Bosch Security Systems (CVE-2021-23845)

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

include('compat.inc');

if (description)
{
  script_id(501996);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/19");

  script_cve_id("CVE-2021-23845");

  script_name(english:"Bosch Security Systems (CVE-2021-23845)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"This vulnerability could allow an attacker to hijack a session while a
user is logged in the configuration web page. This vulnerability was
discovered by a security researcher in B426 and found during internal
product tests in B426-CN/B429-CN, and B426-M and has been fixed
already starting from version 3.08 on, which was released on June
2019.

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://psirt.bosch.com/security-advisories/bosch-sa-196933-bt.html");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-23845");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(284);

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/06/18");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/06/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2024/02/14");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:bosch:b426-cn_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:bosch:b426-m_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:bosch:b426_firmware");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2024-2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/BoschSecuritySystems');

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

var vuln_cpes = {
    "cpe:/o:bosch:b426_firmware" :
        {"versionEndExcluding" : "03.08", "family" : "B426"},
    "cpe:/o:bosch:b426-cn_firmware" :
        {"versionEndExcluding" : "03.08", "family" : "B426"},
    "cpe:/o:bosch:b426-m_firmware" :
        {"versionEndExcluding" : "03.10", "family" : "B426"}
};

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