Parallels Desktop < 27.0.0 Local Privilege Escalation (macOS)

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

include('compat.inc');

if (description)
{
  script_id(347968);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/18");

  script_cve_id("CVE-2026-90894");
  script_xref(name:"IAVB", value:"2026-B-0268");

  script_name(english:"Parallels Desktop < 27.0.0 Local Privilege Escalation (macOS)");

  script_set_attribute(attribute:"synopsis", value:
"An application installed on the remote macOS host is affected by a privilege escalation vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Parallels Desktop installed on the remote macOS host is prior to 27.0.0. It is, therefore, affected by
a privilege escalation vulnerability:

  - Parallels Desktop runs prl_disp_service as root. Local clients reach it on the world-writable socket
    /var/run/prl_disp_service.socket. PrlSrv_LoginLocal accepts peer credentials. No Parallels signature. No admin
    group. After login, PrlSrv_InstallAppliance lets you pick the appliance folder (sVmParentPath). The daemon unpacks
    with one string, tar -xf '%1' -C '%2', then Qt QProcess::splitCommand chops that string into words. A quote in the
    folder name closes early. The leftover text becomes extra tar flags. macOS tar --use-compress-program= runs the
    named program as root. (CVE-2026-90894)

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://kb.parallels.com/en/131168");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Parallels Desktop version 27.0.0 or later.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-90894");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/09/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/18");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:parallels:parallels_desktop");
  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_parallels_desktop_installed.nbin");
  script_require_keys("installed_sw/Parallels Desktop", "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': 'Parallels Desktop', 'type': 'app'},
      'check_algorithm': 'default',
      'constraints': [
        {'fixed_version': '27.0.0'}
      ]
    }
  ]
};

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