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Gentoo Linux Security Advisory GLSA 201808-03
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https://security.gentoo.org/
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Severity: Normal
Title: NetworkManager VPNC plugin: Privilege escalation
Date: August 22, 2018
Bugs: #661712
ID: 201808-03

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Synopsis
========

A vulnerability in NetworkManager VPNC plugin allows local users to
escalate privileges.

Background
==========

NetworkManager is an universal network configuration daemon for
laptops, desktops, servers and virtualization hosts.

The VPNC plugin provides easy access Cisco Concentrator based VPN’s
utilizing NetworkManager.

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

——————————————————————-
Package / Vulnerable / Unaffected
——————————————————————-
1 net-misc/networkmanager-vpnc
< 1.2.6 >= 1.2.6

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

When initiating a VPNC connection, NetworkManager spawns a new vpnc
process and passes the configuration via STDIN. By injecting a special
character into a configuration parameter, an attacker can coerce
NetworkManager to set the Password helper option to an attacker
controlled executable file.

Impact
======

A local attacker is able to escalate privileges via a specially crafted
configuration file.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All NetworkManager VPNC plugin users should upgrade to the latest
version:

# emerge –sync
# emerge –ask –oneshot -v “>=net-misc/networkmanager-vpnc-1.2.6”

References
==========

[ 1 ] CVE-2018-10900
https://nvd.nist.gov/vuln/detail/CVE-2018-10900

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

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

https://security.gentoo.org/glsa/201808-03

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 2018 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.

https://creativecommons.org/licenses/by-sa/2.5

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