I used the following commands to downgrade my packages and it resolved the security regression as workaround.
# problem net rpc group -S localhost -U Administrator%<secret> Could not connect to server localhost Connection failed: NT_STATUS_ACCESS_DENIED # workaround aptitude install samba=2:3.6.6-6+deb7u7 aptitude install samba-common-bin=2:3.6.6-6+deb7u7 aptitude install samba-doc=2:3.6.6-6+deb7u7 # check versions: dpkg -l libnss-winbind libpam-winbind libwbclient0 samba samba-common samba-common-bin samba-doc smbclient winbind
