Script http-iis-short-name-brute

Script types: portrule
Categories: intrusive, brute
Download: https://svn.nmap.org/nmap/scripts/http-iis-short-name-brute.nse

Script Summary

Attempts to brute force the 8.3 filenames (commonly known as short names) of files and directories in the root folder of vulnerable IIS servers. This script is an implementation of the PoC "iis shortname scanner".

The script uses ~,? and * to bruteforce the short name of files present in the IIS document root. Short names have a restriction of 6 character file name followed by a three character extension.

Notes:

  • The script might have to be run twice (according to the original author).
  • Tested against IIS 6.0 and 5.1.

References:

Script Arguments

slaxml.debug

See the documentation for the slaxml library.

http.host, http.max-body-size, http.max-cache-size, http.max-pipeline, http.pipeline, http.truncated-ok, http.useragent

See the documentation for the http library.

smbdomain, smbhash, smbnoguest, smbpassword, smbtype, smbusername

See the documentation for the smbauth library.

vulns.short, vulns.showall

See the documentation for the vulns library.

Example Usage

nmap -p80 --script http-iis-short-name-brute <target>

Script Output 

PORT   STATE SERVICE
80/tcp open  http
| http-iis-short-name-brute:
|   VULNERABLE:
|   Microsoft IIS tilde character "~" short name disclosure and denial of service
|     State: VULNERABLE (Exploitable)
|     Description:
|      Vulnerable IIS servers disclose folder and file names with a Windows 8.3 naming scheme inside the webroot folder.
|      Shortnames can be used to guess or brute force sensitive filenames. Attackers can exploit this vulnerability to
|      cause a denial of service condition.
|
|     Extra information:
|
|   8.3 filenames found:
|     Folders
|       admini~1
|     Files
|       backup~1.zip
|       certsb~2.zip
|       siteba~1.zip
|
|     References:
|       http://soroush.secproject.com/downloadable/microsoft_iis_tilde_character_vulnerability_feature.pdf
|_      https://github.com/irsdl/IIS-ShortName-Scanner

Requires

Authors:

  • Jesper Kueckelhahn
  • Paulino Calderon

License: Same as Nmap--See https://nmap.org/book/man-legal.html