Vulnerability Note VU#275247

FreeType 2 CFF font stack corruption vulnerability

Overview

FreeType 2 contains a vulnerability in the processing of CFF fonts, which may allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.

I. Description

FreeType is a font engine that can open and process font files. FreeType 2 includes the ability to handle a number of font types, including Compact Font Format (CFF). FreeType is used by a number of applications, including PDF readers, web browsers, and other applications. FreeType 2 contains a flaw in the handling of some CFF opcodes, which can result in stack corruption. This can allow arbitrary code execution.

This vulnerability is being used in the iPhone PDF JailBreak exploit.

II. Impact

By causing an application that uses FreeType to parse a specially-crafted CFF font, a remote, unauthenticated attacker may be able to execute arbitrary code on a vulnerable system. This can occur as the result of opening a PDF document or viewing a web page.

III. Solution

Apply an update

This vulnerability is fixed in the FreeType source tree. Please check with your vendor for an update.

Vendor Information

Vendor	Status	Date Notified	Date Updated
Apple Inc.	Affected	2010-08-04	2010-08-11
Conectiva Inc.	Unknown	2010-08-10	2010-08-10
Cray Inc.	Unknown	2010-08-10	2010-08-10
Debian GNU/Linux	Affected	2010-08-10	2010-08-11
DragonFly BSD Project	Unknown	2010-08-10	2010-08-10
EMC Corporation	Unknown	2010-08-10	2010-08-10
Engarde Secure Linux	Unknown	2010-08-10	2010-08-10
F5 Networks, Inc.	Affected	2010-08-10	2010-08-11
Fedora Project	Unknown	2010-08-10	2010-08-10
Foxit Software Company	Affected	2010-08-06	2010-08-06
FreeBSD Project	Unknown	2010-08-10	2010-08-10
Fujitsu	Unknown	2010-08-10	2010-08-10
Gentoo Linux	Affected	2010-08-10	2010-08-11
Google	Not Affected	2010-09-10	2010-09-14
Hewlett-Packard Company	Unknown	2010-08-10	2010-08-10
Hitachi	Unknown	2010-08-10	2010-08-10
IBM Corporation	Unknown	2010-08-10	2010-08-10
IBM Corporation (zseries)	Unknown	2010-08-10	2010-08-10
IBM eServer	Unknown	2010-08-10	2010-08-10
Infoblox	Unknown	2010-08-10	2010-08-10
Juniper Networks, Inc.	Not Affected	2010-08-10	2010-08-23
Mandriva S. A.	Unknown	2010-08-10	2010-08-10
Microsoft Corporation	Unknown	2010-08-10	2010-08-10
MontaVista Software, Inc.	Unknown	2010-08-10	2010-08-10
NEC Corporation	Unknown	2010-08-10	2010-08-10
NetBSD	Unknown	2010-08-10	2010-08-10
Nokia	Unknown	2010-08-10	2010-08-10
Novell, Inc.	Unknown	2010-08-10	2010-08-10
Openwall GNU/*/Linux	Not Affected	2010-08-10	2010-08-23
QNX Software Systems Inc.	Unknown	2010-08-10	2010-08-10
Red Hat, Inc.	Affected		2010-08-05
SafeNet	Unknown	2010-08-10	2010-08-10
Silicon Graphics, Inc.	Unknown	2010-08-10	2010-08-10
Slackware Linux Inc.	Unknown	2010-08-10	2010-08-10
Sony Corporation	Unknown	2010-08-10	2010-08-10
Sun Microsystems, Inc.	Unknown	2010-08-10	2010-08-10
SUSE Linux	Affected	2010-08-10	2010-09-10
The SCO Group	Unknown	2010-08-10	2010-08-10
Turbolinux	Unknown	2010-08-10	2010-08-10
Ubuntu	Unknown	2010-08-10	2010-08-10
Unisys	Unknown	2010-08-10	2010-08-10
Wind River Systems, Inc.	Affected	2010-08-10	2010-08-11

References

http://www.securityfocus.com/bid/42241
http://secunia.com/advisories/40816
http://securitytracker.com/alerts/2010/Aug/1024283.html
https://rhn.redhat.com/errata/RHSA-2010-0607.html
http://support.apple.com/kb/HT4291
http://support.apple.com/kb/HT4292
http://www.f-secure.com/weblog/archives/00002002.html
http://www.foxitsoftware.com/pdf/reader/security_bulletins.php#iphone

Credit

This vulnerability was discovered being exploited in the wild. Additional analysis was performed by Braden Thomas of Apple Product Security.

This document was written by Will Dormann.

Other Information

Date Public:	2010-08-02
Date First Published:	2010-08-05
Date Last Updated:	2010-09-14
CERT Advisory:
CVE-ID(s):	CVE-2010-1797
NVD-ID(s):	CVE-2010-1797
US-CERT Technical Alerts:
Severity Metric:	13.39
Document Revision:	29

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Produced 2010 by US-CERT, a government organization
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