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Gentoo Linux Security Advisory                           GLSA 201706-01
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                                           https://security.gentoo.org/
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 Severity: High
    Title: MUNGE: Privilege escalation
     Date: June 06, 2017
     Bugs: #602596
       ID: 201706-01

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Synopsis
========

Gentoo's MUNGE ebuilds are vulnerable to privilege escalation due to
improper permissions.

Background
==========

An authentication service for creating and validating credentials.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  sys-auth/munge             < 0.5.10-r2              >= 0.5.10-r2

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

It was discovered that Gentoo's default MUNGE installation suffered
from a privilege escalation vulnerability (munge user to root) due to
improper permissions and a runscript which called chown() on a user
controlled file.

Impact
======

A local attacker, who either is already MUNGE's system user or belongs
to MUNGE's group, could potentially escalate privileges.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All MUNGE users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=sys-auth/munge-0.5.10-r2"

References
==========


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

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

 https://security.gentoo.org/glsa/201706-01

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
https://bugs.gentoo.org.

License
=======

Copyright 2017 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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