#
# This script was written by Javier Fernández-Sanguino Peña <jfs@computer.org>
# based on scripts made by Renaud Deraison <deraison@cvs.nessus.org>
#
# Slightly modified by rd to to do pattern matching.
#
# See the Nessus Scripts License for details
#

if(description)
{
 script_id(10781);
 script_cve_id("CVE-2001-0660");
 script_bugtraq_id(3301);
 script_version ("$Revision$");
 
 name["english"] = "Outlook Web anonymous access";
 script_name(english:name["english"]);
 
 desc["english"] = "It is possible to browse the
information of the OWA server by accessing as an
anonymous user with the following URL:

http://www.example.com/exchange/root.asp?acs=anon

After this access, the anonymous user can search
for valid users in the OWA server and can enumerate
all users by accessing the following URL:

http://www.example.com/exchange/finduser/details.asp?obj=XXX
(where XXX is a string of 65 hexadecimal numbers)

Data that can be accessed by an anonymous user
may include: usernames, server names, email name accounts,
phone numbers, departments, office, management relationships...

This information will help an attacker to make social
engineering attacks with the knowledge gained. This attack
can be easily automated since, even if direct access to search
is not possible, you only need the cookie given on the anonymous
login access.

Administrators might be interested in consulting
the following URL:

http://support.microsoft.com/support/exchange/content/whitepapers/owaguide.doc

Solution:
	Disable anonymous access to OWA. Follow these steps:
	1. In Microsoft Exchange Administrator open the Configuration container.
	2. Choose Protocols, and then double-click HTTP (Web) Site Settings
	3. Unselect the 'Allow anonymous users to access 
	the anonymous public folders' check box.
	4. Select the Folder Shortcuts tab.
	5. Remove all folders which are allowed anonymous viewing.
        6. Choose OK.
	7. Remove the anonymous access from the login web pages.
	
Risk factor : Medium";	
	
 script_description(english:desc["english"]);
 
 summary["english"] = "Outlook Web anonymous access";
 script_summary(english:summary["english"]);
 
 script_category(ACT_GATHER_INFO);
 
 
 script_copyright(english:"This script is Copyright (C) 2001 Javier Fernández-Sanguino Peña");
 family["english"] = "CGI abuses";
 script_family(english:family["english"]);
 script_dependencie("find_service.nes", "no404.nasl", "http_version.nasl");
 script_require_ports("Services/www", 80);
# This should also depend on finding an IIS
 script_require_keys("www/iis");
 exit(0);
}

#
# The script code starts here
#

include("http_func.inc");

port = get_kb_item("Services/www");
if(!port)port = 80;

if(!get_port_state(port))exit(0);




 cgi = "/exchange/root.asp?acs=anon";
 port = is_cgi_installed(cgi);
 if(port)
 {
  soc = http_open_socket(port);
  req = http_get(item:"/exchange/root.asp?acs=anon", port:port);
  send(socket:soc, data:req);
  r = http_recv(socket:soc);
  http_close_socket(soc);
  if ("/exchange/logonfrm.asp" >< r)
  {
   soc = http_open_socket(port);
   req = http_get(item:"/exchange/logonfrm.asp", port:port);
   send(socket:soc, data:req);
   r = http_recv(socket:soc);
   http_close_socket(soc);

   if (!("This page has been disabled" >< r))
   {
    security_hole(port);
   }
  }
 }