[Full-disclosure] [ GLSA 200710-18 ] util-linux: Local privilege escalation

[Raphael Marichez]

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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 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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