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The trick here is that the hacker closed the quote you opened in front of the user name, added the expression 1=1 which will become part of the filter expression and then added the two dashes (--) to make the rest of the original code (which is now invalid SQL) into a comment so that it won t generate an error . This query will always return a count greater than 0, thereby allowing the hacker to log in without having the right credentials . Note that if you use a member of the sysadmin role or another privileged user to connect to SQL Server and invoke this query, a hacker will be able to do a lot of damage in your system . In addition to gaining the ability to log in, a hacker can inject additional code beyond the original query for example, OR 1 = 1 DROP DATABASE <db_name> - - or OR 1 = 1 EXEC master. dbo.xp_cmdshell format d: - - . Note Note that in SQL Server 2008, xp_cmdshell is disabled by default for security reasons .

Observe that in the plan the Compute Scalar operator calculates a scalar variable called Expr1003 . In the Properties dialog box for this operator you will find that the expression used to assign a value to this variable is: [Expr1003] = Scalar Operator([InsideTSQL2008].[dbo] .[Nums].[n]+(1)) . This is an inline expression that was evaluated as part of the query, and didn t involve any special cost . Note that the first invocation of the code might have had to scan the data physically . Now that the data is loaded into cache, run the query a second time and measure the run time . When I ran this code on my system, it finished in less than a second . Next, create the AddOne scalar UDF:

IF OBJECT_ID('dbo.AddOne', 'FN') IS NOT NULL DROP FUNCTION dbo.AddOne; GO CREATE FUNCTION dbo.AddOne(@i AS INT) RETURNS INT AS BEGIN RETURN @i + 1; END GO

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This appendix contains information about securing your J2EE and XML application from hackers and other unauthorized system users. It contains a detailed discussion of the security risks involved in distributed systems development and the use of cryptography and shared secrets to secure communication among system components.

Now run the query using AddOne:

SELECT n, dbo.AddOne(n) AS n_plus_one FROM dbo.Nums WHERE n <= 1000000;

Observe that also in this plan the Compute Scalar operator calculates a scalar variable called Expr1003 However, if you examine the Properties dialog box for this operator, you will find that the expression that is assigned to the variable is different than in the previous plan: [Expr1003] = Scalar Operator([InsideTSQL2008][dbo][AddOne]([InsideTSQL2008][dbo] [Nums][n])) The difference is that this time you see the call to the AddOne UDF and not the expression n + 1 At first you might not think this makes any difference after all, the query does have an expression that invokes the UDF However, the fact that the UDF call appears in the plan is an indication that the function s expression wasn t inlined in the query .

Passing messages between processes exposes the system to two types of risk. The first is that a third party will intercept a message containing sensitive data. The second is that a third party will falsify a message or alter a valid one before it is delivered to its intended recipient. Both of these risks present potentially serious threats, ranging from loss of system reliability to loss of your competitive advantage. To minimize these risks, communication between processes should be encrypted when appropriate. The cryptographic techniques described in section B.3 are used to do just that.

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