Rapid7 Vulnerability & Exploit Database

MS09-020 IIS6 WebDAV Unicode Authentication Bypass

Back to Search

MS09-020 IIS6 WebDAV Unicode Authentication Bypass



This module attempts to to bypass authentication using the WebDAV IIS6 Unicode vulnerability discovered by Kingcope. The vulnerability appears to be exploitable where WebDAV is enabled on the IIS6 server, and any protected folder requires either Basic, Digest or NTLM authentication.


  • et <et@metasploit.com>
  • aushack <patrick@osisecurity.com.au>


Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':

msf > use auxiliary/scanner/http/ms09_020_webdav_unicode_bypass
msf auxiliary(ms09_020_webdav_unicode_bypass) > show actions
msf auxiliary(ms09_020_webdav_unicode_bypass) > set ACTION < action-name >
msf auxiliary(ms09_020_webdav_unicode_bypass) > show options
    ...show and set options...
msf auxiliary(ms09_020_webdav_unicode_bypass) > run 

Time is precious, so I don’t want to do something manually that I can automate. Leveraging the Metasploit Framework when automating any task keeps us from having to re-create the wheel as we can use the existing libraries and focus our efforts where it matters.

– Jim O’Gorman | President, Offensive Security