Synology DiskStation Manager < 4.3-3776 Update 3 info.cgi Multiple Parameters XSS

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

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

if (description)
{
  script_id(72344);
  script_version("1.7");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/19");

  script_bugtraq_id(62310);
  script_xref(name:"EDB-ID", value:"28243");

  script_name(english:"Synology DiskStation Manager < 4.3-3776 Update 3 info.cgi Multiple Parameters XSS");
  script_summary(english:"Checks the version of Synology DiskStation Manager");

  script_set_attribute(attribute:"synopsis", value:
"The remote Synology DiskStation Manager is affected by a cross-site
scripting vulnerability.");
  script_set_attribute(attribute:"description", value:
"According to its version number, the Synology DiskStation Manager
installed on the remote host is a version prior to 4.3-3776 Update 3. 
It is, therefore, potentially affected by a cross-site scripting
vulnerability because it fails to properly sanitize user-supplied input
to the 'host', 'target' and 'add' parameters of the 'info.cgi' script. 

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://seclists.org/fulldisclosure/2013/Sep/53");
  script_set_attribute(attribute:"solution", value:"Upgrade to 4.3-3776 Update 3 or later, or contact the vendor.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:F/RL:U/RC:ND");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
  script_cwe_id(20, 74, 79, 442, 629, 711, 712, 722, 725, 750, 751, 800, 801, 809, 811, 864, 900, 928, 931, 990);

  script_set_attribute(attribute:"vuln_publication_date", value:"2013/09/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2013/09/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2014/02/05");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:synology:diskstation_manager");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2014-2021 Tenable Network Security, Inc.");

  script_dependencies("synology_diskstation_manager_detect.nbin");
  script_require_keys("www/synology_dsm");
  script_require_ports("Services/www", 5000, 5001);

  exit(0);
}

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

port = get_http_port(default:5000, embedded:TRUE);

install = get_install_from_kb(appname:"synology_dsm", port:port, exit_on_fail:TRUE);

app = "Synology DiskStation Manager (DSM)";
dir = install["dir"];
install_loc = build_url(port:port, qs:dir + "/");

version = install["ver"];
if (version == UNKNOWN_VER) audit(AUDIT_UNKNOWN_WEB_APP_VER, app, install_loc);

ver = split(version, sep:".", keep:FALSE);
for (i=0; i<max_index(ver); i++)
  ver[i] = int(ver[i]);

if (
  (ver[0] < 4) ||
  (ver[0] == 4 && ver[1] < 3) ||
  (ver[0] == 4 && ver[1] == 3 && ver[2] < 3776) ||
  ((ver[0] == 4 && ver[1] == 3 && ver[2] == 3776) && report_paranoia == 2)
)
{
  set_kb_item(name:"www/"+port+"/XSS", value:TRUE);

  if (report_verbosity > 0)
  {
    report =
      '\n  URL               : ' + install_loc +
      '\n  Installed version : ' + version +
      '\n  Fixed version     : 4.3-3776 Update 3\n';
    security_warning(port:port, extra:report);
  }
  else security_warning(port);
}
else audit(AUDIT_WEB_APP_NOT_AFFECTED, app, install_loc, version);