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If you keep a record of each client s IP address when their session starts, you can deny any requests that originate from a different IP. That will significantly reduce the threat of session hijacking. The trouble with this technique is that there are legitimate reasons for a client s IP address to change during the course of a session. They might unintentionally disconnect from their ISP and then automatically reconnect a moment later, being assigned a different IP address. Or their ISP might process all HTTP traffic through a set of load-balanced proxy servers, so every request in the session appears to come from a different IP address. You can demand that client IP addresses remain unchanged only in certain corporate LAN scenarios where you know that the underlying network will support it. You should avoid this technique when dealing with the public Internet.

WithDegreeOfParallelism()

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In 2002, Microsoft added a valuable security feature to Internet Explorer: the HttpOnly cookie. Since then, it s been adopted as a de facto standard, supported in Firefox since version 2.0.0.5 (July 2007). The idea is simple: mark a cookie with the HttpOnly flag, and the browser will hide its existence from JavaScript, but will continue to send it in all HTTP requests. That prevents the phone home XSS exploit mentioned previously, while allowing the cookie s intended use for session tracking and authentication by the web server. As a simple rule, mark all your sensitive cookies as HttpOnly unless you have some specific and rare reason to access them from JavaScript on the client. ASP.NET marks ASP.NET_SessionId and .ASPXAUTH as HttpOnly by default, so Forms Authentication is automatically quite well protected. You can apply the flag when you set other cookies as follows: Response.Cookies.Add(new HttpCookie("MyCookie") { Value = "my value", HttpOnly = true }); It s not a complete defense against cookie stealing, because you might still inadvertently expose the cookie contents elsewhere. For example, if you have an error handling page that shows incoming HTTP headers as debugging aids, then a cross-site script can easily force an error and read the cookie values out of the response page.

ForAll()

As with the doubled float-margin bug, it s easy to deduce which elements are the likely culprits with the three-pixel jog. Again, using trial and error, stepping through each likely solution one by one is the best way to solve the problem. In this case, we ll start with .float-wrapper (as the outermost float coming in contact with our third column). As luck would have it, applying the fix to that element (along with the third column) does the trick: /* fix three pixel jog bug */ .float-wrapper { margin-right:-3px; } .third-col { height:1%;margin-left:0; } Two down, one to go.

To see PLINQ in action, create a final Windows Forms application named PLINQDataProcessingWithCancellation and import the System.Threading and System.Threading.Tasks namespaces. This simple form will only need two Button controls named btnExecute and btnCancel. Then the Execute button is clicked, you will fire off a new Task which executes a LINQ query that investigates a very large array of integers, looking for only the items x % 3 == 0 is true. Here is a nonparallel version of the query:

Because XSS gets all the limelight, many web developers don t consider an equally destructive and even simpler form of attack: CSRF. It s such a basic and obvious attack that it s frequently overlooked. Consider a typical web site that allows logged-in members to manage their profile through a controller called UserProfileController: public class UserProfileController : Controller { public ViewResult Edit() { // Display the profile-editing screen var userProfile = GetExistingUserProfile(); return View(userProfile); } [HttpPost] public ActionResult Edit(string email, string hobby) { // Here I'm manually applying the incoming data to a model object // It would work just the same if you used model binding var userProfile = GetExistingUserProfile(); userProfile.Email = email; userProfile.Hobby = hobby; SaveUserProfile(userProfile); return RedirectToAction("Index", "Home"); } private UserProfile GetExistingUserProfile() { /* Omitted */ } private void SaveUserProfile(UserProfile profile) { /* Omitted */ } } Visitors first access the parameterless Edit() action method, which displays their current profile details in a <form>, and then they submit the form to the POST-handling Edit() method. The POSThandling Edit() action method receives the posted data and saves it to the site s database. There is no XSS vulnerability.

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