[ GLSA 200710-01 ] RPCSEC_GSS library: Buffer overflow

[Pierre-Yves Rofes <py () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200710-01
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                                            http://security.gentoo.org/
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  Severity: High
     Title: RPCSEC_GSS library: Buffer overflow
      Date: October 04, 2007
      Bugs: #191479
        ID: 200710-01

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Synopsis
========

A buffer overflow vulnerability has been discovered in librpcsecgss.

Background
==========

librpcsecgss is an implementation of RPCSEC_GSS for secure RPC
communications.

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

    -------------------------------------------------------------------
     Package                /  Vulnerable  /                Unaffected
    -------------------------------------------------------------------
  1  net-libs/librpcsecgss       < 0.16                        >= 0.16

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

A stack based buffer overflow has been discovered in the
svcauth_gss_validate() function in file lib/rpc/svc_auth_gss.c when
processing an overly long string in a RPC message.

Impact
======

A remote attacker could send a specially crafted RPC request to an
application relying on this library, e.g NFSv4 or Kerberos
(GLSA-200709-01), resulting in the execution of arbitrary code with the
privileges of the user running the application.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All librpcsecgss users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-libs/librpcsecgss-0.16"

References
==========

  [ 1 ] CVE-2007-3999
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3999
  [ 2 ] GLSA-200709-01
        http://www.gentoo.org/security/en/glsa/glsa-200709-01.xml

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

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

  http://security.gentoo.org/glsa/glsa-200710-01.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 2007 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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