GLSA-201808-03 : NetworkManager VPNC plugin: Privilege escalation - Nessus

High Plugin ID: 112077

This page contains detailed information about the GLSA-201808-03 : NetworkManager VPNC plugin: Privilege escalation Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

Table Of Contents

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Plugin Overview
Vulnerability Information

Synopsis
Description
Solution

Public Exploits
Risk Information
Plugin Source
How to Run
References
Version

Plugin Overview

ID: 112077
Name: GLSA-201808-03 : NetworkManager VPNC plugin: Privilege escalation
Filename: gentoo_GLSA-201808-03.nasl
Vulnerability Published: N/A
This Plugin Published: 2018-08-23
Last Modification Time: 2019-04-05
Plugin Version: 1.4
Plugin Type: local
Plugin Family: Gentoo Local Security Checks
Dependencies: ssh_get_info.nasl
Required KB Items [?]: Host/Gentoo/qpkg-list, Host/Gentoo/release, Host/local_checks_enabled

Vulnerability Information

Severity: High
Vulnerability Published: N/A
Patch Published: 2018-08-22
CVE [?]: CVE-2018-10900
CPE [?]: cpe:/o:gentoo:linux, p-cpe:/a:gentoo:linux:networkmanager-vpnc

Synopsis

The remote Gentoo host is missing one or more security-related patches.

Description

The remote host is affected by the vulnerability described in GLSA-201808-03 (NetworkManager VPNC plugin: Privilege escalation)

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.

Solution

All NetworkManager VPNC plugin users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose '>=net-misc/networkmanager-vpnc-1.2.6'

Public Exploits

Target Network Port(s): N/A
Target Asset(s): N/A
Exploit Available: True (Metasploit Framework, Exploit-DB)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the GLSA-201808-03 : NetworkManager VPNC plugin: Privilege escalation vulnerability:

Metasploit: exploit/linux/local/network_manager_vpnc_username_priv_esc
[Network Manager VPNC Username Privilege Escalation]
Exploit-DB: exploits/linux/local/45313.rb
[EDB-45313: Network Manager VPNC 1.2.6 - 'Username' Local Privilege Escalation (Metasploit)]

Before running any exploit against any system, make sure you are authorized by the owner of the target system(s) to perform such activity. In any other case, this would be considered as an illegal activity.

WARNING: Beware of using unverified exploits from sources such as GitHub or Exploit-DB. These exploits and PoCs could contain malware. For more information, see how to use exploits safely.

Risk Information

CVSS V2 Vector [?]: AV:L/AC:L/Au:N/C:C/I:C/A:C/E:F/RL:OF/RC:C

CVSS Base Score:	7.2 (High)
Impact Subscore:	10.0
Exploitability Subscore:	3.9
CVSS Temporal Score:	6.0 (Medium)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	6.0 (Medium)

CVSS V3 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

CVSS Base Score:	7.8 (High)
Impact Subscore:	5.9
Exploitability Subscore:	1.8
CVSS Temporal Score:	7.2 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	7.2 (High)

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Plugin Source

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Gentoo Linux Security Advisory GLSA 201808-03.
#
# The advisory text is Copyright (C) 2001-2018 Gentoo Foundation, Inc.
# and licensed under the Creative Commons - Attribution / Share Alike 
# license. See http://creativecommons.org/licenses/by-sa/3.0/
#

include("compat.inc");

if (description)
{
  script_id(112077);
  script_version("1.4");
  script_cvs_date("Date: 2019/04/05 23:25:06");

  script_cve_id("CVE-2018-10900");
  script_xref(name:"GLSA", value:"201808-03");

  script_name(english:"GLSA-201808-03 : NetworkManager VPNC plugin: Privilege escalation");
  script_summary(english:"Checks for updated package(s) in /var/db/pkg");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Gentoo host is missing one or more security-related
patches."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"The remote host is affected by the vulnerability described in GLSA-201808-03
(NetworkManager VPNC plugin: Privilege escalation)

    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."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://security.gentoo.org/glsa/201808-03"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"All NetworkManager VPNC plugin users should upgrade to the latest
      version:
      # emerge --sync
      # emerge --ask --oneshot --verbose
      '>=net-misc/networkmanager-vpnc-1.2.6'"
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Network Manager VPNC Username Privilege Escalation');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:gentoo:linux:networkmanager-vpnc");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:gentoo:linux");

  script_set_attribute(attribute:"patch_publication_date", value:"2018/08/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/08/23");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Gentoo Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Gentoo/release", "Host/Gentoo/qpkg-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("qpkg.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Gentoo/release")) audit(AUDIT_OS_NOT, "Gentoo");
if (!get_kb_item("Host/Gentoo/qpkg-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;

if (qpkg_check(package:"net-misc/networkmanager-vpnc", unaffected:make_list("ge 1.2.6"), vulnerable:make_list("lt 1.2.6"))) flag++;

if (flag)
{
  if (report_verbosity > 0) security_hole(port:0, extra:qpkg_report_get());
  else security_hole(0);
  exit(0);
}
else
{
  tested = qpkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "NetworkManager VPNC plugin");
}

The latest version of this script can be found in these locations depending on your platform:

Linux / Unix:
/opt/nessus/lib/nessus/plugins/gentoo_GLSA-201808-03.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\gentoo_GLSA-201808-03.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/gentoo_GLSA-201808-03.nasl

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How to Run

Here is how to run the GLSA-201808-03 : NetworkManager VPNC plugin: Privilege escalation as a standalone plugin via the Nessus web user interface (https://localhost:8834/):

Click to start a New Scan.
Select Advanced Scan.
Navigate to the Plugins tab.
On the top right corner click to Disable All plugins.
On the left side table select Gentoo Local Security Checks plugin family.
On the right side table select GLSA-201808-03 : NetworkManager VPNC plugin: Privilege escalation plugin ID 112077.
Specify the target on the Settings tab and click to Save the scan.
Run the scan.

Here are a few examples of how to run the plugin in the command line. Note that the examples below demonstrate the usage on the Linux / Unix platform.

Basic usage:

/opt/nessus/bin/nasl gentoo_GLSA-201808-03.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a gentoo_GLSA-201808-03.nasl -t <IP/HOST>

Run the plugin with trace script execution written to the console (useful for debugging):

/opt/nessus/bin/nasl -T - gentoo_GLSA-201808-03.nasl -t <IP/HOST>

Run the plugin with using a state file for the target and updating it (useful for running multiple plugins on the target):

/opt/nessus/bin/nasl -K /tmp/state gentoo_GLSA-201808-03.nasl -t <IP/HOST>

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References

GLSA | Gentoo Linux Security Advisory:

201808-03

See also:

Similar and related Nessus plugins:

111467 - Debian DLA-1454-1 : network-manager-vpnc security update
111234 - Debian DSA-4253-1 : network-manager-vpnc - security update
111361 - Fedora 27 : 1:NetworkManager-vpnc (2018-ac02463f82)
120880 - Fedora 28 : 1:NetworkManager-vpnc (2018-eb5ea0abaf)
111779 - openSUSE Security Update : NetworkManager-vpnc (openSUSE-2018-859)
111662 - SUSE SLED12 Security Update : Recommended update for NetworkManager-vpnc (SUSE-SU-2018:2297-1)

Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file gentoo_GLSA-201808-03.nasl version 1.4. For more plugins, visit the Nessus Plugin Library.

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GLSA-201808-03 : NetworkManager VPNC plugin: Privilege escalation - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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