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SQL Injection is one of the most common security vulnerabilities on the web. Here I’ll try to explain in detail these kinds of vulnerabilities with examples of bugs in PHP and possible solutions.
If you are not so confident with programming languages and web technologies you may be wondering what SQL stands for. Well, it’s an acronym for Structured Query Language (pronounced “sequel”). It’s “de facto” the standard language to access and manipulate data in databases.
Nowadays most websites rely on a database (usually MySQL) to store and access data.
Our example will be a common login form. Internet surfers see those login forms every day, you put your username and password in and then the server checks the credentials you supplied. Ok, that’s simple, but what happens exactly on the server when he checks your credentials?
The client (or user) sends to the server two strings, the username and the password.
Usually the server will have a database with a table where the user’s data are stored. This table has at least two columns, one to store the username and one for the password. When the server receives the username and password strings he will query the database to see if the supplied credentials are valid. He will use an SQL statement for that that may look like this:
SELECT * FROM users WHERE username='SUPPLIED_USER' AND password='SUPPLIED_PASS'
For those of you who are not familiar with the SQL language, in SQL the ‘ character is used as a delimiter for string variables. Here we use it to delimit the username and password strings supplied by the user.
Hack This Site Realistic 3:
In basic 11, the file was hidden in apache so, if we're talking about apache, in apache how we hide files is through .htaccess.
Basic 9 (Transverse Directory):
<!--#exec cmd="ls ../../9"-->
Basic 8 clue:
SSI Server Side Include:
<!--# exec cmd="ls ../"-->