How to restrict the anonymous connections to a samba server from enumerating the domain users information ?

Solution Verified - Updated -

Issue

  • Anonymous rpcclient connections to RHEL samba servers are able to enumerate the domain users using enumdomusers.

  • After connecting to the samba server as anonymous user :

root@rhel:~# rpcclient -U "" xx.xx.xx.xx
  Enter 's password:
  • Users are able to list the domain users information with the command enumdomusers as below : 
  rpcclient $> enumdomusers
  user:[nobody] rid:[0x1f5]
  user:[gh0s7] rid:[0x3e8]
  • How to restrict the anonymous users to be able to list this information ?

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

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