Decryption sqli dumper
If is replaced by within the body of fnGetCredNumber, I am fairly certain a trace of the SP::StmtCompleted event will not reveal function's T-SQL and its pass phrase.
DECRYPTION SQLI DUMPER CODE
Select * from # output where output is not null drop table # outputĬhanging passphrase variable name to the name : password in the procedure's code can be simply done and is a good practice. Select = ' dir ' + Create table # output ( output varchar ( 255 ) null ) insert # output exec rc = master. Set nocount on declare filepath varchar ( 255 ), cmd varchar ( 255 ), rc int The additional T-SQL Scripts should look somewhat like this :.replace the dirdos command with your executable. It's assumed that your executable reside on c:\temp directory . allow xp_cmdshell option using sp_configure system procedure.
DECRYPTION SQLI DUMPER UPDATE
This can't be done inside my function because function cannot call procedures or executable code that may do update actions.So prior to calling my function, a T-SQL procedure will call xp_cmdshell to his executable, get the decrypted string and use it as an input to the function.I suppose that if the user will bring an executable file that does the decryption of the secret phrase.I'm also thinking that this method is a whole lot less secure than using proper certificates which won't work if you copy them to a different machine. I'm thinking that's going to update ALL the customers' Encrypted_CredCard because there's no WHERE clause. SET Encrypted_CredCard = encryptByPassPhrase (, ) It my be just me but the following code from the encryption proc seems to be missing something really important. The internet is littered with methods to decrypt encrypted procs, etc. Also, depending on supposed encrypted procs is virtually no protection at all. There are too many people with the correct privs to unhide them. I'll also have to add that storing anything in a supposed hidden file or registry entry is a bit crazy. The purpose of this tip it to show a simple way of encryption that is very easy to implement.
I agree that using using certificates is a more secure method. Please be aware that this script is susceptible to injection attacks, and an attacker could leverage bugs like this one for batch injection Additionally, in your comments, you added a script to an xp_cmdshell payload (as I understand, to execute a separate program that would perform the encryption). Another advantage for this option is that these objects can beĮncrypted using the WITH ENCRYPTION option and to further improve the sec SQL Server Encryption Stored procedureģ. The built-in SQL Server ENCRYPTBYPHRASE and DECRYPTBYPASSPHRASE functions in the applicationĬode. T-SQL Scalar UDF for the decryption process is good for generalizing all calls to This method of using a T-SQL stored procedure for the encryption process and a