Gentoo: sudo Arbitrary command execution
Posted by Benjamin D. Thomas   
Gentoo A vulnerability in sudo may allow local users to elevate privileges.
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Gentoo Linux Security Advisory                           GLSA 200506-22
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: sudo: Arbitrary command execution
      Date: June 23, 2005
      Bugs: #96618
        ID: 200506-22

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Synopsis
========

A vulnerability in sudo may allow local users to elevate privileges.

Background
==========

sudo allows a system administrator to give users the ability to run
commands as other users.

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

    -------------------------------------------------------------------
     Package         /  Vulnerable  /                       Unaffected
    -------------------------------------------------------------------
  1  app-admin/sudo     < 1.6.8_p9                         >= 1.6.8_p9

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

The sudoers file is used to define the actions sudo users are permitted
to perform. Charles Morris discovered that a specific layout of the
sudoers file could cause the results of an internal check to be
clobbered, leaving sudo vulnerable to a race condition.

Impact
======

Successful exploitation would permit a local sudo user to execute
arbitrary commands as another user.

Workaround
==========

Reorder the sudoers file using the visudo utility to ensure the 'ALL'
pseudo-command precedes other command definitions.

Resolution
==========

All sudo users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-admin/sudo-1.6.8_p9"

References
==========

  [ 1 ] Sudo Announcement
        http://www.sudo.ws/sudo/alerts/path_race.html

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

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

  http://security.gentoo.org/glsa/glsa-200506-22.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