![]() ![]() Other forms of comments are difficult to use(for eg- double dash is filtered by the application).However, it might be useful to overcome situations when: QUERY GENERATED (ADMINISTRATOR RIGHTS): INSERT INTO usa_hacker (hacker_nane, challenge_id,score) VALUES ('attacker', 102, /*', 0, '*/'90')Īs it was mentioned before, these techniques are rarely used in real circumstances. REMOVES ALL DASHES AND NUMBER SIGNS FROM THE INPUT, THEN IT COMBINES THE QUERY: INSERT INTO usa_hacker (hacker_nane, challenge_id) VALUES ('".$username."', 0)ĪTTACKER’S INPUT (hacker_nane 1st, challenge_id 2nd LINE): attacker', 102, /* For that, he can use C-style comments to eliminate that part of the query. The last position where comments can be used to facilitate an SQL injection is when multiple weak inputs are combined by the user in the same query. It is also true for many subjects where user input is blended into the subquery. The exact result could be achieved without using line commenting. THE SCRIPT TO BUILD A QUERY WITHOUT SANITIZING DATA: SELECT hacker_nane, challenge_id FROM usa_hacker WHERE hacker_nane='".$value."' AND hacker_id>=2 Īs we see in the above query, by using the COMMENT clause the attacker destroys the last condition and doesn’t want to handle the trailing section. The weak script and attack are shown below: The example to illustrate the termination of a query by using the COMMENT clause. The MariaDB element is part of the query and the negative input must be formulated properly by the user to avoid syntax errors. The problem normally comes what follows by the user’s parameters. Normally while terminating a query properly in MariaDB, it is one of the main problems faced by the attacker while testing the query. In MariaDB, SQL injection refers to the stealing of data like private details, bank details, etc from other users without their authorization and it is done by hackers. Read: MariaDB DATEDIFF Function MariaDB Comment SQL injection And selecting only data from a table where dc_id column is greater than or less than 103. As the comment was written – “ Print all data from dc_characters table. */Īs we see in the above query, we have used ‘/*’ opening comment and ‘*/’ closing comment to write an explanation of the query. And selecting only data from table where dc_id column is greater than or less than 103. * Print all data from dc_characters table. The sample example of the comment is given below: SELECT * FROM dc_characters where dc_id>=103 And selecting only dataįrom table where marvel_id column is greater than or less than 205.*/ * Print all data from marvel_characters table. SELECT * FROM Marvel_characters where marvel_id>=205 By using opening ‘/*’ to closing ‘*/’ in this form to span multiple lines. SELECT * FROM USA_HACKER #Selecting all data from usa_hacker table.ģ. By using the ‘#’ sign at the end of the query. The syntax of the comment is given below:ĭROP TABLE USA_HACKER -Dropping the usa_hacker from the database.Ģ. Normally, a MariaDB Comment is used to write for the explanation purpose of a query or the column. Read: MariaDB IF Tutorial MariaDB Comment Syntax ![]() And if we want to check comments then use the SHOW FULL COLUMNS statement. As the above query says, by using ALTER TABLE statement to modify column and adding comment clause to add a comment as “last name of marvel_character”. ![]()
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