OpenSSL Alternative Chains Certificate Forgery Vulnerability (July 2015) Affecting Cisco Products

2016-05-10T00:00:00
ID OPENVAS:1361412562310105682
Type openvas
Reporter This script is Copyright (C) 2016 Greenbone Networks GmbH
Modified 2019-10-09T00:00:00

Description

On July 9, 2015, the OpenSSL Project released a security advisory detailing a vulnerability affecting applications that verify certificates, including SSL/Transport Layer Security (TLS)/Datagram Transport Layer Security (DTLS) clients and SSL/TLS/DTLS servers using client authentication.

Multiple Cisco products incorporate a version of the OpenSSL package affected by this vulnerability that could allow an unauthenticated, remote attacker to cause certain checks on untrusted certificates to be bypassed, enabling the attacker to forge trusted certificates that could be used to conduct man-in-the-middle attacks.

Cisco will release free software updates that address this vulnerability.

Workarounds that mitigate this vulnerability may be available.

                                        
                                            ###############################################################################
# OpenVAS Vulnerability Test
#
# OpenSSL Alternative Chains Certificate Forgery Vulnerability (July 2015) Affecting Cisco Products
#
# Authors:
# Michael Meyer <michael.meyer@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:/o:cisco:ios_xe";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.105682");
  script_cve_id("CVE-2015-1793");
  script_tag(name:"cvss_base", value:"6.4");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:N");
  script_version("2019-10-09T06:43:33+0000");

  script_name("OpenSSL Alternative Chains Certificate Forgery Vulnerability (July 2015) Affecting Cisco Products");

  script_xref(name:"URL", value:"http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20150710-openssl");
  script_xref(name:"URL", value:"http://tools.cisco.com/security/center/viewAlert.x?alertId=39851");

  script_tag(name:"vuldetect", value:"Checks if a vulnerable version is present on the target host.");

  script_tag(name:"solution", value:"See the referenced vendor advisory for a solution.");
  script_tag(name:"summary", value:"On July 9, 2015, the OpenSSL Project released a security advisory detailing
  a vulnerability affecting applications that verify certificates, including SSL/Transport Layer Security
  (TLS)/Datagram Transport Layer Security (DTLS) clients and SSL/TLS/DTLS servers using client authentication.

  Multiple Cisco products incorporate a version of the OpenSSL package affected by this vulnerability that could
  allow an unauthenticated, remote attacker to cause certain checks on untrusted certificates to be bypassed,
  enabling the attacker to forge `trusted` certificates that could be used to conduct man-in-the-middle attacks.

  Cisco will release free software updates that address this vulnerability.

  Workarounds that mitigate this vulnerability may be available.");

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

  script_tag(name:"last_modification", value:"2019-10-09 06:43:33 +0000 (Wed, 09 Oct 2019)");
  script_tag(name:"creation_date", value:"2016-05-10 10:59:16 +0200 (Tue, 10 May 2016)");
  script_category(ACT_GATHER_INFO);
  script_family("CISCO");
  script_copyright("This script is Copyright (C) 2016 Greenbone Networks GmbH");
  script_dependencies("gb_cisco_ios_xe_version.nasl");
  script_mandatory_keys("cisco_ios_xe/version");
  exit(0);
}

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

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

affected = make_list(
  '3.3.0S',
  '3.3.1S',
  '3.3.2S',
  '3.4.0S',
  '3.4.1S',
  '3.4.2S',
  '3.4.3S',
  '3.4.4S',
  '3.4.5S',
  '3.4.6S',
  '3.5.0S',
  '3.5.1S',
  '3.5.2S',
  '3.6.0S',
  '3.6.1S',
  '3.6.2S',
  '3.7.0S',
  '3.7.1S',
  '3.7.2S',
  '3.7.3S',
  '3.7.4S',
  '3.7.5S',
  '3.7.6S',
  '3.8.0S',
  '3.8.1S',
  '3.8.2S',
  '3.9.0S',
  '3.9.1S',
  '3.9.2S' );

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 );