Ajax Security by Billy Hoffman

By Billy Hoffman

The Hands-On, functional consultant to combating Ajax-Related defense Vulnerabilities   a growing number of sites are being rewritten as Ajax functions; even conventional computer software program is swiftly relocating to the net through Ajax. yet, all too usually, this transition is being made with reckless forget for defense. If Ajax functions aren’t designed and coded thoroughly, they are often vulnerable to way more risky protection vulnerabilities than traditional net or computing device software program. Ajax builders desperately desire suggestions on securing their functions: wisdom that’s been almost most unlikely to discover, beforehand.             Ajax defense systematically debunks today’s most threatening myths approximately Ajax safety, illustrating key issues with distinctive case reports of tangible exploited Ajax vulnerabilities, starting from MySpace’s Samy bug to MacWorld’s convention code validator. much more very important, it offers particular, up to date ideas for securing Ajax functions in each one significant net programming language and atmosphere, together with .NET, Java, personal home page, or even Ruby on Rails. You’ll the right way to:   ·        Mitigate designated hazards linked to Ajax, together with overly granular internet companies, software keep an eye on stream tampering, and manipulation of software good judgment ·        Write new Ajax code extra safely—and establish and attach flaws in present code ·        hinder rising Ajax-specific assaults, together with JavaScript hijacking and chronic garage robbery ·        steer clear of assaults in response to XSS and SQL Injection—including a perilous SQL Injection version which may extract a complete backend database with simply requests ·        Leverage defense equipped into Ajax frameworks like Prototype, Dojo, and ASP.NET AJAX Extensions—and realize what you continue to needs to enforce by yourself ·        Create safer “mashup” functions   Ajax safeguard could be an vital source for builders coding or keeping Ajax functions; architects and improvement managers making plans or designing new Ajax software program, and all software program defense pros, from QA experts to penetration testers.

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W HAT A JAX I S N OT It is worth noting not just what Ajax is, but what it is not. Most people understand that Ajax is not a programming language in itself, but rather a collection of other technologies. What may be more surprising is that Ajax functionality is not something that necessarily needs to be turned on by the server. It is client-side code that makes the requests and processes the responses. As we will see, client-side code can be easily manipulated by an attacker. In October 2005, the Web site MySpace was hit with a Web virus.

NET Eve quickly locates a function called addEvent, which attaches JavaScript event listeners in a browser-independent way. She searches for all places addEvent is used and sees that it’s used to attach the function checkCoupon to the onblur event for the coupon code text box. This is the function that was called when Eve tabbed out of the coupon field in the form and somehow determined that FREE was not a valid coupon code. The checkCoupon function simply extracts the coupon code entered into the text box and calls isValidCoupon.

The getHttpRequest method creates an XMLHttpRequest object, which is the object that allows the page to make asynchronous requests to the server. If one class could be said to be the key to Ajax, it would be XMLHttpRequest (sometimes abbreviated as XHR). Some of the key properties and methods of XHR are open Specifies properties of the request, such as the HTTP method, to be used and the URL to which the request will be sent. It is worth noting that open does not actually open a connection to a Web server; this is done when the send method is called.

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