SAP NetWeaver AS ABAP Memory Corruption (July 2021)

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

include('deprecated_nasl_level.inc');

include('compat.inc');

if (description)
{
  script_id(152120);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/07/30");

  script_cve_id("CVE-2021-33684");

  script_name(english:"SAP NetWeaver AS ABAP Memory Corruption (July 2021)");

  script_set_attribute(attribute:"synopsis", value:
"The remote SAP NetWeaver server is affected by a Memory Corruption vulnerability.");
  script_set_attribute(attribute:"description", value:
"A memory corruption vulnerability exists in SAP NetWeaver AS ABAP due to buffer overflow from RFC Requests. An 
unauthenticated, remote attacker can exploit this by sending overlong content, crashing the corresponding work process.

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=580617506
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?39f0ff28");
  script_set_attribute(attribute:"see_also", value:"https://launchpad.support.sap.com/#/notes/3032624");
  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:N/I:N/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:N/I:N/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-33684");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/07/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/07/14");
  script_set_attribute(attribute:"plugin_publication_date", value:"2021/07/28");

  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_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';

  # Per the official download page, https://support.sap.com/en/my-support/software-downloads/support-package-stacks/product-versions.html
  # 7.21 = 721, with the second number being the standard for abap. The person writing the advisory just forgot to convert the numbers.
var constraints = [ 
    {'equal' : '721', 'fixed_display' : fix },
    {'equal' : '722', 'fixed_display' : fix },
    {'equal' : '749', 'fixed_display' : fix },
    {'equal' : '753', 'fixed_display' : fix },
    {'equal' : '777', 'fixed_display' : fix },
    {'equal' : '781', 'fixed_display' : fix },
    {'equal' : '784', 'fixed_display' : fix },
    {'equal' : '804', 'fixed_display' : fix }
  ];

vcf::sap_netweaver_as::check_version_and_report(
  app_info:app_info, 
  constraints:constraints, 
  severity:SECURITY_WARNING, 
  abap:TRUE
);