MikroTik RouterOS 'L2TP' Man-in-the-Middle Attack Vulnerability

# SPDX-FileCopyrightText: 2017 Greenbone AG
# 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-only

CPE = "cpe:/o:mikrotik:routeros";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.810609");
  script_version("2023-07-14T16:09:27+0000");
  script_cve_id("CVE-2017-6297");
  script_tag(name:"cvss_base", value:"4.3");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:M/Au:N/C:P/I:N/A:N");
  script_tag(name:"last_modification", value:"2023-07-14 16:09:27 +0000 (Fri, 14 Jul 2023)");
  script_tag(name:"severity_vector", value:"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N");
  script_tag(name:"severity_origin", value:"NVD");
  script_tag(name:"severity_date", value:"2019-10-03 00:03:00 +0000 (Thu, 03 Oct 2019)");
  script_tag(name:"creation_date", value:"2017-03-09 16:21:26 +0530 (Thu, 09 Mar 2017)");
  script_tag(name:"qod_type", value:"remote_banner");
  script_name("MikroTik RouterOS 'L2TP' Man-in-the-Middle Attack Vulnerability");

  script_tag(name:"summary", value:"MikroTik router is prone to a man in the middle attack vulnerability.");

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

  script_tag(name:"insight", value:"The flaw exists due to an error in the L2TP
  client which does not enable IPsec encryption after a reboot.");

  script_tag(name:"impact", value:"Successful exploitation will allow remote
  attackers to view unencrypted transmitted data and gain access to networks on
  the L2TP server by monitoring the packets for the transmitted data and
  obtaining the L2TP secret.");

  script_tag(name:"affected", value:"MikroTik RouterOS versions 6.83.3 and
  6.37.4");

  script_tag(name:"solution", value:"Update to version 6.37.5, 6.83.4 or later.");

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

  script_xref(name:"URL", value:"https://blog.milne.it/2017/02/24/mikrotik-routeros-security-vulnerability-l2tp-tunnel-unencrypted-cve-2017-6297");
  script_xref(name:"URL", value:"http://www.securityfocus.com/bid/96447");
  script_xref(name:"URL", value:"https://mikrotik.com/download/changelogs/");

  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2017 Greenbone AG");
  script_family("General");
  script_dependencies("gb_mikrotik_router_routeros_consolidation.nasl");
  script_mandatory_keys("mikrotik/detected");

  exit(0);
}

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

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

if( version =~ "^6\.") {
  if( version_is_equal( version:version, test_version:"6.83.3" ) ||
      version_is_equal( version:version, test_version:"6.37.4" ) ) {
    report = report_fixed_ver( installed_version:version, fixed_version:"6.37.5, 6.83.4 or later");
    security_message( port:0, data:report );
    exit( 0 );
  }
}

exit( 99 );