SAP NetWeaver AS JAVA Reverse Tabnabbing (2976947)

##
# (C) Tenable Network Security, Inc.
##

include('compat.inc');

if (description)
{
  script_id(147961);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/06/03");

  script_cve_id("CVE-2021-21491");
  script_xref(name:"IAVA", value:"2021-A-0138-S");

  script_name(english:"SAP NetWeaver AS JAVA Reverse Tabnabbing (2976947)");

  script_set_attribute(attribute:"synopsis", value:
"The remote SAP NetWeaver AS Java server may be affected by Reverse TabNabbing vulnerability");
  script_set_attribute(attribute:"description", value:
"SAP Netweaver Application Server Java (Applications based on WebDynpro Java) versions 7.00, 7.10, 7.11, 7.20, 7.30,
7.31, 7.40, 7.50, allow an attacker to redirect users to a malicious site due to Reverse Tabnabbing vulnerabilities.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://wiki.scn.sap.com/wiki/pages/viewpage.action?pageId=571343107");
  script_set_attribute(attribute:"see_also", value:"https://launchpad.support.sap.com/#/notes/2976947");
  script_set_attribute(attribute:"solution", value:
"Apply the appropriate patch according to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:N");
  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:R/S:C/C:L/I:L/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-21491");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/03/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/03/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/03/23");

  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('http.inc');
include('vcf.inc');

if (report_paranoia < 2) audit(AUDIT_PARANOID);

app = 'SAP Netweaver Application Server (AS)';

get_install_count(app_name:app, exit_if_zero:TRUE);

port = get_http_port(default:443);

app_info = vcf::get_app_info(app:app, port:port, webapp:TRUE);

constraints = [
  {'equal' : '7.00', 'fixed_display' : 'See vendor advisory' },
  {'min_version' : '7.10', 'max_version' : '7.11', 'fixed_display' : 'See vendor advisory' },
  {'equal' : '7.20', 'fixed_display' : 'See vendor advisory' },
  {'equal' : '7.30', 'fixed_display' : 'See vendor advisory' },
  {'equal' : '7.31', 'fixed_display' : 'See vendor advisory' },
  {'equal' : '7.40', 'fixed_display' : 'See vendor advisory' },
  {'equal' : '7.50', 'fixed_display' : 'See vendor advisory' }
];

vcf::check_version_and_report(app_info:app_info, constraints:constraints, severity:SECURITY_WARNING);