[ASA-201807-13] networkmanager-vpnc: privilege escalation

[Jelle van der Waa]

Arch Linux Security Advisory ASA-201807-13
==========================================

Severity: High
Date    : 2018-07-20
CVE-ID  : CVE-2018-10900
Package : networkmanager-vpnc
Type    : privilege escalation
Remote  : No
Link    : https://security.archlinux.org/AVG-739

Summary
=======

The package networkmanager-vpnc before version 1.2.6-1 is vulnerable to
privilege escalation.

Resolution
==========

Upgrade to 1.2.6-1.

# pacman -Syu "networkmanager-vpnc>=1.2.6-1"

The problem has been fixed upstream in version 1.2.6.

Workaround
==========

None.

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

When initiating a VPNC connection, Network Manager spawns a new vpnc
process and passes the configuration via STDIN. By injecting a \n
character into a configuration parameter, an attacker can coerce
Network Manager 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.

References
==========

https://gitlab.gnome.org/GNOME/NetworkManager-vpnc/commit/07ac18a32b4
https://download.gnome.org/sources/NetworkManager-vpnc/1.2/NetworkManager-vpnc-1.2.6.news
https://marc.info/?l=oss-security&m=153207963021874
https://security.archlinux.org/CVE-2018-10900
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