Cisco AnyConnect Secure Mobility Client < 2.3.254 Multiple Vulnerabilities - Nessus

High Plugin ID: 54954

This page contains detailed information about the Cisco AnyConnect Secure Mobility Client < 2.3.254 Multiple Vulnerabilities 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: 54954
Name: Cisco AnyConnect Secure Mobility Client < 2.3.254 Multiple Vulnerabilities
Filename: cisco_anyconnect_vpn_2_3_254.nasl
Vulnerability Published: 2011-06-01
This Plugin Published: 2011-06-03
Last Modification Time: 2018-11-15
Plugin Version: 1.16
Plugin Type: local
Plugin Family: Windows
Dependencies: cisco_anyconnect_vpn_installed.nasl
Required KB Items [?]: SMB/cisco_anyconnect/NumInstalled

Vulnerability Information

Severity: High
Vulnerability Published: 2011-06-01
Patch Published: 2011-06-01
CVE [?]: CVE-2011-2039, CVE-2011-2041
CPE [?]: cpe:/a:cisco:anyconnect_secure_mobility_client

Synopsis

The VPN client installed on the remote Windows host has multiple vulnerabilities.

Description

The version of Cisco AnyConnect Secure Mobility Client installed on the remote host is earlier than 2.3.254 and may have the following vulnerabilities :

- When the client is obtained from the VPN headend using a web browser, a helper application performs the download and installation. This helper application does not verify the authenticity of the downloaded installer, which could allow an attacker to send malicious code to the user instead. Only versions prior to 2.3.185 are affected by this vulnerability. (CVE-2011-2039)

- Unprivileged users can elevate to LocalSystem privileges by enabling the Start Before Logon feature and performing unspecified actions with the Cisco AnyConnect Secure Mobility client interface in the Windows logon screen. (CVE-2011-2041)

Solution

Upgrade to version 2.3.254 or later.

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 Cisco AnyConnect Secure Mobility Client < 2.3.254 Multiple Vulnerabilities vulnerability:

Metasploit: exploit/windows/browser/cisco_anyconnect_exec
[Cisco AnyConnect VPN Client ActiveX URL Property Download and Execute]
Exploit-DB: exploits/windows/remote/17366.rb
[EDB-17366: Cisco AnyConnect VPN Client - ActiveX URL Property Download and Execute (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:N/AC:M/Au:N/C:C/I:C/A:C/E:F/RL:OF/RC:C

CVSS Base Score:	9.3 (High)
Impact Subscore:	10.0
Exploitability Subscore:	8.6
CVSS Temporal Score:	7.7 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	7.7 (High)

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Plugin Source

#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(54954);
  script_version("1.16");
  script_cvs_date("Date: 2018/11/15 20:50:26");

  script_cve_id("CVE-2011-2039", "CVE-2011-2041");
  script_bugtraq_id(48077, 48081);
  script_xref(name:"CISCO-BUG-ID", value:"CSCsy00904");
  script_xref(name:"CISCO-BUG-ID", value:"CSCta40556");
  script_xref(name:"CISCO-SA", value:"cisco-sa-20110601-ac");
  script_xref(name:"CERT", value:"490097");
  script_xref(name:"EDB-ID", value:"17366");

  script_name(english:"Cisco AnyConnect Secure Mobility Client < 2.3.254 Multiple Vulnerabilities");
  script_summary(english:"Does a version check");

  script_set_attribute(
    attribute:"synopsis",
    value:
"The VPN client installed on the remote Windows host has multiple
vulnerabilities."
  );
  script_set_attribute(
    attribute:"description",
    value:
"The version of Cisco AnyConnect Secure Mobility Client installed on
the remote host is earlier than 2.3.254 and may have the following
vulnerabilities :

  - When the client is obtained from the VPN headend using
    a web browser, a helper application performs the
    download and installation.  This helper application does
    not verify the authenticity of the downloaded installer,
    which could allow an attacker to send malicious code to
    the user instead.  Only versions prior to 2.3.185 are
    affected by this vulnerability. (CVE-2011-2039)

  - Unprivileged users can elevate to LocalSystem privileges
    by enabling the Start Before Logon feature and
    performing unspecified actions with the Cisco AnyConnect
    Secure Mobility client interface in the Windows logon
    screen. (CVE-2011-2041)"
  );
  # http://www.verisigninc.com/en_US/products-and-services/network-intelligence-availability/idefense/public-vulnerability-reports/articles/index.xhtml?id=909
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?6072ec79");
  # http://www.cisco.com/en/US/products/csa/cisco-sa-20110601-ac.html
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?07d085fe");
  script_set_attribute(attribute:"solution", value:"Upgrade to version 2.3.254 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/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:'Cisco AnyConnect VPN Client ActiveX URL Property Download and Execute');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2011/06/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2011/06/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2011/06/03");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:cisco:anyconnect_secure_mobility_client");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Windows");

  script_copyright(english:"This script is Copyright (C) 2011-2018 Tenable Network Security, Inc.");

  script_dependencies('cisco_anyconnect_vpn_installed.nasl');
  script_require_keys('SMB/cisco_anyconnect/NumInstalled');

  exit(0);
}

include('audit.inc');
include('global_settings.inc');
include('misc_func.inc');

appname = 'Cisco AnyConnect VPN Client';
kb_base = 'SMB/cisco_anyconnect/';
report = '';

num_installed = get_kb_item_or_exit(kb_base + 'NumInstalled');

for (install_num = 0; install_num < num_installed; install_num++)
{
  path = get_kb_item_or_exit(kb_base + install_num + '/path');
  ver = get_kb_item_or_exit(kb_base + install_num + '/version');
  fix = '2.3.254.0';

  if (ver =~ "^2\." && ver_compare(ver:ver, fix:fix) < 0)
  {
      report +=
        '\n  Path              : ' + path +
        '\n  Installed version : ' + ver +
        '\n  Fixed version     : ' + fix + '\n';
  }
}

if(report != '')
{
  port = get_kb_item('SMB/transport');
  if (!port) port = 445;

  if (report_verbosity > 0)
    security_hole(port:445, extra:report);
  else security_hole(port);
  exit(0);
}
else audit(AUDIT_INST_PATH_NOT_VULN, appname);

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

Linux / Unix:
/opt/nessus/lib/nessus/plugins/cisco_anyconnect_vpn_2_3_254.nasl
Windows:
C:\ProgramData\Tenable\Nessus\nessus\plugins\cisco_anyconnect_vpn_2_3_254.nasl
Mac OS X:
/Library/Nessus/run/lib/nessus/plugins/cisco_anyconnect_vpn_2_3_254.nasl

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How to Run

Here is how to run the Cisco AnyConnect Secure Mobility Client < 2.3.254 Multiple Vulnerabilities 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 Windows plugin family.
On the right side table select Cisco AnyConnect Secure Mobility Client < 2.3.254 Multiple Vulnerabilities plugin ID 54954.
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 cisco_anyconnect_vpn_2_3_254.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a cisco_anyconnect_vpn_2_3_254.nasl -t <IP/HOST>

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

/opt/nessus/bin/nasl -T - cisco_anyconnect_vpn_2_3_254.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 cisco_anyconnect_vpn_2_3_254.nasl -t <IP/HOST>

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References

BID | SecurityFocus Bugtraq ID:

48077, 48081

CERT | Computer Emergency Response Team:

490097

Cisco Bug ID:

CSCsy00904, CSCta40556

Cisco Security Advisory:

cisco-sa-20110601-ac

See also:

Similar and related Nessus plugins:

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Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file cisco_anyconnect_vpn_2_3_254.nasl version 1.16. For more plugins, visit the Nessus Plugin Library.

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Cisco AnyConnect Secure Mobility Client < 2.3.254 Multiple Vulnerabilities - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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