[Full-disclosure] [ GLSA 200902-01 ] sudo: Privilege escalation

[Tobias Heinlein]

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Gentoo Linux Security Advisory                           GLSA 200902-01
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                                            http://security.gentoo.org/
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  Severity: High
     Title: sudo: Privilege escalation
      Date: February 06, 2009
      Bugs: #256633
        ID: 200902-01

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Synopsis
========

A vulnerability in sudo may allow for privilege escalation.

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       < 1.7.0                             >= 1.7.0

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

Harald Koenig discovered that sudo incorrectly handles group
specifications in Runas_Alias (and related) entries when a group is
specified in the list (using %group syntax, to allow a user to run
commands as any member of that group) and the user is already a member
of that group.

Impact
======

A local attacker could possibly run commands as an arbitrary system
user (including root).

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All sudo users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-admin/sudo-1.7.0"

References
==========

  [ 1 ] CVE-2009-0034
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0034

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

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

  http://security.gentoo.org/glsa/glsa-200902-01.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 at gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2009 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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