Cisco Nexus 7000 Series Switches Access-Control Filtering Mechanisms Bypass Vulnerability (cisco-sa-20170315-cns)

# Copyright (C) 2017 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:/o:cisco:nx-os";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.106655");
  script_version("2022-12-26T10:12:01+0000");
  script_tag(name:"last_modification", value:"2022-12-26 10:12:01 +0000 (Mon, 26 Dec 2022)");
  script_tag(name:"creation_date", value:"2017-03-16 10:48:42 +0700 (Thu, 16 Mar 2017)");
  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_tag(name:"severity_vector", value:"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2017-07-12 01:29:00 +0000 (Wed, 12 Jul 2017)");

  script_cve_id("CVE-2017-3875");

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

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

  script_name("Cisco Nexus 7000 Series Switches Access-Control Filtering Mechanisms Bypass Vulnerability (cisco-sa-20170315-cns)");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2017 Greenbone Networks GmbH");
  script_family("CISCO");
  script_dependencies("gb_cisco_nx_os_consolidation.nasl");
  script_mandatory_keys("cisco/nx_os/detected", "cisco/nx_os/device", "cisco/nx_os/model");

  script_tag(name:"summary", value:"A vulnerability in certain access-control filtering mechanisms
  on Cisco Nexus 7000 Series Switches could allow an unauthenticated, remote attacker to bypass
  defined traffic configured within an access control list (ACL) on the affected system.");

  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 the device failing to inspect
  specific traffic when other ACL checking mechanisms are in place. An attacker could exploit this
  vulnerability by issuing crafted commands for which a particular ACL would not match defined
  traffic.");

  script_tag(name:"impact", value:"An exploit could allow the attacker to bypass certain rulesets
  defined on a Network Time Protocol (NTP) ACL.");

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

  script_xref(name:"URL", value:"https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170315-cns");

  exit(0);
}

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

if (!device = get_kb_item("cisco/nx_os/device"))
  exit(0);

if ("Nexus" >!< device)
  exit(0);

if (!nx_model = get_kb_item("cisco/nx_os/model"))
  exit(0);

if (nx_model !~ "^C?7")
  exit(0);

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

affected = make_list(
  "5.2(4)",
  "6.1(3)S5",
  "6.1(3)S6",
  "6.2(1.121)S0",
  "7.2(1)D1(1)",
  "7.3(0)ZN(0.161)",
  "7.3(1)N1(0.1)");

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);