[Full-disclosure] [ GLSA 200704-03 ] OpenAFS: Privilege escalation

[Raphael Marichez]

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Gentoo Linux Security Advisory                           GLSA 200704-03
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                                            http://security.gentoo.org/
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  Severity: High
     Title: OpenAFS: Privilege escalation
      Date: April 03, 2007
      Bugs: #171662
        ID: 200704-03

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Synopsis
========

OpenAFS is subject to a design flaw that could allow privilege
escalation on the client.

Background
==========

OpenAFS is a distributed network filesystem.

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

    -------------------------------------------------------------------
     Package         /  Vulnerable  /                       Unaffected
    -------------------------------------------------------------------
  1  net-fs/openafs       < 1.4.4                             >= 1.4.4

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

Benjamin Bennett discovered that the OpenAFS client contains a design
flaw where cache managers do not use authenticated server connections
when performing actions not requested by a user.

Impact
======

If setuid is enabled on the client cells, an attacker can supply a fake
FetchStatus reply that sets setuid and root ownership of a file being
executed. This could provide root access on the client. Remote attacks
may be possible if an attacker can entice a user to execute a known
file. Note that setuid is enabled by default in versions of OpenAFS
prior to 1.4.4.

Workaround
==========

Disable the setuid functionality on all client cells. This is now the
default configuration in OpenAFS.

Resolution
==========

All OpenAFS users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=net-fs/openafs-1.4.4"

References
==========

  [ 1 ] CVE-2007-1507
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1507

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

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

  http://security.gentoo.org/glsa/glsa-200704-03.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 at 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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