[ GLSA 200501-28 ] Xpdf, GPdf: Stack overflow in Decrypt::makeFileKey2

[Thierry Carrez <koon () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200501-28
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Xpdf, GPdf: Stack overflow in Decrypt::makeFileKey2
      Date: January 21, 2005
      Bugs: #77888, #78128
        ID: 200501-28

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Synopsis
========

A stack overflow was discovered in Xpdf, potentially resulting in the
execution of arbitrary code. GPdf includes Xpdf code and therefore is
vulnerable to the same issue.

Background
==========

Xpdf is an open source viewer for Portable Document Format (PDF) files.
GPdf is a Gnome-based PDF viewer that includes some Xpdf code.

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

    -------------------------------------------------------------------
     Package        /  Vulnerable  /                        Unaffected
    -------------------------------------------------------------------
  1  app-text/xpdf     <= 3.00-r7                           >= 3.00-r8
  2  app-text/gpdf       < 2.8.2                              >= 2.8.2
    -------------------------------------------------------------------
     2 affected packages on all of their supported architectures.
    -------------------------------------------------------------------

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

iDEFENSE reports that the Decrypt::makeFileKey2 function in Xpdf's
Decrypt.cc insufficiently checks boundaries when processing /Encrypt
/Length tags in PDF files.

Impact
======

An attacker could entice an user to open a specially-crafted PDF file
which would trigger a stack overflow, potentially resulting in
execution of arbitrary code with the rights of the user running Xpdf or
GPdf.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Xpdf users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-text/xpdf-3.00-r8"

All GPdf users should also upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-text/gpdf-2.8.2"

References
==========

  [ 1 ] CAN-2005-0064
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0064
  [ 2 ] iDEFENSE Advisory

http://www.idefense.com/application/poi/display?id=186&type=vulnerabilities&flashstatus=true

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

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

  http://security.gentoo.org/glsa/glsa-200501-28.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 2005 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/2.0

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