Cisco ASA DHCPv6 Relay DoS Vulnerability (cisco-sa-20150115-asa-dhcp)

# 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("1.3.6.1.4.1.25623.1.0.106053");
  script_version("2022-04-14T06:42:08+0000");
  script_tag(name:"last_modification", value:"2022-04-14 06:42:08 +0000 (Thu, 14 Apr 2022)");
  script_tag(name:"creation_date", value:"2015-11-25 11:40:51 +0700 (Wed, 25 Nov 2015)");
  script_tag(name:"cvss_base", value:"5.7");
  script_tag(name:"cvss_base_vector", value:"AV:A/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-2015-0578");

  script_name("Cisco ASA DHCPv6 Relay DoS Vulnerability (cisco-sa-20150115-asa-dhcp)");

  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 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. Only DHCPv6
  packets directed to the Cisco ASA interface where the DHCPv6 relay feature is enabled can be used
  to trigger this vulnerability.");

  script_tag(name:"impact", value:"An unauthenticated, remote attacker could cause the system to
  reload.");

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

  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-20150115-asa-dhcp");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/72718");

  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: "9.1.5.21")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "9.1(5.21)");
  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: "9.3.2")) {
  report = report_fixed_ver(installed_version: version, fixed_version: "9.3(2)");
  security_message(port: 0, data: report);
  exit(0);
}

exit(99);