Gentoo: FreeType User-assisted execution of arbitrary code
Posted by Benjamin D. Thomas   
Gentoo Font parsing vulnerabilities in FreeType might lead to user-assisted execution of arbitrary code.
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Gentoo Linux Security Advisory                           GLSA 200806-10
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: FreeType: User-assisted execution of arbitrary code
      Date: June 23, 2008
      Bugs: #225851
        ID: 200806-10

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Synopsis
========

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

Background
==========

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

Affected packages
=================

    -------------------------------------------------------------------
     Package              /  Vulnerable  /                  Unaffected
    -------------------------------------------------------------------
  1  media-libs/freetype       < 2.3.6                        >= 2.3.6

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).

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All FreeType users should upgrade to the latest version:

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

References
==========

  [ 1 ] CVE-2008-1806
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1806
  [ 2 ] CVE-2008-1807
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1807
  [ 3 ] CVE-2008-1808
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1808

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  http://security.gentoo.org/glsa/glsa-200806-10.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2008 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5