Fortinet FortiAnalyzer 5.0.x < 5.0.3 LDAP Authentication Bypass

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(84919);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/19");


  script_name(english:"Fortinet FortiAnalyzer 5.0.x < 5.0.3 LDAP Authentication Bypass");
  script_summary(english:"Checks the version of FortiAnalyzer.");

  script_set_attribute(attribute:"synopsis", value:
"The remote host is potentially affected by an authentication bypass
vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of Fortinet FortiAnalyzer running on the remote host is
5.0.x prior to 5.0.3. It is, therefore, potentially affected by an
authentication bypass vulnerability that allows an LDAP user to
authenticate without entering a password when LDAP is configured and
enabled.

Note that Nessus has not tested for this issue or the host
configuration but has instead relied only on the application's
self-reported version number.");
  # https://kb.fortinet.com/kb/microsites/search.do?cmd=displayKC&docType=kc&externalId=FortiAnalyzer-v50-Patch-Release-3-Release-Notespdf
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?999bb365");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Fortinet FortiAnalyzer 5.0.3 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:ND");

  script_set_attribute(attribute:"vuln_publication_date", value:"2013/10/05");
  script_set_attribute(attribute:"patch_publication_date", value:"2013/10/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2015/07/22");

  script_set_attribute(attribute:"potential_vulnerability", value:"true");
  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:fortinet:fortianalyzer_firmware");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"CGI abuses");

  script_copyright(english:"This script is Copyright (C) 2015-2021 Tenable Network Security, Inc.");

  script_dependencies("fortinet_version.nbin");
  script_require_keys("Host/Fortigate/model", "Host/Fortigate/version", "Settings/ParanoidReport");

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");

if (report_paranoia < 2) audit(AUDIT_PARANOID); # LDAP must be enabled and configured

app_name = "FortiAnalyzer";
model = get_kb_item_or_exit("Host/Fortigate/model");
version = get_kb_item_or_exit("Host/Fortigate/version");

# Make sure device is FortiAnalyzer.
if (!preg(string:model, pattern:"fortianalyzer", icase:TRUE)) audit(AUDIT_HOST_NOT, "a " + app_name + " device");

if (version !~ "^5\.") audit(AUDIT_INST_VER_NOT_VULN, app_name, version);

fix = "5.0.3";

if (ver_compare(ver:version, fix:fix, strict:FALSE) == -1)
{
  port = 0;
  if (report_verbosity > 0)
  {
    report =
      '\n  Model             : ' + model +
      '\n  Installed version : ' + version +
      '\n  Fixed version     : ' + fix +
      '\n';

    security_hole(extra:report, port:port);
  }
  else security_hole(port:port);
}
else audit(AUDIT_INST_VER_NOT_VULN, app_name, version);