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TUCoPS :: Linux :: Gentoo :: bx3577.htm

FreeType: User-assisted execution of arbitrary code



FreeType: User-assisted execution of arbitrary code
FreeType: 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 

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