My question is about what exploits are possible given the following, not how to prevent SQL injection. I would not use this code in a real application.
Using MSSQL Server 2019, imagine a stored procedure for a search that does something like:
DECLARE @keyword varchar(30); -- are there keyword values can cause injection? SET @keyword = REPLACE(@keyword, '''', '^'); DECLARE @sql nvarchar(max) = 'SELECT * FROM Users WHERE REPLACE(Name, '''''', ''^'') LIKE CONCAT(''%'', ''' + @keyword + ''', ''%'')'; EXEC sp_executesql @sql;
Which creates a dynamic sql query by replacing all
^, in the keyword, as well as the column fields.
I don’t know if SQL smuggling is viable because the
REPLACE function will take out ascii and unicode apostrophes.
What attacks, if any, are possible?
P.S. I know using parameterized queries is the only sensible way of preventing sql injection attacks. I’m just curious to see if what techniques can be used to beat this sanitization approach in mssql.
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