Nmap http-iis-webdav-vuln NSE Script


This page contains detailed information about how to use the http-iis-webdav-vuln NSE script. For list of all NSE scripts, visit the Nmap NSE Library.

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Overview
Error Messages

Script Overview

Script source code: https://github.com/nmap/nmap/tree/master/scripts/http-iis-webdav-vuln.nse
Script categories: vuln, intrusive
Target service / protocol: http, https
Target network port(s): 80, 443, 631, 7080, 8080, 8443, 8088, 5800, 3872, 8180, 8000
List of CVEs: -

Script Description

The http-iis-webdav-vuln.nse script checks for a vulnerability in IIS 5.1/6.0 that allows arbitrary users to access secured WebDAV folders by searching for a password-protected folder and attempting to access it. This vulnerability was patched in Microsoft Security Bulletin MS09-020, https://nmap.org/r/ms09-020.

A list of well known folders (almost 900) is used by default. Each one is checked, and if returns an authentication request (401), another attempt is tried with the malicious encoding. If that attempt returns a successful result (207), then the folder is marked as vulnerable.

This script is based on the Metasploit auxiliary module auxiliary/scanner/http/wmap_dir_webdav_unicode_bypass

For more information on this vulnerability and script, see:

Http-iis-webdav-vuln NSE Script Arguments

This is a full list of arguments supported by the http-iis-webdav-vuln.nse script:

basefolder

The folder to start in; eg, "/web" will try "/web/xxx".

folderdb

The filename of an alternate list of folders.

webdavfolder

Selects a single folder to use, instead of using a built-in list.

smbdomain

The domain to log in with. If you aren't in a domain environment, then anything will (should?) be accepted by the server.

smbhash

A password hash to use when logging in. This is given as a single hex string (32 characters) or a pair of hex strings (both 32 characters, optionally separated by a single character). These hashes are the LanMan or NTLM hash of the user's password, and are stored on disk or in memory. They can be retrieved from memory using the fgdump or pwdump tools.

smbnoguest

Use to disable usage of the 'guest' account.

smbpassword

The password to connect with. Be cautious with this, since some servers will lock accounts if the incorrect password is given. Although it's rare that the Administrator account can be locked out, in the off chance that it can, you could get yourself in trouble. To use a blank password, leave this parameter off altogether.

smbtype

The type of SMB authentication to use. These are the possible options:

  • v1: Sends LMv1 and NTLMv1.
  • LMv1: Sends LMv1 only.
  • NTLMv1: Sends NTLMv1 only (default).
  • v2: Sends LMv2 and NTLMv2.
  • LMv2: Sends LMv2 only.
  • NTLMv2: Doesn't exist; the protocol doesn't support NTLMv2 alone. The default, NTLMv1, is a pretty decent compromise between security and compatibility. If you are paranoid, you might want to use v2 or lmv2 for this. (Actually, if you're paranoid, you should be avoiding this protocol altogether!). If you're using an extremely old system, you might need to set this to v1 or lm, which are less secure but more compatible. For information, see smbauth.lua.

smbusername

The SMB username to log in with. The forms "DOMAIN\username" and "username@DOMAIN" are not understood. To set a domain, use the smbdomain argument.

slaxml.debug

Debug level at which default callbacks will print detailed parsing info. Default: 3

http.host

The value to use in the Host header of all requests unless otherwise set. By default, the Host header uses the output of stdnse.get_hostname().

http.max-body-size

Limit the received body to specific number of bytes. An oversized body results in an error unless script argument http.truncated-ok or request option truncated_ok is set to true. The default is 2097152 (2MB). Use value -1 to disable the limit altogether. This argument can be overridden case-by-case with request option max_body_size.

http.max-cache-size

The maximum memory size (in bytes) of the cache.

http.max-pipeline

If set, it represents the number of outstanding HTTP requests that should be sent together in a single burst. Defaults to http.pipeline (if set), or to what function get_pipeline_limit returns.

http.pipeline

If set, it represents the number of HTTP requests that'll be sent on one connection. This can be set low to make debugging easier, or it can be set high to test how a server reacts (its chosen max is ignored).

http.truncated-ok

Do not treat oversized body as error. (Use response object flag truncated to check if the returned body has been truncated.) This argument can be overridden case-by-case with request option truncated_ok.

http.useragent

The value of the User-Agent header field sent with requests. By default it is "Mozilla/5.0 (compatible; Nmap Scripting Engine; https://nmap.org/book/nse.html)". A value of the empty string disables sending the User-Agent header field.

- - -
To use these script arguments, add them to the Nmap command line using the --script-args arg1=value,[arg2=value,..] syntax. For example:

nmap --script=http-iis-webdav-vuln --script-args basefolder=value,folderdb=value <target>

Http-iis-webdav-vuln NSE Script Example Usage

Here's an example of how to use the http-iis-webdav-vuln.nse script:

nmap --script http-iis-webdav-vuln -p80,8080 <host>

Http-iis-webdav-vuln NSE Script Example Output

Here's a sample output from the http-iis-webdav-vuln.nse script:

80/tcp open  http    syn-ack
|_ http-iis-webdav-vuln: WebDAV is ENABLED. Vulnerable folders discovered: /secret, /webdav

Http-iis-webdav-vuln NSE Script Example XML Output

There is no sample XML output for this module. However, by providing the -oX <file> option, Nmap will produce a XML output and save it in the file.xml file.

Authors

  • Ron Bowes
  • Andrew Orr

References

See Also

Related NSE scripts to the http-iis-webdav-vuln.nse script:

Visit Nmap NSE Library for more scripts.

The http-iis-webdav-vuln.nse script may fail with the following error messages. Check for the possible causes by using the code snippets highlighted below found in the script source code. This can often times help in identifying the root cause of the problem.

Couldn't find http-folders.txt (should be in nselib/data)

Here is a relevant code snippet related to the "Couldn't find http-folders.txt (should be in nselib/data)" error message:

115:	  local folder_file
116:	  local farg = nmap.registry.args.folderdb
117:	  folder_file = farg and (nmap.fetchfile(farg) or farg) or nmap.fetchfile('nselib/data/http-folders.txt')
118:	
119:	  if(folder_file == nil) then
120:	    return false, "Couldn't find http-folders.txt (should be in nselib/data)"
121:	  end
122:	
123:	  local file = io.open(folder_file, "r")
124:	  if not file then
125:	    return false, ("Couldn't find or open %s"):format(folder_file)

Couldn't find or open %s

Here is a relevant code snippet related to the "Couldn't find or open %s" error message:

120:	    return false, "Couldn't find http-folders.txt (should be in nselib/data)"
121:	  end
122:	
123:	  local file = io.open(folder_file, "r")
124:	  if not file then
125:	    return false, ("Couldn't find or open %s"):format(folder_file)
126:	  end
127:	
128:	  while true do
129:	    local result
130:	    local line = file:read()

Could not determine vulnerability, since root folder is password protected

Here is a relevant code snippet related to the "Could not determine vulnerability, since root folder is password protected" error message:

157:	action = function(host, port)
158:	  -- Start by checking if '/' is protected -- if it is, we can't do the tests
159:	  local result = go_single(host, port, "/")
160:	  if(result == enum_results.NOT_VULNERABLE) then
161:	    stdnse.debug1("Root folder is password protected, aborting.")
162:	    return nmap.verbosity() > 0 and "Could not determine vulnerability, since root folder is password protected" or nil
163:	  end
164:	
165:	  stdnse.debug1("Root folder is not password protected, continuing...")
166:	
167:	  local response = get_response(host, port, "/")

WebDAV is DISABLED (PROPFIND failed).

Here is a relevant code snippet related to the "WebDAV is DISABLED (PROPFIND failed)." error message:

165:	  stdnse.debug1("Root folder is not password protected, continuing...")
166:	
167:	  local response = get_response(host, port, "/")
168:	  if(response.status == 501) then
169:	    -- WebDAV is disabled
170:	    stdnse.debug1("WebDAV is DISABLED (PROPFIND failed).")
171:	    return nmap.verbosity() > 0 and "WebDAV is DISABLED. Server is not currently vulnerable." or nil
172:	  else
173:	    if(response.status == 207) then
174:	      -- PROPFIND works, WebDAV is enabled
175:	      stdnse.debug1("WebDAV is ENABLED (PROPFIND was successful).")

PROPFIND request failed with "%s".

Here is a relevant code snippet related to the "PROPFIND request failed with "%s"." error message:

174:	      -- PROPFIND works, WebDAV is enabled
175:	      stdnse.debug1("WebDAV is ENABLED (PROPFIND was successful).")
176:	    else
177:	      -- probably not running IIS 5.0/5.1/6.0
178:	      if(response['status-line'] ~= nil) then
179:	        stdnse.debug1("PROPFIND request failed with "%s".", response['status-line'])
180:	      elseif(response['status'] ~= nil) then
181:	        stdnse.debug1("PROPFIND request failed with "%s".", response['status'])
182:	      else
183:	        stdnse.debug1("PROPFIND request failed.")
184:	      end

PROPFIND request failed with "%s".

Here is a relevant code snippet related to the "PROPFIND request failed with "%s"." error message:

176:	    else
177:	      -- probably not running IIS 5.0/5.1/6.0
178:	      if(response['status-line'] ~= nil) then
179:	        stdnse.debug1("PROPFIND request failed with "%s".", response['status-line'])
180:	      elseif(response['status'] ~= nil) then
181:	        stdnse.debug1("PROPFIND request failed with "%s".", response['status'])
182:	      else
183:	        stdnse.debug1("PROPFIND request failed.")
184:	      end
185:	      return fail("This web server is not supported.")
186:	    end

PROPFIND request failed.

Here is a relevant code snippet related to the "PROPFIND request failed." error message:

178:	      if(response['status-line'] ~= nil) then
179:	        stdnse.debug1("PROPFIND request failed with "%s".", response['status-line'])
180:	      elseif(response['status'] ~= nil) then
181:	        stdnse.debug1("PROPFIND request failed with "%s".", response['status'])
182:	      else
183:	        stdnse.debug1("PROPFIND request failed.")
184:	      end
185:	      return fail("This web server is not supported.")
186:	    end
187:	  end
188:

This web server is not supported.

Here is a relevant code snippet related to the "This web server is not supported." error message:

180:	      elseif(response['status'] ~= nil) then
181:	        stdnse.debug1("PROPFIND request failed with "%s".", response['status'])
182:	      else
183:	        stdnse.debug1("PROPFIND request failed.")
184:	      end
185:	      return fail("This web server is not supported.")
186:	    end
187:	  end
188:	
189:	
190:	  if(nmap.registry.args.webdavfolder ~= nil) then

WebDAV is ENABLED. Could not determine vulnerability of folder: %s

Here is a relevant code snippet related to the "WebDAV is ENABLED. Could not determine vulnerability of folder: %s" error message:

194:	    if(result == enum_results.VULNERABLE) then
195:	      return string.format("WebDAV is ENABLED. Folder is vulnerable: %s", folder)
196:	    elseif(result == enum_results.NOT_VULNERABLE) then
197:	      return nmap.verbosity() > 0 and string.format("WebDAV is ENABLED. Folder is NOT vulnerable: %s", folder) or nil
198:	    else
199:	      return nmap.verbosity() > 0 and string.format("WebDAV is ENABLED. Could not determine vulnerability of folder: %s", folder) or nil
200:	    end
201:	
202:	  else
203:	    local status, results, is_vulnerable = go(host, port)
204:

WebDAV is ENABLED. Protected folder found but could not be exploited. Server does not appear to be vulnerable.

Here is a relevant code snippet related to the "WebDAV is ENABLED. Protected folder found but could not be exploited. Server does not appear to be vulnerable." error message:

205:	    if(status == false) then
206:	      return fail(results)
207:	    else
208:	      if(#results == 0) then
209:	        if(is_vulnerable == false) then
210:	          return nmap.verbosity() > 0 and "WebDAV is ENABLED. Protected folder found but could not be exploited. Server does not appear to be vulnerable." or nil
211:	        else
212:	          return nmap.verbosity() > 0 and "WebDAV is ENABLED. No protected folder found; check not run. If you know a protected folder, add --script-args=webdavfolder=<path>" or nil
213:	        end
214:	      else
215:	        return "WebDAV is ENABLED. Vulnerable folders discovered: " .. table.concat(results, ", ")

Version

This page has been created based on Nmap version 7.92.

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