File ldap-brute
Download: http://nmap.org/svn/scripts/ldap-brute.nse
User Summary
Attempts to brute-force LDAP authentication. By default
it uses the built-in username and password lists. In order to use your
own lists use the userdb and passdb script arguments.
This script does not make any attempt to prevent account lockout! If the number of passwords in the dictionary exceed the amount of allowed tries, accounts will be locked out. This usually happens very quickly.
Authenticating against Active Directory using LDAP does not use the Windows user name but the user accounts distinguished name. LDAP on Windows 2003 allows authentication using a simple user name rather than using the fully distinguished name. E.g., "Patrik Karlsson" vs. "cn=Patrik Karlsson,cn=Users,dc=cqure,dc=net" This type of authentication is not supported on e.g. OpenLDAP.
This script uses some AD-specific support and optimizations:
- LDAP on Windows 2003 reports different error messages depending on whether an account exists or not. If the script recieves an error indicating that the username does not exist it simply stops guessing passwords for this account and moves on to the next.
- The script attempts to authenticate with the username only if no LDAP base is specified. The benefit of authenticating this way is that the LDAP path of each account does not need to be known in advance as it's looked up by the server.
Script Arguments
ldap.base
If set, the script will use it as a base for the password guessing attempts. If unset the user list must either contain the distinguished name of each user or the server must support authentication using a simple user name. See the AD discussion in the description.
passdb, unpwdb.passlimit, unpwdb.timelimit, unpwdb.userlimit, userdb
See the documentation for the unpwdb library.Example Usage
nmap -p 389 --script ldap-brute --script-args \ ldap.base='"cn=users,dc=cqure,dc=net"' <host>
Script Output
389/tcp open ldap | ldap-brute: |_ ldaptest:ldaptest => Login Correct
Requires
Author: Patrik Karlsson
License: Same as Nmap--See http://nmap.org/book/man-legal.html