Curl 7.40.0 < 8.20.0 Wrong SMB Connection Reuse

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

include('compat.inc');

if (description)
{
  script_id(311423);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/14");

  script_cve_id("CVE-2026-5773");
  script_xref(name:"IAVA", value:"2026-A-0397");

  script_name(english:"Curl 7.40.0 < 8.20.0 Wrong SMB Connection Reuse");

  script_set_attribute(attribute:"synopsis", value:
"The remote host has a program that is affected by a wrong SMB connection reuse vulnerability");
  script_set_attribute(attribute:"description", value:
"The version of curl installed on the remote host is 7.40.0 prior to 8.20.0. It is, therefore, affected by
a wrong SMB connection reuse vulnerability:

  - libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers. The code
    erroneously did not consider the share name as a property to match for connection reuse, so subsequent
    SMB transfers could incorrectly reuse connections intended for different shares on the same server.
    This could result in downloading incorrect files or uploading files to unintended locations.
    (CVE-2026-5773)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://curl.se/docs/CVE-2026-5773.html");
  script_set_attribute(attribute:"solution", value:
"Upgrade Curl to version 8.20.0 or later");
  script_set_attribute(attribute:"agent", value:"all");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-5773");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/04/29");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/05/01");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"asset_categories", value:"component");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:haxx:curl");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

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

  script_dependencies("curl_win_installed.nbin", "curl_nix_installed.nbin");
  script_require_keys("installed_sw/Curl");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'checks': [
    {
      'product': {'name': 'Curl', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {'min_version': '7.40.0', 'fixed_version': '8.20.0'}
      ]
    }
  ]
};

var res = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_HOLE, check_backporting:TRUE);
vdf::handle_check_and_report_errors(vdf_result:res);