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OpenSSL: Certificate validation error



OpenSSL: Certificate validation error
OpenSSL: Certificate validation error



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Gentoo Linux Security Advisory                           GLSA 200902-02
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http://security.gentoo.org/ 
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  Severity: Normal
     Title: OpenSSL: Certificate validation error
      Date: February 12, 2009
      Bugs: #251346
        ID: 200902-02

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Synopsis
=======
An error in the OpenSSL certificate chain validation might allow for
spoofing attacks.

Background
=========
OpenSSL is an Open Source toolkit implementing the Secure Sockets Layer
(SSL v2/v3) and Transport Layer Security (TLS v1) as well as a general
purpose cryptography library.

Affected packages
================
    -------------------------------------------------------------------
     Package           /  Vulnerable  /                     Unaffected
    -------------------------------------------------------------------
  1  dev-libs/openssl      < 0.9.8j                          >= 0.9.8j

Description
==========
The Google Security Team reported that several functions incorrectly
check the result after calling the EVP_VerifyFinal() function, allowing
a malformed signature to be treated as a good signature rather than as
an error. This issue affects the signature checks on DSA and ECDSA keys
used with SSL/TLS.

Impact
=====
A remote attacker could exploit this vulnerability and spoof arbitrary
names to conduct Man-In-The-Middle attacks and intercept sensitive
information.

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-0.9.8j"

References
=========
  [ 1 ] CVE-2008-5077
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-5077 

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

http://security.gentoo.org/glsa/glsa-200902-02.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 2009 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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