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[gentoo-announce] [ GLSA 201808-03 ] NetworkManager VPNC plugin: Privilege escalation

Posted on 22 August 2018
Gentoo-announce

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From: Thomas Deutschmann <whissi@gentoo.org>
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To: gentoo-announce@lists.gentoo.org
Message-ID: <e291e423-4496-912c-f527-5d3764670ae2@gentoo.org>
Subject: [ GLSA 201808-03 ] NetworkManager VPNC plugin: Privilege escalation

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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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