Cisco ASA DHCPv6 Relay DoS Vulnerability (cisco-sa-20151021-asa-dhcp1)

# Copyright (C) 2015 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("1.3.6.1.4.1.25623.1.0.106050");
  script_version("2022-02-14T11:00:04+0000");
  script_tag(name:"last_modification", value:"2022-02-14 11:00:04 +0000 (Mon, 14 Feb 2022)");
  script_tag(name:"creation_date", value:"2015-11-25 11:40:51 +0700 (Wed, 25 Nov 2015)");
  script_tag(name:"cvss_base", value:"7.1");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:N/I:N/A:C");

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

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

  script_cve_id("CVE-2015-6324");

  script_name("Cisco ASA DHCPv6 Relay DoS Vulnerability (cisco-sa-20151021-asa-dhcp1)");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2015 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", "cisco_asa/model");

  script_tag(name:"summary", value:"A vulnerability in the DHCPv6 relay feature of Cisco ASA may
  lead to a denial of service.");

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

  script_tag(name:"insight", value:"A vulnerability in the DHCPv6 relay feature of Cisco ASA
  software could allow an unauthenticated, remote attacker to cause an affected device to reload.
  The vulnerability is due to insufficient validation of DHCPv6 packets. Cisco ASA Software is
  affected by this vulnerability only if the software is configured with the DHCPv6 relay feature.
  An attacker could exploit this vulnerability by sending crafted DHCPv6 packets to an affected
  device.");

  script_tag(name:"impact", value:"An unauthenticated, remote attacker could cause a device reload
  leading to a denial of service condition.");

  script_tag(name:"affected", value:"Version 9.0, 9.1, 9.2, 9.3 and 9.4 on Cisco ASA 5500 Series
  Adaptive Security Appliances, Cisco ASA 5500-X Series Next-Generation Firewalls, Cisco ASA
  Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers, Cisco ASA
  1000V Cloud Firewall and Cisco Adaptive Security Virtual Appliance (ASAv).");

  script_tag(name:"solution", value:"Apply the appropriate updates from Cisco. As a workaround
  disable the DHCPv6 relay feature.");

  script_xref(name:"URL", value:"http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151021-asa-dhcp1");

  exit(0);
}

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

model = get_kb_item("cisco_asa/model");
if (!model || (toupper(model) !~ "^ASAv" && toupper(model) !~ "^ASA55[0-9][0-9]"))
  exit(99);

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

if (version_in_range_exclusive(version: version, test_version_lo: "9.0", test_version_up: "9.0.4.37")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "9.0(4.37)");
  security_message(port: 0, data: report);
  exit(0);
}

if (version_in_range_exclusive(version: version, test_version_lo: "9.1", test_version_up: "9.1.6.6")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "9.1(6.6)");
  security_message(port: 0, data: report);
  exit(0);
}

if (version_in_range_exclusive(version: version, test_version_lo: "9.2", test_version_up: "9.2.4")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "9.2(4)");
  security_message(port: 0, data: report);
  exit(0);
}

if (version_in_range_exclusive(version: version, test_version_lo: "9.3", test_version_up: "9.3.3.6")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "9.3(3.6)");
  security_message(port: 0, data: report);
  exit(0);
}

if (version_in_range_exclusive(version: version, test_version_lo: "9.4", test_version_up: "9.4.2")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "9.4(2)");
  security_message(port: 0, data: report);
  exit(0);
}

exit(99);