FreeType: User-assisted execution of arbitrary code

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Updated June 23, 2008

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200806-10 / freetype
Release Date	June 23, 2008
Latest Revision	May 28, 2009: 03
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
media-libs/freetype	< 2.3.6	>= 2.3.6, revision >= 1.4_pre20080316-r1	All supported architectures

Related bugreports: #225851

Synopsis

Font parsing vulnerabilities in FreeType might lead to user-assisted execution of arbitrary code.

2. Impact Information

Background

FreeType is a font rendering library for TrueType Font (TTF) and Printer Font Binary (PFB).

Description

Regenrecht reported multiple vulnerabilities in FreeType via iDefense:

An integer overflow when parsing values in the Private dictionary table in a PFB file, leading to a heap-based buffer overflow (CVE-2008-1806).
An invalid free() call related to parsing an invalid "number of axes" field in a PFB file (CVE-2008-1807).
Multiple off-by-one errors when parsing PBF and TTF files, leading to heap-based buffer overflows (CVE-2008-1808).

Impact

A remote attacker could entice a user to open a specially crafted TTF or PBF file, possibly resulting in the execution of arbitrary code with the privileges of the user running an application linked against FreeType (such as the X.org X server, running as root).

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All FreeType users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=media-libs/freetype-2.3.6"

4. References