From: Raphael Marichez (falcogentoo.org)
Date: Thu Oct 18 2007 - 17:46:04 CDT

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Gentoo Linux Security Advisory GLSA 200710-20
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: PDFKit, ImageKits: Buffer overflow
      Date: October 18, 2007
      Bugs: #188185
        ID: 200710-20

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Synopsis
========

PDFKit and ImageKits are vulnerable to an integer overflow and a stack
overflow allowing for the user-assisted execution of arbitrary code.

Background
==========

PDFKit is a framework for rendering of PDF content in GNUstep
applications. ImageKits is a collection of frameworks to support
imaging in GNUstep applications.

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

    -------------------------------------------------------------------
     Package / Vulnerable / Unaffected
    -------------------------------------------------------------------
  1 gnustep-libs/pdfkit <= 0.9_pre062906 Vulnerable!
  2 gnustep-libs/imagekits <= 0.6 Vulnerable!
    -------------------------------------------------------------------
     NOTE: Certain packages are still vulnerable. Users should migrate
           to another package if one is available or wait for the
           existing packages to be marked stable by their
           architecture maintainers.
    -------------------------------------------------------------------
     2 affected packages on all of their supported architectures.
    -------------------------------------------------------------------

Description
===========

Maurycy Prodeus discovered an integer overflow vulnerability possibly
leading to a stack-based buffer overflow in the XPDF code which PDFKit
is based on. ImageKits also contains a copy of PDFKit.

Impact
======

By enticing a user to view a specially crafted PDF file with a viewer
based on ImageKits or PDFKit such as Gentoo's ViewPDF, a remote
attacker could cause an overflow, potentially resulting in the
execution of arbitrary code with the privileges of the user running the
application.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

PDFKit and ImageKits are not maintained upstream, so the packages were
masked in Portage. We recommend that users unmerge PDFKit and
ImageKits:

    # emerge --unmerge gnustep-libs/pdfkit
    # emerge --unmerge gnustep-libs/imagekits

As an alternative, users should upgrade their systems to use PopplerKit
instead of PDFKit and Vindaloo instead of ViewPDF.

References
==========

  [ 1 ] CVE-2007-3387
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3387
  [ 2 ] GLSA 200709-12
        http://www.gentoo.org/security/en/glsa/glsa-200709-12.xml

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

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

  http://security.gentoo.org/glsa/glsa-200710-20.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
securitygentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2007 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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