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Gentoo Linux Security Advisory GLSA 201706-27
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https://security.gentoo.org/
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Severity: Normal
Title: FreeRADIUS: Security bypass
Date: June 27, 2017
Bugs: #620186
ID: 201706-27

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Synopsis
========

A vulnerability in FreeRADIUS might allow remote attackers to bypass
authentication.

Background
==========

FreeRADIUS is an open source RADIUS authentication server.

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

——————————————————————-
Package / Vulnerable / Unaffected
——————————————————————-
1 net-dialup/freeradius < 3.0.14 >= 3.0.14

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

It was discovered that the implementation of TTLS and PEAP in
FreeRADIUS skips inner authentication when it handles a resumed TLS
connection. The affected versions of FreeRADIUS fails to reliably
prevent the resumption of unauthenticated sessions unless the TLS
session cache is disabled completely.

Impact
======

An unauthenticated remote user can bypass authentication by starting a
session, and then resuming an unauthenticated TLS session before inner
authentication has been completed successfully.

Workaround
==========

Set “enabled = no” in the cache subsection of eap module settings to
disable TLS session caching.

Resolution
==========

All FreeRADIUS users should upgrade to the latest version:

# emerge –sync
# emerge –ask –oneshot –verbose “>=net-dialup/freeradius-3.0.14”

References
==========

[ 1 ] CVE-2017-9148
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-9148

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

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

https://security.gentoo.org/glsa/201706-27

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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