Check Point Advisories

Microsoft OpenType Font Format Driver CMAP Table Code Execution (MS10-091; CVE-2010-3959)

Check Point Reference: CPAI-2010-333
Date Published: 14 Dec 2010
Severity: Critical
Last Updated: Tuesday 14 December, 2010
Source:
Industry Reference:CVE-2010-3959
Protection Provided by:

Security Gateway
R81, R80, R77, R75, R71, R70, R65
Who is Vulnerable?
Vulnerability Description OpenType is a font format developed jointly by Microsoft and Adobe as an extension of Apple's TrueType font format. A remote code execution vulnerability has been reported in the way Microsoft Windows OpenType Font (OTF) format driver improperly parses specially crafted OpenType fonts. A remote attacker can exploit this vulnerability via a specially crafted OTF file. Successful exploitation may allow execution of arbitrary code on a vulnerable system. The vulnerability is caused when the OpenType Font (OTF) format driver does not properly parse the CMAP table when rendering a specially crafted OpenType font. A remote attacker may exploit this issue via a specially crafted OTF file. Successful exploitation of this issue may allow the attacker to take complete control of an affected system.

Protection Overview

This protection will detect and block the transferring of malformed OTF files over HTTP.

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 OpenType Font Format Driver CMAP Table Code Execution (MS10-091) 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:  Content Protection Violation.
Attack Information:  Microsoft OpenType Font Format Driver CMAP table code execution (MS10-091)

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