BeyondTrust Remote Support (RS) < 25.3.3 Multiple Vulnerabilities (BT26-03)

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

include('compat.inc');

if (description)
{
  script_id(325646);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/09");

  script_cve_id(
    "CVE-2026-40138",
    "CVE-2026-40139",
    "CVE-2026-40140",
    "CVE-2026-40141"
  );

  script_name(english:"BeyondTrust Remote Support (RS) < 25.3.3 Multiple Vulnerabilities (BT26-03)");

  script_set_attribute(attribute:"synopsis", value:
"An application running on the remote web server is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of BeyondTrust Remote Support (RS) running on the remote host is prior to 25.3.3. It is, therefore,
affected by multiple vulnerabilities, including:

  - A critical pre-authentication vulnerability in the authentication subsystem. Improper validation of
    authentication data may allow a network-positioned attacker to bypass access controls and gain unauthorized
    access to the appliance, including accounts with elevated privileges. (CVE-2026-40138)

  - A critical pre-authentication vulnerability in the authentication subsystem. Improper processing of
    authentication requests may allow an unauthenticated remote attacker to bypass access controls and gain
    unauthorized access to the appliance, including accounts with elevated privileges. (CVE-2026-40139)

  - A high-severity vulnerability in a web application component related to the processing of certain input
    parameters. Insufficient validation of user-supplied input may allow an authenticated attacker with limited
    privileges to access unintended resources or data beyond their authorization scope. (CVE-2026-40141)

Note that Nessus has not tested for these issues but has instead relied only on the application's
self-reported version number.");
  script_set_attribute(attribute:"see_also", value:"https://www.beyondtrust.com/trust-center/security-advisories/bt26-03");
  script_set_attribute(attribute:"solution", value:
"Upgrade to BeyondTrust Remote Support (RS) version 25.3.3 or later.");
  script_set_attribute(attribute:"agent", value:"windows");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/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:L/PR:L/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:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-40139");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-40141");

  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:"2026/06/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/06/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/08");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:beyondtrust:remote_support");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CGI abuses");

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

  script_dependencies("beyondtrust_remote_support_detect.nbin", "beyondtrust_remote_support_win_installed.nbin");
  script_require_keys("installed_sw/BeyondTrust Remote Support");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'checks': [
    {
      'product': {'name': 'BeyondTrust Remote Support', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {'fixed_version': '25.3.3'}
      ]
    }
  ]
};

var result = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_HOLE);
vdf::handle_check_and_report_errors(vdf_result:result);