Siemens InsydeH2O Improper Input Validation (CVE-2020-5956)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(501725);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/09/27");

  script_cve_id("CVE-2020-5956");

  script_name(english:"Siemens InsydeH2O Improper Input Validation (CVE-2020-5956)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"An issue was discovered in SdLegacySmm in Insyde InsydeH2O with kernel
5.1 before 05.15.11, 5.2 before 05.25.11, 5.3 before 05.34.11, and 5.4
before 05.42.11. The software SMI handler allows untrusted external
input because it does not verify CommBuffer.

Insyde BIOS is typically used in RUGGEDCOM APE products 
and some SIMATIC devices. Please refer to the vendor advisory for a 
precise list of models concerned.

This plugin only works with Tenable.ot
Please visit https://www.tenable.com/products/tenable-ot for more information.");
  script_set_attribute(attribute:"see_also", value:"https://www.insyde.com/security-pledge");
  script_set_attribute(attribute:"see_also", value:"https://security.netapp.com/advisory/ntap-20220223-0001/");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/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:N/S:U/C:N/I:H/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-2020-5956");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(20);

  script_set_attribute(attribute:"vuln_publication_date", value:"2022/01/05");
  script_set_attribute(attribute:"patch_publication_date", value:"2022/01/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/09/26");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:insyde:insydeh2o:5.1");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:insyde:insydeh2o:5.2");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:insyde:insydeh2o:5.3");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:insyde:insydeh2o:5.4");
  script_set_attribute(attribute:"generated_plugin", value:"former");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Tenable.ot");

  script_copyright(english:"This script is Copyright (C) 2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("tenable_ot_api_integration.nasl");
  script_require_keys("Tenable.ot/Siemens");

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/Siemens');

var asset = tenable_ot::assets::get(vendor:'Siemens');

var vuln_cpes = {
    "cpe:/a:insyde:insydeh2o:5.2" :
        {"versionEndExcluding" : "5.25.11", "versionStartIncluding" : "5.2", "family" : "APE1808"},
    "cpe:/a:insyde:insydeh2o:5.1" :
        {"versionEndExcluding" : "5.15.11", "versionStartIncluding" : "5.1", "family" : "APE1808"},
    "cpe:/a:insyde:insydeh2o:5.3" :
        {"versionEndExcluding" : "5.34.11", "versionStartIncluding" : "5.3", "family" : "APE1808"},
    "cpe:/a:insyde:insydeh2o:5.4" :
        {"versionEndExcluding" : "5.42.11", "versionStartIncluding" : "5.4", "family" : "APE1808"}
};

tenable_ot::cve::compare_and_report(asset:asset, cpes:vuln_cpes, severity:SECURITY_WARNING);