Zyxel USG < 5.37 Command Injection (CVE-2023-28767)

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

include('compat.inc');

if (description)
{
  script_id(178464);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/12/01");

  script_cve_id("CVE-2023-28767");
  script_xref(name:"IAVA", value:"2023-A-0372-S");

  script_name(english:"Zyxel USG < 5.37 Command Injection (CVE-2023-28767)");

  script_set_attribute(attribute:"synopsis", value:
"The remote security gateway is affected by a command injection vulnerability.");
  script_set_attribute(attribute:"description", value:
"Firmware version of the Zyxel USG, ATP, or VPN is less than 5.37 and is affected by a vulnerability. The configuration
parser fails to sanitize user-controlled input. An unauthenticated, LAN-based attacker could leverage the vulnerability
to inject some operating system (OS) commands into the device configuration data on an affected device when the cloud
management mode is enabled.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-wlan-controllers
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?315d4ab6");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Zyxel USG / ATP / VPN to 5.37 or later.");
  script_set_cvss_base_vector("CVSS2#AV:A/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2023-28767");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"vuln_publication_date", value:"2023/07/18");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/07/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/07/19");

  script_set_attribute(attribute:"plugin_type", value:"combined");
  script_set_attribute(attribute:"cpe", value:"cpe:/h:zyxel:usg_flex");
  script_set_attribute(attribute:"cpe", value:"x-cpe:/h:zyxel:usg");
  script_set_attribute(attribute:"cpe", value:"x-cpe:/o:zyxel:usg");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Firewalls");

  script_copyright(english:"This script is Copyright (C) 2023 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("zyxel_usg_web_detect.nbin", "zyxel_usg_detect.nbin");
  script_require_keys("installed_sw/Zyxel Unified Security Gateway (USG)");
  script_require_ports("Services/www", 80, 443);

  exit(0);
}

include('vcf.inc');

var app = 'Zyxel Unified Security Gateway (USG)';


var app_info = vcf::combined_get_app_info(app:app);

var model = app_info['Model'];
var constraints = [];

if(empty_or_null(model))
  audit(AUDIT_OS_CONF_UNKNOWN, 'Zyxel device');

# Not checking for cloud management mode
if (report_paranoia < 2)
  audit(AUDIT_POTENTIAL_VULN, 'Zyxel device');

if ('ATP' >< model || 'USG20' >< model || 'USG FLEX 50' >< model)
  constraints = [{'min_version' : '5.10', 'max_version' : '5.36', 'fixed_version' : '5.37'}];
else if ('USG FLEX' >< model || 'VPN' >< model)
  constraints = [{'min_version' : '5.0', 'max_version' : '5.36', 'fixed_version' : '5.37'}];
else
  audit(AUDIT_NOT_INST, 'Zyxel USG / ATP / VPN Device');

vcf::check_version_and_report(
    app_info:app_info,
    constraints:constraints,
    severity:SECURITY_HOLE
);