Check Point Advisories

Microsoft OpenType CFF Driver Font Data Stack Overflow (MS11-032; CVE-2011-0034)

Vulnerability
Protection

Check Point Reference:	CPAI-2011-221
Date Published:	12 Apr 2011
Severity:	Critical
Last Updated:	Monday 13 January, 2014
Source:
Industry Reference:	CVE-2011-0034
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. An OpenType font file contains data, in table format, that comprises either a TrueType or a PostScript outline font. A remote code execution vulnerability has been reported in the way Microsoft Windows OpenType Compact Font Format (CFF) driver improperly parses specially crafted OpenType fonts. The vulnerability is caused when the Windows OpenType Compact Font Format (CFF) driver fails to properly validate the values read in from specially crafted OpenType fonts. A remote attacker may exploit this issue via a specially crafted OpenType font 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

In the IPS tab, click Protections and find the Microsoft OpenType CFF Driver Font Data Stack Overflow (MS11-032) 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: Content Protection Violation.
Attack Information: Microsoft OpenType CFF driver font data stack overflow (MS11-032)