Check Point Advisories

Microsoft Windows MHTML URL Parsing Information Disclosure (MS08-048; CVE-2008-1448)

Vulnerability
Protection

Check Point Reference:	CPAI-2008-126
Date Published:	12 Aug 2008
Severity:	High
Last Updated:	Tuesday 12 August, 2008
Source:
Industry Reference:	CVE-2008-1448
Protection Provided by:	Security Gateway R81, R80, R77, R75, R71, R70, R65
Who is Vulnerable?
Vulnerability Description	MHTML (MIME Encapsulation of Aggregate HTML) is an Internet standard that defines the MIME structure that is used to wrap HTML content. An information disclosure vulnerability has been reported in Outlook Express and Windows Mail due to a flaw in the MHTML protocol. The vulnerability is caused when the Windows MHTML protocol handler is parsing a URL and incorrectly interprets HTTP headers when returning MHTML content. To trigger this issue, an attacker may create a malicious web page that will exploit this vulnerability. Successful exploitation could allow information disclosure.

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 / R71 / R70 / R65

In the IPS tab, click Protections and find the Microsoft Windows MHTML URL Parsing Information Disclosure (MS08-048) 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 Windows MHTML URL parsing information disclosure (MS08-048)