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Why is it important to protect client side JavaScript?
Just like anyone can use the debugging tool for legitimate purposes, an attacker can use this feature to change JavaScript at runtime. The attacker can hit a breakpoint, change the DOM and enter arbitrary JavaScript in the console. This kind of attack can be used to exploit possible security flaws on the client-side.
What should I do on the client side?
Do everything client-side that doesn’t affect anyone else if the user tampers with it. In particular, that means graphical effects. Do everything server-side that needs to be secure, and just send UI events from the client (eg. then client just says “the user tapped the Buy button” while the server actually carries out the transaction).
Who is in control of the client computer?
Assume that the client computer and all software running on it is under complete control of a clever malicious hacker.
Can a server analyze the Code of a Minecraft client?
Allow servers to analyze the code of the client used by players for determine whether or not they use unfair modifications. If Badlion client and cheatbreaker client can, why Mojang/Microsoft can not?
What are the risks of JavaScript powered applications?
This is precisely the case of JavaScript-powered applications, where these risks can be leveraged in the form of various attacks such as intellectual property theft, automated abuse, piracy, and data exfiltration. (For more details on these key business risks, see our blog post on “ Enterprise JavaScript: Opportunities, Threats, Solutions ”.)
When to use document.close in JavaScript?
Due to the scoping of static objects in JavaScript, a call to close()without specifying an object name is equivalent to document.close(). For the same reason, when you refer to the locationobject within an event handler, you must specify window.locationinstead of simply using location.