[ GLSA 200609-05 ] OpenSSL, AMD64 x86 emulation base libraries: RSA signature forgery

[Sune Kloppenborg Jeppesen <jaervosz () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200609-05
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: OpenSSL, AMD64 x86 emulation base libraries: RSA signature
            forgery
      Date: September 07, 2006
      Bugs: #146375, #146438
        ID: 200609-05

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Synopsis
========

OpenSSL fails to properly validate PKCS #1 v1.5 signatures.

Background
==========

OpenSSL is a toolkit implementing the Secure Sockets Layer, Transport
Layer Security protocols and a general-purpose cryptography library.
The x86 emulation base libraries for AMD64 contain a vulnerable version
of OpenSSL.

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

    -------------------------------------------------------------------
     Package                  /  Vulnerable  /              Unaffected
    -------------------------------------------------------------------
  1  openssl                      < 0.9.7k                   >= 0.9.7k
  2  emul-x86-linux-baselibs       < 2.5.2                    >= 2.5.2
    -------------------------------------------------------------------
     # Package 2 [app-emulation/emul-x86-linux-baselibs] only applies
       to AMD64 users.

     NOTE: Any packages listed without architecture tags apply to all
           architectures...
    -------------------------------------------------------------------
     2 affected packages
    -------------------------------------------------------------------

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

Daniel Bleichenbacher discovered that it might be possible to forge
signatures signed by RSA keys with the exponent of 3.

Impact
======

Since several CAs are using an exponent of 3 it might be possible for
an attacker to create a key with a false CA signature.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All OpenSSL users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-libs/openssl-0.9.7k"

All AMD64 x86 emulation base libraries users should upgrade to the
latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-emulation/emul-x86-linux-baselibs-2.5.2"

References
==========

  [ 1 ] CVE-2006-4339
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4339

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

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

  http://security.gentoo.org/glsa/glsa-200609-05.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

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