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Gentoo Linux Security Advisory                           GLSA 200710-18
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                                            http://security.gentoo.org/
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  Severity: High
     Title: util-linux: Local privilege escalation
      Date: October 18, 2007
      Bugs: #195390
        ID: 200710-18

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Synopsis
========

The mount and umount programs might allow local attackers to gain root
privileges.

Background
==========

util-linux is a suite of Linux programs including mount and umount,
programs used to mount and unmount filesystems.

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

    -------------------------------------------------------------------
     Package              /  Vulnerable  /                  Unaffected
    -------------------------------------------------------------------
  1  sys-apps/util-linux     < 2.12r-r8                    >= 2.12r-r8

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

Ludwig Nussel discovered that the check_special_mountprog() and
check_special_umountprog() functions call setuid() and setgid() in the
wrong order and do not check the return values, which can lead to
privileges being dropped improperly.

Impact
======

A local attacker may be able to exploit this vulnerability by using
mount helpers such as the mount.nfs program to gain root privileges and
run arbitrary commands.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All util-linux users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose
 ">=sys-apps/util-linux-2.12r-r8"

References
==========

  [ 1 ] CVE-2007-5191
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5191

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

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

  http://security.gentoo.org/glsa/glsa-200710-18.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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