Trane Symbio Improper Control of Generation of Code (CVE-2021-38448)

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

include('compat.inc');

if (description)
{
  script_id(501740);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2024/04/11");

  script_cve_id("CVE-2021-38448");

  script_name(english:"Trane Symbio Improper Control of Generation of Code (CVE-2021-38448)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"The affected controllers do not properly sanitize the input containing
code syntax. As a result, an attacker could craft code to alter the
intended controller flow of the software.

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://us-cert.cisa.gov/ics/advisories/icsa-21-266-01");
  script_set_attribute(attribute:"solution", value:
"The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original
can be found at CISA.gov.

Affected users should contact a Trane office to make arrangements to install updated firmware or to request additional
information. Please reference Trane service database number HUB-205962 when contacting Trane. Trane recommends the
applications below be updated to the versions listed below.

Symbio 700:

- Odyssey Split Systems: All versions prior to v1.00.0023

Symbio 800:

- IntelliPak Rooftop Air Conditioner: All versions prior to v1.30.0008
- Ascend Air-cooled Chiller Model ACR: All versions prior to v1.10.0010
- Agility Water-Cooled Chiller Model HDWA: All versions prior to v1.00.0010

In addition to the specific recommendations above, Trane continues to recommend the following best practices as an
additional protection against this and other controller vulnerabilities:

- Restrict physical controller access to trained and trusted personnel.
- Use secure remote access solutions, such as Trane Connect Remote Access, when needed.
- Ensure user credentials are not shared and follow best practices for appropriate complexity (e.g., strong passwords).
- Have a well-documented process and owner to ensure regular software/firmware updates and keep systems up to date.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:P/AC:L/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-2021-38448");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(94);

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/11/22");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/11/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/09/27");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:trane:symbio_700");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:trane:symbio_800");
  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) 2023-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/Trane');

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

var vuln_cpes = {
    "cpe:/a:trane:symbio_700" :
        {"versionEndExcluding" : "1.00.0023", "family" : "Symbio"},
    "cpe:/a:trane:symbio_800" :
        {"versionEndExcluding" : "1.30.0008", "family" : "Symbio"}
};

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