SAP NetWeaver AS Missing Authorization Check (September 2021)

#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
##

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(153441);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/09/24");

  script_cve_id("CVE-2021-37535");
  script_xref(name:"IAVA", value:"2021-A-0413");

  script_name(english:"SAP NetWeaver AS Missing Authorization Check (September 2021)");

  script_set_attribute(attribute:"synopsis", value:
"The remote SAP NetWeaver server is missing an authorization check.");
  script_set_attribute(attribute:"description", value:
"The version of SAP NetWeaver AS installed on the remote host may not perform necessary authorization checks for user
privileges, and this can be exploited by a remote, unauthenticated attacker.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://wiki.scn.sap.com/wiki/pages/viewpage.action?pageId=585106405
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9263345b");
  script_set_attribute(attribute:"see_also", value:"https://launchpad.support.sap.com/#/notes/3078609");
  script_set_attribute(attribute:"solution", value:
"Apply the appropriate patch according to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-37535");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/09/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/09/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/09/16");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:sap:netweaver_application_server");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Web Servers");

  script_copyright(english:"This script is Copyright (C) 2021 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("sap_netweaver_as_web_detect.nbin");
  script_require_keys("installed_sw/SAP Netweaver Application Server (AS)", "Settings/ParanoidReport");
  script_require_ports("Services/www", 80, 443, 8000, 50000);

  exit(0);
}

include('vcf_extras_sap.inc');

if (report_paranoia < 2)
  audit(AUDIT_PARANOID);

var app_info = vcf::sap_netweaver_as::get_app_info();

var fix = 'See vendor advisory';

var constraints = [
    {'equal' : '7.11', 'fixed_display' : fix },
    {'equal' : '7.20', 'fixed_display' : fix },
    {'equal' : '7.30', 'fixed_display' : fix },
    {'equal' : '7.31', 'fixed_display' : fix },
    {'equal' : '7.40', 'fixed_display' : fix },
    {'equal' : '7.50', 'fixed_display' : fix }
  ];

vcf::sap_netweaver_as::check_version_and_report(
  app_info:app_info,
  constraints:constraints,
  severity:SECURITY_HOLE
);