[ GLSA 200606-02 ] shadow: Privilege escalation

[Sune Kloppenborg Jeppesen <jaervosz () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200606-02
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: shadow: Privilege escalation
      Date: June 07, 2006
      Bugs: #133615
        ID: 200606-02

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Synopsis
========

A security issue in shadow allows a local user to perform certain
actions with escalated privileges.

Background
==========

shadow provides a set of utilities to deal with user accounts.

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

    -------------------------------------------------------------------
     Package          /   Vulnerable   /                    Unaffected
    -------------------------------------------------------------------
  1  sys-apps/shadow      < 4.0.15-r2                     >= 4.0.15-r2

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

When the mailbox is created in useradd, the "open()" function does not
receive the three arguments it expects while O_CREAT is present, which
leads to random permissions on the created file, before fchmod() is
executed.

Impact
======

Depending on the random permissions given to the mailbox file which is
at this time owned by root, a local user may be able to open this file
for reading or writing, or even executing it, maybe as the root user.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All shadow users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=sys-apps/shadow-4.0.15-r2"

References
==========

  [ 1 ] CVE-2006-1174
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1174

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

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

  http://security.gentoo.org/glsa/glsa-200606-02.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 2006 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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