SolarWinds Serv-U 15.4 Access Control (CVE-2023-35179)

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

include('compat.inc');

if (description)
{
  script_id(179953);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2023/09/26");

  script_cve_id("CVE-2023-35179");
  script_xref(name:"IAVA", value:"2023-A-0425-S");

  script_name(english:"SolarWinds Serv-U 15.4 Access Control (CVE-2023-35179)");

  script_set_attribute(attribute:"synopsis", value:
"The remote FTP server is affected by an access control vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of SolarWinds Serv-U installed on the remote host is 15.4, prior to 15.4.0 hotfix 1. It is, therefore, 
potentially affected by an access control vulnerability as referenced in the vendor advisory.

  - SolarWinds Serv-U allows an actor to bypass multi-factor/two-factor authentication. The actor must have 
    administrator-level access to Serv-U to perform this action (CVE-2023-35179)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported 
version number.");
  # https://www.solarwinds.com/trust-center/security-advisories/CVE-2023-35179
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f73ac2c4");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Serv-U version 15.4 Hotfix 1 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:M/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:N/AC:L/PR:H/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-2023-35179");

  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:"2023/08/04");
  script_set_attribute(attribute:"patch_publication_date", value:"2023/08/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2023/08/18");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:solarwinds:serv-u");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:solarwinds:serv-u_file_server");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:serv-u:serv-u");
  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:"FTP");

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

  script_dependencies("servu_version.nasl");
  script_require_keys("installed_sw/Serv-U", "Settings/ParanoidReport");

  exit(0);
}


include('vcf.inc');
include('ftp_func.inc');

# Unable to determine if HF is installed.
if (report_paranoia < 2) 
  audit(AUDIT_PARANOID);

var port = get_ftp_port(default:21);
var app_info = vcf::get_app_info(app:'Serv-U', port:port);

var constraints = [
  { 'fixed_display' : '15.4 HF1', 'equal' : '15.4'}
];

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