Traefik 2.11.x < 2.11.38 / 3.x < 3.6.9 Connection Header Bypass

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

include('compat.inc');

if (description)
{
  script_id(318670);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/09");

  script_cve_id("CVE-2026-29054");
  script_xref(name:"IAVB", value:"2026-B-0059");

  script_name(english:"Traefik 2.11.x < 2.11.38 / 3.x < 3.6.9 Connection Header Bypass");

  script_set_attribute(attribute:"synopsis", value:
"The remote macOS host is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Traefik installed on the remote macOS host is 2.11.x prior to 2.11.38 or 3.x prior to 3.6.9. It is,
therefore, affected by a vulnerability:

  - A flaw exists in HTTP/1.1 request handling due to case-sensitive comparison of Connection header tokens
    against protected header names. An unauthenticated, remote attacker can exploit this, via lowercase
    Connection tokens, to bypass protection and trigger the removal of Traefik-managed forwarded identity
    headers. (CVE-2026-29054)

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://github.com/traefik/traefik/releases/tag/v2.11.38");
  script_set_attribute(attribute:"see_also", value:"https://github.com/traefik/traefik/releases/tag/v3.6.9");
  # https://github.com/traefik/traefik/security/advisories/GHSA-92mv-8f8w-wq52
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b3582692");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Traefik version 2.11.38, 3.6.9, or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:C/A:N");
  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:N/UI:N/S:U/C:N/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-29054");

  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:"2026/03/05");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/03/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/04");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:traefik:traefik");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"MacOS X Local Security Checks");

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

  script_dependencies("macos_traefik_installed.nbin");
  script_require_keys("Host/local_checks_enabled", "installed_sw/traefik");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'requires': [
    {
      'scope': 'target',
      'match': {'os': 'macos'}
    }
  ],
  'checks': [
    {
      'product': {'name': 'traefik', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {'min_version': '2.11.9', 'fixed_version': '2.11.38'},
        {'min_version': '3.1.3', 'fixed_version': '3.6.9'}
      ]
    }
  ]
};

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