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orderid ----------1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ... shipcountry ------------------------------------Customer NRZBB;030-3456789 Customer MLTDN;(5) 789-0123 Customer KBUDE;(5) 123-4567 Customer HFBZG;(171) 456-7890 Customer HGVLZ;0921-67 89 01 Customer XHXJV;0621-67890 Customer QXVLA;67.89.01.23 Customer QUHWH;(91) 345 67 89 Customer RTXGC;23.45.67.89 Customer EEALV;(604) 901-2345 Customer UBHAU;(171) 789-0123 Customer PSNMQ;(1) 890-1234 Customer VMLOG;(5) 456-7890 Customer WNMAF;0452-678901 Customer JUWXK;(11) 012-3456

Imagine you get customer IDs, company names, and phone numbers, and you could request more information! Now the real fun begins as you inject changes and destructive commands for example, suppose you executed the procedure with the following parameter (don t run it):

EXEC GetOrders '-1); UPDATE Sales.Customers SET phone = ''9999999'' WHERE custid = 1; --';

between your application and other systems much looser and enhancing overall architectural flexibility. In addition to its uses in messaging and data translation, XML can also be used as a native data storage format in some situations. It is particularly well suited for managing document repositories and hierarchical data. We examine some of the possibilities in this area in chapter 3.

The code that would run behind the scenes looks like this (don t run it):

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SELECT orderid, shipcountry FROM Sales.Orders WHERE orderid IN(-1); UPDATE Sales.Customers SET phone = '9999999' WHERE custid = 1; --);

To experiment and observe which code strings the stored procedure generates based on various inputs, use a version with a PRINT @sql command instead of EXEC sp_executesql @sql .

An example XML document To illustrate the power and flexibility of XML and related technologies, we need a concrete XML example with which to work. We use this simple document throughout the rest of this chapter to illustrate the use of various XML technologies. Most importantly, we use it to demonstrate the use of the JAX APIs in section 2.2. Listing 2.1 contains an XML instance document, a data structure containing information about a specific catalog of products.

Following are examples for measures you can take to provide some level of protection (though not complete) for your environment against SQL injection attacks:

To reduce the surface area for attack, do not enable functionality that is not needed, such as xp_cmdshell, the SQL Server Agent service, and so on . Provide minimal permissions to the executing user . For example, in the login scenario I presented, there s no reason to connect to the database using a powerful user . Create a user that has access only to the Users table and has no other permissions . This will prevent hackers from modifying data, but they might still be able to read it . In SQL Server 2008, you can impersonate users, so the new credentials will even apply to code invoked dynamically at the server . This opens a whole window of opportunities for hackers . Dynamic SQL can now run under impersonated user credentials and not even require direct permissions from the user executing the stored procedure . Inspect user input thoroughly and use stored procedures . For example, the input to the GetOrders stored procedure should contain only digits and commas . If you inspect the input and find that it contains other characters, don t run the code . Instead, send an alert to notify an administrator of a potential SQL injection attempt:

If other characters are allowed, use pattern matching to check whether common SQL injection constructs such as a single quote, two dashes, EXEC, sp_, xp_, UNION, and so on exist in the input . Note, however, that this technique is not bulletproof because so many attacks are possible .

You can use the arrow keys on the on-screen keyboard to move the insertion point if you need to make corrections.

SKU=123456 and the <product-catalog> name The Product <product sku="123456" name="The Product"> <description locale="en_US"> An excellent product. </description> <description locale="es_MX"> Un producto excellente. </description> Lists descriptions and prices for this product in <price locale="en_US" unit="USD"> the U.S. and Mexico 99.95 </price> <price locale="es_MX" unit="MXP"> 9999.95 </price> </product> </product-catalog>

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