Cisco WebEx for Internet Explorer RCE (cisco-sa-20170124-webex) - Nessus

High Plugin ID: 96908

This page contains detailed information about the Cisco WebEx for Internet Explorer RCE (cisco-sa-20170124-webex) 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: 96908
Name: Cisco WebEx for Internet Explorer RCE (cisco-sa-20170124-webex)
Filename: cisco_webex_extension_rce_ie.nasl
Vulnerability Published: 2017-01-23
This Plugin Published: 2017-01-31
Last Modification Time: 2018-07-06
Plugin Version: 1.8
Plugin Type: local
Plugin Family: Windows
Dependencies: smb_hotfixes.nasl
Required KB Items [?]: SMB/Registry/Enumerated

Vulnerability Information

Severity: High
Vulnerability Published: 2017-01-23
Patch Published: 2017-01-28
CVE [?]: CVE-2017-3823
CPE [?]: cpe:/a:cisco:webex, cpe:/a:microsoft:ie
Exploited by Malware: True
In the News: True

Synopsis

A browser extension installed on the remote host is affected by a remote code execution vulnerability.

Description

The Cisco WebEx Extension for Internet Explorer installed on the remote host is affected by a remote code execution vulnerability due to a crafted pattern that permits any URL utilizing it to automatically use native messaging to access sensitive functionality provided by the extension. An unauthenticated, remote attacker can exploit this vulnerability to execute arbitrary code by convincing a user to visit a web page that contains this pattern and starting a WebEx session.

Solution

Upgrade to Cisco WebEx Extension version 2.1.0.10 or later.

Public Exploits

Target Network Port(s): 139, 445
Target Asset(s): N/A
Exploit Available: True (Metasploit Framework)
Exploit Ease: Exploits are available

Here's the list of publicly known exploits and PoCs for verifying the Cisco WebEx for Internet Explorer RCE (cisco-sa-20170124-webex) vulnerability:

Metasploit: exploit/windows/browser/cisco_webex_ext
[Cisco WebEx Chrome Extension RCE (CVE-2017-3823)]

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.

Risk Information

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

CVSS Base Score:	9.3 (High)
Impact Subscore:	10.0
Exploitability Subscore:	8.6
CVSS Temporal Score:	8.1 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	8.1 (High)

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

CVSS Base Score:	8.8 (High)
Impact Subscore:	5.9
Exploitability Subscore:	2.8
CVSS Temporal Score:	8.4 (High)
CVSS Environmental Score:	NA (None)
Modified Impact Subscore:	NA
Overall CVSS Score:	8.4 (High)

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Plugin Source

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

include("compat.inc");

if (description)
{
  script_id(96908);
  script_version("1.8");
  script_cvs_date("Date: 2018/07/06 11:26:08");

  script_cve_id("CVE-2017-3823");
  script_bugtraq_id(95737);
  script_xref(name:"CISCO-SA", value:"cisco-sa-20170124-webex");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvc86959");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvc88194");
  script_xref(name:"CISCO-BUG-ID", value:"CSCvc88535");
  script_xref(name:"CERT", value:"909240");

  script_name(english:"Cisco WebEx for Internet Explorer RCE (cisco-sa-20170124-webex)");
  script_summary(english:"Checks the extension version.");

  script_set_attribute(attribute:"synopsis", value:
"A browser extension installed on the remote host is affected by a
remote code execution vulnerability.");
  script_set_attribute(attribute:"description", value:
"The Cisco WebEx Extension for Internet Explorer installed on the
remote host is affected by a remote code execution vulnerability due
to a crafted pattern that permits any URL utilizing it to
automatically use native messaging to access sensitive functionality
provided by the extension. An unauthenticated, remote attacker can
exploit this vulnerability to execute arbitrary code by convincing a
user to visit a web page that contains this pattern and starting a
WebEx session.");
  # https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170124-webex
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?068aee48");
  script_set_attribute(attribute:"see_also", value:"https://bugs.chromium.org/p/project-zero/issues/detail?id=1096");
  script_set_attribute(attribute:"see_also", value:"https://bugs.chromium.org/p/project-zero/issues/detail?id=1100"); 
  script_set_attribute(attribute:"solution", value:
"Upgrade to Cisco WebEx Extension version 2.1.0.10 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:H/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:H/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:"exploited_by_malware", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Cisco WebEx Chrome Extension RCE (CVE-2017-3823)');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/01/23");
  script_set_attribute(attribute:"patch_publication_date", value:"2017/01/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2017/01/31");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:ie");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:cisco:webex");
  script_set_attribute(attribute:"in_the_news", value:"true");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2017-2018 Tenable Network Security, Inc.");

  script_dependencies("smb_hotfixes.nasl");
  script_require_keys("SMB/Registry/Enumerated");
  script_require_ports(139, 445);

  exit(0);
}

include("audit.inc");
include("misc_func.inc");
include("smb_func.inc");
include("smb_hotfixes.inc");
include("smb_reg_query.inc");
include("smb_hotfixes_fcheck.inc");
include("global_settings.inc");

report = "";
ver = NULL;
fix = "2.1.0.10";

registry_init();
hklm = registry_hive_connect(hive:HKEY_LOCAL_MACHINE, exit_on_fail:TRUE);

key = "SOFTWARE\ActiveTouch\Deinstall\NS_Unknown\WebEx\T30_MC\ieatgpc.dll";

path = get_registry_value(handle:hklm, item:key);
RegCloseKey(handle:hklm);
close_registry(close:TRUE);

hotfix_check_fversion_init();

if(!empty_or_null(path))
{
  ver = hotfix_get_fversion(path:path);
}
else
{
  path = hotfix_get_systemroot();
  path = path + "\Downloaded Program Files\ieatgpc.dll";
  ver = hotfix_get_fversion(path:path);
}

hotfix_check_fversion_end();

error = hotfix_handle_error(error_code:ver['error'], file:path, exit_on_fail:TRUE);

ver = ver['value'];
ver = split(ver, sep:",", keep:false);
ver = join(ver, sep:".");

if(ver_compare(ver:ver, fix:fix, strict:FALSE) < 0)
{
  port =  kb_smb_transport();
  if (!port) port = 445;

  report += '\n' +
            'One or more users have a vulnerable version of the Cisco WebEx Extension for Internet Explorer installed: ' +
            '\n' +
            '\n  Installed version : ' + ver +
            '\n  Fixed Version     : ' + fix +
            '\n  Path              : ' + path +
            '\n';
  security_report_v4(severity:SECURITY_HOLE, port:port, extra:report);
}
else audit(AUDIT_INST_VER_NOT_VULN, "Cisco WebEx Extension for Internet Explorer");

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

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

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How to Run

Here is how to run the Cisco WebEx for Internet Explorer RCE (cisco-sa-20170124-webex) 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 WebEx for Internet Explorer RCE (cisco-sa-20170124-webex) plugin ID 96908.
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_webex_extension_rce_ie.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

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

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

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

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References

BID | SecurityFocus Bugtraq ID:

95737

CERT | Computer Emergency Response Team:

909240

Cisco Bug ID:

CSCvc86959, CSCvc88194, CSCvc88535

Cisco Security Advisory:

cisco-sa-20170124-webex

See also:

Similar and related Nessus plugins:

96907 - Cisco WebEx for Firefox RCE (cisco-sa-20170124-webex)
96772 - Cisco WebEx Extension for Chrome RCE (cisco-sa-20170124-webex)
76491 - Cisco AnyConnect Secure Mobility Client 2.x / 3.x < 3.1(5170) Multiple OpenSSL Vulnerabilities
78676 - Cisco AnyConnect Secure Mobility Client < 3.1(5187) (POODLE)
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97226 - Cisco AnyConnect Secure Mobility Client 4.0.x < 4.3.05017 / 4.4.x < 4.4.00243 SBL Module Privilege Escalation
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150807 - Cisco AnyConnect Secure Mobility Client for Windows Denial of Service Vulnerability (cisco-sa-anyconnect-dos-hMhyDfb8)
139543 - Cisco AnyConnect Secure Mobility Client for Windows Profile Modification (cisco-sa-anyconnect-profile-7u3PERKF)
139575 - Cisco Webex Meetings User Email Address Information Disclosure (cisco-sa-webex-mAkmV4qc)
88593 - Cisco Security Manager 4.9.x < 4.9(0.397) / 4.10.x < 4.10(0.189) OpenSSL ASN.1 Signature Handling DoS
42960 - Cisco VPN Client on Windows Service Control Manager DoS
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Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file cisco_webex_extension_rce_ie.nasl version 1.8. For more plugins, visit the Nessus Plugin Library.

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Cisco WebEx for Internet Explorer RCE (cisco-sa-20170124-webex) - Nessus

Plugin Overview

Vulnerability Information

Synopsis

Description

Solution

Public Exploits

Risk Information

Plugin Source

How to Run

References

Version

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