12c How to UN Expire Password for CDB Users

Use dbms_metadata.get_ddl to extract user and replace create with alter.

oracle@arrow ~ $ sqlplus / as sysdba

SQL*Plus: Release 12.1.0.2.0 Production on Sat Jun 10 15:31:13 2017

Copyright (c) 1982, 2014, Oracle.  All rights reserved.


Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Advanced Analytics
and Real Application Testing options

SQL> select username, expiry_date, account_status from dba_users where username like '%MONITOR%';

USERNAME
--------------------------------------------------------------------------------
EXPIRY_DA ACCOUNT_STATUS
--------- --------------------------------
C##MONITOR
10-JUN-17 EXPIRED

SQL> show con_name

CON_NAME
------------------------------
CDB$ROOT

SQL> set long 1000000 longchunksize 32000 linesize 32000 pages 0 newpage none
SQL> set heading off tab off echo off define off sqlprefix off blockterminator off timing off verify off feedb off
SQL> set sqlblanklines on embedded on trimspool on  
SQL> select dbms_metadata.get_ddl('USER','C##MONITOR') from dual;

   CREATE USER "C##MONITOR" IDENTIFIED BY VALUES 'S:***'
      DEFAULT TABLESPACE "USERS"
      TEMPORARY TABLESPACE "TEMP"
      PASSWORD EXPIRE

SQL> ALTER USER "C##MONITOR" IDENTIFIED BY VALUES 'S:***'
SQL> select username, expiry_date, account_status from dba_users where username like '%MONITOR%';
C##MONITOR                                                                                       07-DEC-17 OPEN
SQL>