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Gentoo Linux Security Advisory                           GLSA 200510-11
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                                            https://security.gentoo.org/
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  Severity: Low
     Title: OpenSSL: SSL 2.0 protocol rollback
      Date: October 12, 2005
      Bugs: #108852
        ID: 200510-11

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Synopsis
=======
When using a specific option, OpenSSL can be forced to fallback to the
less secure SSL 2.0 protocol.

Background
=========
OpenSSL is a toolkit implementing the Secure Sockets Layer, Transport
Layer Security protocols and a general-purpose cryptography library.

Affected packages
================
    -------------------------------------------------------------------
     Package           /  Vulnerable  /                     Unaffected
    -------------------------------------------------------------------
  1  dev-libs/openssl     < 0.9.8-r1                       >= 0.9.8-r1
                                                            *>= 0.9.7h
                                                         *>= 0.9.7g-r1
                                                         *>= 0.9.7e-r2

Description
==========
Applications setting the SSL_OP_MSIE_SSLV2_RSA_PADDING option (or the
SSL_OP_ALL option, that implies it) can be forced by a third-party to
fallback to the less secure SSL 2.0 protocol, even if both parties
support the more secure SSL 3.0 or TLS 1.0 protocols.

Impact
=====
A man-in-the-middle attacker can weaken the encryption used to
communicate between two parties, potentially revealing sensitive
information.

Workaround
=========
If possible, disable the use of SSL 2.0 in all OpenSSL-enabled
applications.

Resolution
=========
All OpenSSL users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose dev-libs/openssl

References
=========
  [ 1 ] CAN-2005-2969
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2969
  [ 2 ] OpenSSL security advisory
        
Availability
===========
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  https://security.gentoo.org/glsa/200510-11

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
https://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.

https://creativecommons.org/licenses/by-sa/2.0/