports image rendering within an HTML page. Internet Explorer also supports the saving of image resources to the local filesystem for offline viewing. A displayed image can be saved to local filesystem by selecting "Save Picture As" in the image's right-click context menu. A vulnerability exists in the way Microsoft Internet Explorer downloads and saves image files. A specially crafted filename can be made to appear to have an extension different from the one with which it is saved. This may allow a malicious user to entice the target user into saving potentially harmful files on the target system. The target system will not exhibit any unusual behavior during an attack attempt. The affected Microsoft Internet Explorer product will display a misleading filename in the the "Save As" dialog box.

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 Microsoft Internet Explorer image download spoofing 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 image download spoofing