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

From: Sune Kloppenborg Jeppesen <jaervosz_at_gentoo.org>
Date: Thu, 7 Sep 2006 22:05:07 +0200

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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_at_gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

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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Received on Sep 07 2006