On the whole, HTML5, like other technologies, has its own shortcomings and vulnerabilities.

Research / But the WebSockets protocol lacks built-in authorization and authentication mechanism. How good is JavaScript for Building Large Scale Web Application? Our example above shows this as the postMessage() function uses the wildcard domain: “*”. Required fields are marked *, Pankaj Murthy is an user experience designer for both web and mobile platforms. Download Paper: Hunting postMessage Vulnerabilities Download Sample Code: sample code AppCheck partnered with Sec-1 Ltd (www.sec-1.com) to undertake a research project investigating the security challenges posed by next generation web applications.The project included an investigation of Cross-Origin communication mechanisms provided via HTML5 including postMessage and CORS. But HTML5, like other technologies, has its own pros and cons. For further information about web messaging refer to the specification.For further information about safely using web messaging refer to the OWASP HTML5 Security Cheat Sheet.For more in depth information regarding finding and exploiting vulnerabilities in web messages I recommend the paper Hunting HTML5 postMessage Vulnerabilities from Sec-1/AppCheck. Your email address will not be published. Several studies suggest that HTML5 applications are vulnerable to varying security attacks if the code is not written properly. The project included an investigation of Cross-Origin communication mechanisms provided via HTML5 including postMessage and CORS. e.g. This issue has been known since at least August 2015 when Hengjie opened an Issue on the GitHub repository to notify the project owner (https://github.com/ofirdagan/cross-domain-local-storage/issues/17). An opaque origin is also used for sandboxed documents, data urls, and potentially in other circumstances. Click "OK" in the sender window and observe the post message being received in the popup window which injects malicious JavaScript in the popup window. This means that the attacker will then have access to the contents of web storage and can read and manipulate it as the origin will match. The HTML Standard has introduced a messaging system that allows documents to communicate with each other regardless of their source origin in order to meet this requirement without enabling Cross Site Scripting attacks. This may be a big problem in an organization which have a lot of sub domains and wants to share client data between them.” [sic], “Origins are the fundamental currency of the Web’s security model. In order to exploit this issue an attacker would need to entice a user to load a malicious site, which then interacts with the legitimate client site. But developers often forget to implement Same-Origin Policy (SOP) while using postMessage. article from Mozilla for further information about CORS, Hunting HTML5 postMessage Vulnerabilities, https://developers.google.com/web/tools/chrome-devtools/javascript, line 90 in xdLocalStoragePostMessageApi.js, line 96 in xdLocalStoragePostMessageApi.js, line 63 of xdLocalStoragePostMessageApi.js, https://github.com/ofirdagan/cross-domain-local-storage/issues/17, https://github.com/ofirdagan/cross-domain-local-storage/pull/19, A and B are both tuple origins and their schemes, hosts, and port are identical, Regular expressions which do not escape the wildcard, Regular expressions which do not check the string ends by using the, When sending a message explicitly state the targetOrigin (do not use the wildcard. They can easily prevent CORS attacks by setting value of the Access-Control-Allow-Credentials header as true. Comments.

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