FTPGate Web Proxy Traversal Arbitrary File Access

#
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if(description)
{
 script_id(10091);
 script_version ("1.24");
 script_cvs_date("Date: 2018/08/10 18:07:08");
 
 script_name(english:"FTPGate Web Proxy Traversal Arbitrary File Access");
 script_summary(english:"\..\..\file.txt");
 
 script_set_attribute(attribute:"synopsis", value:
"The remote host is affected by a directory traversal vulnerability." );
 script_set_attribute(attribute:"description", value:
"It is possible to read arbitrary files on the remote server by
prepending ../../ or ..\..\ in front of the file name." );
 script_set_attribute(attribute:"solution", value:
"Use another web proxy" );
 script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");

 script_set_attribute(attribute:"plugin_publication_date", value: "1999/11/05");
script_set_attribute(attribute:"plugin_type", value:"remote");
script_end_attributes();
 
 script_category(ACT_GATHER_INFO);
 script_copyright(english:"This script is Copyright (C) 1999-2018 Tenable Network Security, Inc.");
 script_family(english:"Web Servers");
 script_dependencie("http_version.nasl", "web_traversal.nasl");
 script_require_ports("Services/www", 8080);
 exit(0);
}

#
# The script code starts here
#

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

port = get_http_port(default: 8080);
if (get_kb_item(strcat("www/", port, "/generic_traversal"))) exit(0);

foreach d (make_list("windows", "winnt"))
{
  w = http_send_recv3(method:"GET", port: port,
    item:'..\\..\\..\\..\\..\\..\\'+d+'\\win.ini');
 if (isnull(w)) exit(1, "The web server did not answer");
 r = strcat(w[0], w[1], '\r\n', w[2]);
 if("[windows]" >< r || "[fonts]" >< r)
 {
   security_warning(port);
   exit(0);
  }
}