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[gentoo-announce] [ GLSA 201706-01 ] MUNGE: Privilege escalation

Posted on 06 June 2017
Gentoo-announce

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From: Yury German <blueknight@gentoo.org>
To: gentoo-announce@lists.gentoo.org
Message-ID: <751eccc7-6379-f42d-47bf-33859bb39c36@gentoo.org>
Subject: [ GLSA 201706-01 ] MUNGE: Privilege escalation

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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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