Cisco Adaptive Security Appliance Software DHCPv6 Relay Denial of Service Vulnerability (cisco-sa-20160420-asa-dhcpv6)

# Copyright (C) 2016 Greenbone Networks GmbH
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-or-later
#
# 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:/a:cisco:asa";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.106072");
  script_version("2022-02-10T15:02:13+0000");
  script_tag(name:"last_modification", value:"2022-02-10 15:02:13 +0000 (Thu, 10 Feb 2022)");
  script_tag(name:"creation_date", value:"2016-05-12 12:19:00 +0700 (Thu, 12 May 2016)");
  script_tag(name:"cvss_base", value:"7.8");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:C");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2016-12-03 03:20:00 +0000 (Sat, 03 Dec 2016)");

  script_cve_id("CVE-2016-1367");

  script_tag(name:"qod_type", value:"remote_banner");

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

  script_name("Cisco Adaptive Security Appliance Software DHCPv6 Relay Denial of Service Vulnerability (cisco-sa-20160420-asa-dhcpv6)");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2016 Greenbone Networks GmbH");
  script_family("CISCO");
  script_dependencies("gb_cisco_asa_version.nasl", "gb_cisco_asa_version_snmp.nasl");
  script_mandatory_keys("cisco_asa/version");

  script_tag(name:"summary", value:"A vulnerability in the DHCPv6 relay feature of Cisco Adaptive
  Security Appliance (ASA) Software could allow an unauthenticated, remote attacker to cause an
  affected device to reload.");

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

  script_tag(name:"insight", value:"The vulnerability is due to insufficient validation of DHCPv6
  packets. An attacker could exploit this vulnerability by sending crafted DHCPv6 packets to an
  affected device, resulting in a denial of service (DoS) condition.

  This vulnerability affects systems configured in routed firewall mode and in single or multiple
  context mode. Cisco ASA Software is affected by this vulnerability only if the software is
  configured with the DHCPv6 relay feature. The vulnerability is triggered only by IPv6 traffic.");

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

  script_xref(name:"URL", value:"http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160420-asa-dhcpv6");

  exit(0);
}

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

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

check_vers = ereg_replace( pattern:"(\(|\))", string:version, replace:"." );
check_vers = ereg_replace( pattern:"\.$", string:check_vers, replace:"" );

affected = make_list(
  '9.4.1' );

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

exit( 99 );