Microsoft PowerShell 7.4.x < 7.4.22 / 7.5.x < 7.5.13 / 7.6.x < 7.6.9 RCE (macOS)

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

include('compat.inc');

if (description)
{
  script_id(374268);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/30");

  script_cve_id("CVE-2026-111497");
  script_xref(name:"IAVA", value:"2026-A-1202");

  script_name(english:"Microsoft PowerShell 7.4.x < 7.4.22 / 7.5.x < 7.5.13 / 7.6.x < 7.6.9 RCE (macOS)");

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft PowerShell install on the remote macOS host is affected by a remote code execution vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Microsoft PowerShell installed on the remote macOS host is 7.4.x prior to 7.4.22, 7.5.x prior to
7.5.13, or 7.6.x prior to 7.6.9. It is, therefore, affected by a remote code execution vulnerability. An out-of-bounds
write in the Brotli decoder used by PowerShell 7 allows an unauthorized attacker to elevate privileges over a network.
The issue affects use of Invoke-WebRequest or Invoke-RestMethod against websites without SSL or that the user does not
control.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://github.com/PowerShell/Announcements/blob/main/pwsh/2026/10/CVE-2026-111497.md
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?fda06208");
  script_set_attribute(attribute:"see_also", value:"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-111497");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Microsoft PowerShell version 7.4.22, 7.5.13, 7.6.9, or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  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:"cvss_score_source", value:"CVE-2026-111497");

  script_cwe_id(252, 787);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/10/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/30");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:powershell");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:apple:mac_os_x");
  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("microsoft_powershell_macos_installed.nbin");
  script_require_keys("installed_sw/PowerShell", "Host/MacOSX/Version");

  exit(0);
}

include('vdf.inc');

# @tvdl-content
var vuln_data = {
  'metadata': {'spec_version': '1.0'},
  'requires': [
    {'scope': 'target', 'match': {'os': 'macos'}}
  ],
  'checks': [
    {
      'product': {'name': 'PowerShell', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {'min_version': '7.4.0', 'fixed_version': '7.4.22'},
        {'min_version': '7.5.0', 'fixed_version': '7.5.13'},
        {'min_version': '7.6.0', 'fixed_version': '7.6.9'}
      ]
    }
  ]
};

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