Cisco Web Security Appliance Drop Decrypt Policy Bypass Vulnerability

2016-12-08T00:00:00
ID OPENVAS:1361412562310106456
Type openvas
Reporter This script is Copyright (C) 2016 Greenbone Networks GmbH
Modified 2017-10-16T00:00:00

Description

A vulnerability in the Decrypt for End-User Notification configuration parameter of Cisco AsyncOS Software for Cisco Web Security Appliances could allow an unauthenticated, remote attacker to connect to a secure website over Secure Sockets Layer (SSL) or Transport Layer Security (TLS), even if the WSA is configured to block connections to the website.

                                        
                                            ###############################################################################
# OpenVAS Vulnerability Test
# $Id: gb_cisco_wsa_cisco-sa-20161207-wsa1.nasl 7442 2017-10-16 09:45:56Z ckuersteiner $
#
# Cisco Web Security Appliance Drop Decrypt Policy Bypass Vulnerability
#
# Authors:
# Christian Kuersteiner <christian.kuersteiner@greenbone.net>
#
# Copyright:
# Copyright (c) 2016 Greenbone Networks GmbH
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
###############################################################################

CPE = "cpe:/h:cisco:web_security_appliance";

if (description)
{
 script_oid("1.3.6.1.4.1.25623.1.0.106456");
 script_cve_id("CVE-2016-9212");
 script_tag(name:"cvss_base", value:"5.0");
 script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:P/A:N");
 script_version ("$Revision: 7442 $");

 script_name("Cisco Web Security Appliance Drop Decrypt Policy Bypass Vulnerability");

 script_xref(name:"URL", value: "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20161207-wsa1");

 script_tag(name: "vuldetect" , value:"Check the version.");

 script_tag(name: "solution" , value:"See the referenced vendor advisory for a solution.");

 script_tag(name: "summary" , value:"A vulnerability in the Decrypt for End-User Notification configuration
parameter of Cisco AsyncOS Software for Cisco Web Security Appliances could allow an unauthenticated, remote
attacker to connect to a secure website over Secure Sockets Layer (SSL) or Transport Layer Security (TLS), even
if the WSA is configured to block connections to the website.");

 script_tag(name: "insight", value: "The vulnerability is due to incomplete input validation of HTTP headers. An
attacker could exploit this vulnerability by sending a crafted HTTP request through an affected device.");

 script_tag(name: "impact", value: "A successful exploit could allow the attacker to connect to a website that
should be blocked.");

 script_tag(name:"qod_type", value:"package");
 script_tag(name:"solution_type", value:"VendorFix");

 script_tag(name:"last_modification", value:"$Date: 2017-10-16 11:45:56 +0200 (Mon, 16 Oct 2017) $");
 script_tag(name:"creation_date", value:"2016-12-08 11:24:12 +0700 (Thu, 08 Dec 2016)");
 script_category(ACT_GATHER_INFO);
 script_family("CISCO");
 script_copyright("This script is Copyright (C) 2016 Greenbone Networks GmbH");
 script_dependencies("gb_cisco_wsa_version.nasl");
 script_mandatory_keys("cisco_wsa/installed");
 exit(0);
}

include("host_details.inc");
include("version_func.inc");

if( ! version = get_app_version( cpe:CPE ) ) exit( 0 );

affected = make_list( 
		'9.0.1-162',
		'9.1.1-074',
		'9.1.2-039',
		'10.1.1-235',
		'10.5.1-296',
		'11.0.0-641' );

foreach af ( affected )
{
  if( version == af )
  {
    report = report_fixed_ver(  installed_version:version, fixed_version: "See advisory" );
    security_message( port:0, data:report );
    exit( 0 );
  }
}

exit( 99 );