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Gentoo Linux Security Advisory                           GLSA 200406-20
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: FreeS/WAN, Openswan, strongSwan: Vulnerabilities in
            certificate handling
      Date: June 25, 2004
        ID: 200406-20

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Synopsis
========

FreeS/WAN, Openswan, strongSwan and Super-FreeS/WAN contain two bugs
when authenticating PKCS#7 certificates. This could allow an attacker
to authenticate with a fake certificate.

Background
==========

FreeS/WAN, Openswan, strongSwan and Super-FreeS/WAN are Open Source
implementations of IPsec for the Linux operating system. They are all
based on the discontinued FreeS/WAN project.

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

    -------------------------------------------------------------------
     Package                  /   Vulnerable   /            Unaffected
    -------------------------------------------------------------------
  1  net-misc/freeswan             < 2.04-r1                >= 2.04-r1
                                                            == 1.99-r1
  2  net-misc/openswan              < 2.1.4                   >= 2.1.4
                                                          == 1.0.6_rc1
  3  net-misc/strongswan            < 2.1.3                   >= 2.1.3
  4  net-misc/super-freeswan      <= 1.99.7.3              Vulnerable!

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

All these IPsec implementations have several bugs in the
verify_x509cert() function, which performs certificate validation, that
make them vulnerable to malicious PKCS#7 wrapped objects.

Impact
======

With a carefully crafted certificate payload an attacker can
successfully authenticate against FreeS/WAN, Openswan, strongSwan or
Super-FreeS/WAN, or make the daemon go into an endless loop.

Workaround
==========

There is no known workaround at this time. All users are encouraged to
upgrade to the latest available version.

Resolution
==========

All FreeS/WAN 1.9x users should upgrade to the latest stable version:

    # emerge sync

    # emerge -pv "=net-misc/freeswan-1.99-r1"
    # emerge "=net-misc/freeswan-1.99-r1"

All FreeS/WAN 2.x users should upgrade to the latest stable version:

    # emerge sync

    # emerge -pv ">=net-misc/freeswan-2.04-r1"
    # emerge ">=net-misc/freeswan-2.04-r1"

All Openswan 1.x users should upgrade to the latest stable version:

    # emerge sync

    # emerge -pv "=net-misc/openswan-1.0.6_rc1"
    # emerge "=net-misc/openswan-1.0.6_rc1"

All Openswan 2.x users should upgrade to the latest stable version:

    # emerge sync

    # emerge -pv ">=net-misc/openswan-2.1.4"
    # emerge ">=net-misc/openswan-2.1.4"

All strongSwan users should upgrade to the latest stable version:

    # emerge sync

    # emerge -pv ">=net-misc/strongswan-2.1.3"
    # emerge ">=net-misc/strongswan-2.1.3"

All Super-FreeS/WAN users should migrate to the latest stable version
of Openswan. Note that Portage will force a move for Super-FreeS/WAN
users to Openswan.

    # emerge sync

    # emerge -pv "=net-misc/openswan-1.0.6_rc1"
    # emerge "=net-misc/openswan-1.0.6_rc1"

References
==========

  [ 1 ] Openswan/strongSwan Authentication Bug
        http://lists.openswan.org/pipermail/dev/2004-June/000370.html

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

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

     http://security.gentoo.org/glsa/glsa-200406-20.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
security@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2004 Gentoo Technologies, Inc; referenced text
belongs to its owner(s).

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

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