Check Point Advisories

Microsoft Office Content-Disposition Header Code Execution (MS08-056; CVE-2008-4020)

Check Point Reference: CPAI-2008-151
Date Published: 2 Oct 2008
Severity: Medium
Last Updated: Thursday 02 October, 2008
Industry Reference:CVE-2008-4020
Protection Provided by:

Security Gateway
R81, R80, R77, R75, R71, R70, R65

Who is Vulnerable?
Vulnerability Description Cross-site scripting (XSS) could enable an attacker to inject code into a user's session with a Web site. A cross-site scripting vulnerability has been reported in Microsoft Office. The vulnerability is due to a flaw in the cdo:// protocol that does not respect the "content-disposition: attachment" header and always renders the content. A remote attacker may exploit this issue by convincing a user to enter a site that utilizes the problematic header. Successfully exploitation of this vulnerability could allow the attacker to inject a client side script in the user's browser.

Protection Overview

This protection will detect and block the vulnerable CDO URLs.

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

  1. In the IPS tab, click Protections and find the Microsoft Office Content-Disposition Header Code Execution (MS08-056) protection using the Search tool and Edit the protection's settings.
  2. Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name:  Web Client Enforcement Violation.
Attack Information:  Microsoft Office Content-Disposition header code execution (MS08-056)

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