Reviewers overuse the phrase “required reading,” but no other description fits the new book “Ajax Security” (2007, Addison Wesley, 470p). This exhaustive tome from Billy Hoffman and Bryan Sullivan places the specific security concerns of the Ajax programming model in historical perspective. It demonstrates not only new security threats that are unique to Ajax, but established threats that have gained new traction in the Web 2.0 era. It then details both the specific technical solutions and - more importantly - the mindset that are necessary to combat such threats.
Because so many developers have historically overlooked the importance of security, the authors approach their topic for what it is: a remedial subject. They take pains to explain the basic mechanisms by which hackers have exploited insecure web applications over the last decade: cross-site request forgeries, denial of service attacks, cross-site scripting and SQL injection. Then they explain how those mechanisms have changed thanks to the rise of xmlHttpRequest, public APIs, mash-ups and aggregators. If you’ve ever read a Douglas Crockford rant about the “brokenness” of the web security model and wondered why the guy was such an alarmist, Hoffman and Sullivan are only too happy to provide you with a much-needed wake-up call.
