libcurl 7.14.0 < 8.20.0 Netrc Password Leak on HTTP Redirect

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

include('compat.inc');

if (description)
{
  script_id(311421);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/15");

  script_cve_id("CVE-2026-6429");
  script_xref(name:"IAVA", value:"2026-A-0397");

  script_name(english:"libcurl 7.14.0 < 8.20.0 Netrc Password Leak on HTTP Redirect");

  script_set_attribute(attribute:"synopsis", value:
"The remote host has a program that is affected by a netrc password leak vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of libcurl installed on the remote host is 7.14.0 prior to 8.20.0. It is, therefore, affected by
a netrc password leak vulnerability:

  - When asked to both use a .netrc file for credentials and to follow HTTP redirects, libcurl could leak
    the password used for the first host to the followed-to host under certain circumstances. The issue
    requires that both the original and redirect destinations use unencrypted http:// URLs, both requests
    traverse an identical HTTP proxy, and the connection between client and proxy gets reused.
    (CVE-2026-6429)

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-2026-6429.html");
  script_set_attribute(attribute:"solution", value:
"Upgrade libcurl 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:P/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:H/PR:L/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-2026-6429");

  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:libcurl");
  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("libcurl_nix_installed.nbin", "libcurl_win_installed.nbin");
  script_require_keys("installed_sw/libcurl");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'checks': [
    {
      'product': {'name': 'libcurl', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {'min_version': '7.14.0', 'fixed_version': '8.20.0'}
      ]
    }
  ]
};

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