Westermo WeOS Cryptographic Issues (CVE-2015-7923)

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

include('compat.inc');

if (description)
{
  script_id(502176);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/04/03");

  script_cve_id("CVE-2015-7923");

  script_name(english:"Westermo WeOS Cryptographic Issues (CVE-2015-7923)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"Westermo WeOS before 4.19.0 uses the same SSL private key across
different customers' installations, which makes it easier for man-in-
the-middle attackers to defeat cryptographic protection mechanisms by
leveraging knowledge of a key.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.");
  # https://www.westermo.com/us/-/media/Files/Cyber-security/westermo_sa_weos_15-06-v2.pdf
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c768c588");
  script_set_attribute(attribute:"see_also", value:"https://ics-cert.us-cert.gov/advisories/ICSA-16-028-01");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/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-2015-7923");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2016/01/30");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/01/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/04/03");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:westermo:weos");
  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) 2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/Westermo');

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

var vuln_cpes = {
    "cpe:/o:westermo:weos" :
        {"versionStartIncluding" : "4.2.0", "versionEndExcluding" : "4.19.0", "family" : "WestermoLynx"}
};

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