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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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