Microsoft IIS .IDA ISAPI Filter Enabled

🗓️ 19 Jun 2001 00:00:00Reported by TenableType
IIS .IDA filter enabled on server poses vulnerability; recommend unmapping and installing URLSCAN.
#%NASL_MIN_LEVEL 70300
#
# This script was written by Matt Moore <[email protected]>
#
# www.westpoint.ltd.uk
#
#
# Modified by rd to have a language independent pattern matching, thanks
# to the remarks from Nicolas Gregoire <[email protected]>
#
# See the Nessus Scripts License for details
#


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

if(description)
{
  script_id(10695);
  script_version("1.38");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/11");

  script_name(english:"Microsoft IIS .IDA ISAPI Filter Enabled");

  script_set_attribute(attribute:"synopsis", value:
"Indexing Service filter is enabled on the remote Web server.");
  script_set_attribute(attribute:"description", value:
"The IIS server appears to have the .IDA ISAPI filter mapped.

At least one remote vulnerability has been discovered for the .IDA
(indexing service) filter. This is detailed in Microsoft Advisory
MS01-033, and gives remote SYSTEM level access to the web server. 

It is recommended that even if you have patched this vulnerability that
you unmap the .IDA extension, and any other unused ISAPI extensions
if they are not required for the operation of your site.");
  script_set_attribute(attribute:"solution", value:
"To unmap the .IDA extension:
 1.Open Internet Services Manager. 
 2.Right-click the Web server choose Properties from the context menu. 
 3.Master Properties 
 4.Select WWW Service -> Edit -> HomeDirectory -> Configuration 
 5.Remove the reference to .ida from the list.

In addition, you may wish to download and install URLSCAN from the
Microsoft Technet website.  URLSCAN, by default, blocks all .ida
requests to the IIS server.");
  script_set_attribute(attribute:"risk_factor", value:"None");

  script_set_attribute(attribute:"plugin_publication_date", value:"2001/06/19");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:iis");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Web Servers");

  script_copyright(english:"This script is Copyright (C) 2001-2022 Matt Moore");

  script_dependencies("find_service1.nasl", "no404.nasl", "http_version.nasl", "www_fingerprinting_hmap.nasl");
  script_require_ports("Services/www", 80);

  exit(0);
}

# Check makes a request for NULL.ida
include("http_func.inc");
include("global_settings.inc");

port = get_http_port(default:80, embedded:TRUE);

if ( get_kb_item("Services/www/" + port + "/embedded") ) exit(0);
sig = get_kb_item("www/hmap/" + port + "/description");
if ( sig && "IIS" >!< sig ) exit(0);
if(get_port_state(port))
{ 
 req = http_get(item:"/NULL.ida", port:port);
 soc = http_open_socket(port);
 if(soc)
 {
 send(socket:soc, data:req);
 r = http_recv(socket:soc);
 http_close_socket(soc);
 look = strstr(r, "<HTML>");
 look = look - string("\r\n");
 if(egrep(pattern:"^.*HTML.*IDQ.*NULL\.ida.*$", string:look)) security_note(port);
 }
}
11 Apr 2022 00:00Current
5.5Medium risk
Vulners AI Score5.5