Gentoo: GnuPG Multiple vulnerabilities
Posted by Benjamin D. Thomas   
Gentoo GnuPG is vulnerable to a buffer overflow and an erroneous function pointer dereference that can result in the execution of arbitrary code.
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Gentoo Linux Security Advisory                           GLSA 200612-03
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: GnuPG: Multiple vulnerabilities
      Date: December 10, 2006
      Bugs: #156476, #156947
        ID: 200612-03

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Synopsis
========

GnuPG is vulnerable to a buffer overflow and an erroneous function
pointer dereference that can result in the execution of arbitrary code.

Background
==========

The GNU Privacy Guard, GnuPG, is a free replacement for the PGP suite
of cryptographic software.

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

    -------------------------------------------------------------------
     Package          /  Vulnerable  /                      Unaffected
    -------------------------------------------------------------------
  1  app-crypt/gnupg       < 1.4.6                            >= 1.4.6

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

Hugh Warrington has reported a boundary error in GnuPG, in the
"ask_outfile_name()" function from openfile.c: the
make_printable_string() function could return a string longer than
expected. Additionally, Tavis Ormandy of the Gentoo Security Team
reported a design error in which a function pointer can be incorrectly
dereferenced.

Impact
======

A remote attacker could entice a user to interactively use GnuPG on a
crafted file and trigger the boundary error, which will result in a
buffer overflow. They could also entice a user to process a signed or
encrypted file with gpg or gpgv, possibly called through another
application like a mail client, to trigger the dereference error. Both
of these vulnerabilities would result in the execution of arbitrary
code with the permissions of the user running GnuPG. gpg-agent, gpgsm
and other tools are not affected.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All GnuPG users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-crypt/gnupg-1.4.6"

References
==========

  [ 1 ] CVE-2006-6169
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-6169
  [ 2 ] CVE-2006-6235
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-6235

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

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

  http://security.gentoo.org/glsa/glsa-200612-03.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 2006 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