Gentoo: GnuTLS Denial of Service vulnerability
Posted by Benjamin D. Thomas   
Gentoo The GnuTLS library is vulnerable to Denial of Service attacks.
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Gentoo Linux Security Advisory                           GLSA 200505-04
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: GnuTLS: Denial of Service vulnerability
      Date: May 09, 2005
      Bugs: #90726
        ID: 200505-04

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Synopsis
========

The GnuTLS library is vulnerable to Denial of Service attacks.

Background
==========

GnuTLS is a free TLS 1.0 and SSL 3.0 implementation for the GNU
project.

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

    -------------------------------------------------------------------
     Package          /  Vulnerable  /                      Unaffected
    -------------------------------------------------------------------
  1  net-libs/gnutls       < 1.2.3                            >= 1.2.3
                                                            *>= 1.0.25

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

A vulnerability has been discovered in the record packet parsing in the
GnuTLS library. Additionally, a flaw was also found in the RSA key
export functionality.

Impact
======

A remote attacker could exploit this vulnerability and cause a Denial
of Service to any application that utilizes the GnuTLS library.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All GnuTLS users should remove the existing installation and upgrade to
the latest version:

    # emerge --sync
    # emerge --unmerge gnutls
    # emerge --ask --oneshot --verbose net-libs/gnutls

Due to small API changes with the previous version, please do the
following to ensure your applications are using the latest GnuTLS that
you just emerged.

    # revdep-rebuild --soname-regexp libgnutls.so.1[0-1]

Previously exported RSA keys can be fixed by executing the following
command on the key files:

    # certtool -k infile outfile

References
==========

  [ 1 ] GnuTLS Announcement
        http://lists.gnupg.org/pipermail/gnutls-dev/2005-April/000858.html
  [ 2 ] CAN-2005-1431
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1431

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

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

  http://security.gentoo.org/glsa/glsa-200505-04.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 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.

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