Cisco NX-OS Software-Based Products Authentication, Authorization, and Accounting Bypass Vulnerability (cisco-sa-20161005-nxaaa)

# 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:/o:cisco:nx-os";

if (description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.106339");
  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:"2016-10-06 11:51:06 +0700 (Thu, 06 Oct 2016)");
  script_tag(name:"cvss_base", value:"9.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:S/C:C/I:C/A:C");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2017-07-30 01:29:00 +0000 (Sun, 30 Jul 2017)");

  script_cve_id("CVE-2015-0721");

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

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

  script_name("Cisco NX-OS Software-Based Products Authentication, Authorization, and Accounting Bypass Vulnerability (cisco-sa-20161005-nxaaa)");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2016 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 the SSH subsystem of the Cisco Nexus family
  of products could allow an authenticated, remote attacker to bypass authentication,
  authorization, and accounting (AAA) restrictions.");

  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 improper processing of certain
  parameters that are passed to an affected device during the negotiation of an SSH connection. An
  attacker could exploit this vulnerability by authenticating to an affected device and passing a
  malicious value as part of the login procedure.");

  script_tag(name:"impact", value:"A successful exploit could allow an attacker to bypass AAA
  restrictions and execute commands on the device command-line interface (CLI) that should be
  restricted to a different privileged user role.");

  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-20161005-nxaaa");

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

if( "1000V" >< nx_model ) {
  affected = make_list(
    "4.0(4)SV1(1)",
    "4.0(4)SV1(2)",
    "4.0(4)SV1(3)",
    "4.0(4)SV1(3a)",
    "4.0(4)SV1(3b)",
    "4.0(4)SV1(3c)",
    "4.0(4)SV1(3d)",
    "4.2(1)SV1(4)",
    "4.2(1)SV1(4a)",
    "4.2(1)SV1(4b)",
    "4.2(1)SV1(5.1)",
    "4.2(1)SV1(5.1a)",
    "4.2(1)SV1(5.2)",
    "4.2(1)SV1(5.2b)",
    "4.2(1)SV2(1.1)",
    "4.2(1)SV2(1.1a)",
    "4.2(1)SV2(2.1)",
    "4.2(1)SV2(2.1a)"
  );
}

if( nx_model =~ "^C?3[0-9]+" ) {
  affected = make_list(
    "5.0(3)U1(1)",
    "5.0(3)U1(1a)",
    "5.0(3)U1(1b)",
    "5.0(3)U1(1d)",
    "5.0(3)U1(2)",
    "5.0(3)U1(2a)",
    "5.0(3)U2(1)",
    "5.0(3)U2(2)",
    "5.0(3)U2(2a)",
    "5.0(3)U2(2b)",
    "5.0(3)U2(2c)",
    "5.0(3)U2(2d)",
    "5.0(3)U3(1)",
    "5.0(3)U3(2)",
    "5.0(3)U3(2a)",
    "5.0(3)U3(2b)",
    "5.0(3)U4(1)",
    "5.0(3)U5(1)",
    "5.0(3)U5(1a)",
    "5.0(3)U5(1b)",
    "5.0(3)U5(1c)",
    "5.0(3)U5(1d)",
    "5.0(3)U5(1e)",
    "5.0(3)U5(1f)",
    "5.0(3)U5(1g)",
    "5.0(3)U5(1h)",
    "6.0(2)U1(1)",
    "6.0(2)U1(1a)",
    "6.0(2)U1(2)",
    "6.0(2)U1(3)",
    "6.0(2)U1(4)",
    "6.0(2)U2(1)",
    "6.0(2)U2(2)",
    "6.0(2)U2(3)",
    "6.0(2)U2(4)",
    "6.0(2)U2(5)",
    "6.0(2)U2(6)",
    "6.0(2)U3(1)",
    "6.0(2)U3(2)",
    "6.0(2)U3(3)",
    "6.0(2)U3(4)",
    "6.0(2)U3(5)",
    "6.0(2)U4(1)",
    "6.0(2)U4(2)",
    "6.0(2)U4(3)",
    "6.0(2)U5(1)"
  );
}

if( nx_model =~ "^C?4[0-9]+" ) {
  affected = make_list(
    "4.1(2)E1(1)",
    "4.1(2)E1(1b)",
    "4.1(2)E1(1d)",
    "4.1(2)E1(1e)",
    "4.1(2)E1(1f)",
    "4.1(2)E1(1g)",
    "4.1(2)E1(1h)",
    "4.1(2)E1(1i)",
    "4.1(2)E1(1j)"
  );
}

if( nx_model =~ "^C?5[0-9]+" ) {
  affected = make_list(
    "4.0(0)N1(1a)",
    "4.0(0)N1(2)",
    "4.0(0)N1(2a)",
    "4.0(1a)N1(1)",
    "4.0(1a)N1(1a)",
    "4.0(1a)N2(1)",
    "4.0(1a)N2(1a)",
    "4.1(3)N1(1)",
    "4.1(3)N1(1a)",
    "4.1(3)N2(1)",
    "4.1(3)N2(1a)",
    "4.2(1)N1(1)",
    "4.2(1)N2(1)",
    "4.2(1)N2(1a)",
    "5.0(2)N1(1)",
    "5.0(2)N2(1)",
    "5.0(2)N2(1a)",
    "5.0(3)N1(1c)",
    "5.0(3)N2(1)",
    "5.0(3)N2(2)",
    "5.0(3)N2(2a)",
    "5.0(3)N2(2b)",
    "5.1(3)N1(1)",
    "5.1(3)N1(1a)",
    "5.1(3)N2(1)",
    "5.1(3)N2(1a)",
    "5.1(3)N2(1b)",
    "5.1(3)N2(1c)",
    "5.2(1)N1(1)",
    "5.2(1)N1(1a)",
    "5.2(1)N1(1b)",
    "5.2(1)N1(2)",
    "5.2(1)N1(2a)",
    "5.2(1)N1(3)",
    "5.2(1)N1(4)",
    "5.2(1)N1(5)",
    "5.2(1)N1(6)",
    "5.2(1)N1(7)",
    "5.2(1)N1(8)",
    "5.2(1)N1(8a)",
    "6.0(2)N1(1)",
    "6.0(2)N1(2)",
    "6.0(2)N1(2a)",
    "6.0(2)N2(1)",
    "6.0(2)N2(1b)",
    "6.0(2)N2(2)",
    "6.0(2)N2(3)",
    "6.0(2)N2(4)",
    "6.0(2)N2(5)",
    "7.0(0)N1(1)",
    "7.0(1)N1(1)",
    "7.0(2)N1(1)",
    "7.0(3)N1(1)"
  );
}

if( nx_model =~ "^C?6[0-9]+" ) {
  affected = make_list(
    "6.0(2)N1(2)",
    "6.0(2)N1(2a)",
    "6.0(2)N2(1)",
    "6.0(2)N2(1b)",
    "6.0(2)N2(2)",
    "6.0(2)N2(3)",
    "6.0(2)N2(4)",
    "6.0(2)N2(5)",
    "7.0(0)N1(1)",
    "7.0(1)N1(1)",
    "7.0(2)N1(1)",
    "7.0(3)N1(1)"
  );
}

if( nx_model =~ "^C?7[0-9]+" ) {
  affected = make_list(
    "4.1.(2)",
    "4.1.(3)",
    "4.1.(4)",
    "4.1.(5)",
    "4.2(3)",
    "4.2(4)",
    "4.2(6)",
    "4.2(8)",
    "4.2.(2a)",
    "5.0(2a)",
    "5.0(3)",
    "5.0(5)",
    "5.1(1)",
    "5.1(1a)",
    "5.1(3)",
    "5.1(4)",
    "5.1(5)",
    "5.1(6)",
    "5.2(1)",
    "5.2(3a)",
    "5.2(4)",
    "5.2(5)",
    "5.2(7)",
    "5.2(9)",
    "6.0(1)",
    "6.0(2)",
    "6.0(3)",
    "6.0(4)",
    "6.1(1)",
    "6.1(2)",
    "6.1(3)",
    "6.1(4)",
    "6.1(4a)",
    "6.2(10)",
    "6.2(2)",
    "6.2(2a)",
    "6.2(6)",
    "6.2(6b)",
    "6.2(8)",
    "6.2(8a)",
    "6.2(8b)"
  );
}

if( nx_model =~ "^C?9[0-9]{3}" ) {
  affected = make_list(
    "11.0(1b)",
    "11.0(1c)",
    "6.1(2)I2(1)",
    "6.1(2)I2(2)",
    "6.1(2)I2(2a)",
    "6.1(2)I2(2b)",
    "6.1(2)I2(3)",
    "6.1(2)I3(1)",
    "6.1(2)I3(2)",
    "6.1(2)I3(3)"
  );
}

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 );