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I'm working on a web application which is vulnerable to SQL injection in its search box. It uses ASP.Net (C#) and Microsoft SQL Server.
In the search box it queries like:
Select Column1 from TBL where Column2 = N' Here The Search box Content ';
As you can see the above code is completely vulnerable to SQLi.
What I did to mitigate this was just creating a method to replace all
'' which in SQL Server means it is a single quotation.
So if a user enters something like
' order by -- in the textbox the replace function will replace it with
Replace("'","''"); and the SQL Server would never run the attacker's injected SQL.
So I just want to know that am I completely safe against SQLi? Or is there a way to bypass my injection protection?