Frame Buster Buster: Defeating the Frame-Busting Resistance
You've implemented anti-framing JavaScript to prevent your site from being embedded within iframes. However, you've discovered a malicious code that can bypass your frame-busting efforts. This issue raises the intriguing question: Can you outsmart the frame-busting buster?
The attacker's code operates by incrementing a counter during page navigation attempts and using a timer to redirect the page to a remote server that responds with HTTP status code 204, effectively preventing navigation.
Defeating the Buster
While the anti-framing code can be bypassed, it is possible to regain control by defeating the counter and timer mechanisms employed by the attacker. Here's how:
Disable onbeforeunload Event
The onbeforeunload event is used by the attacker to increment the counter. To disable it, use:
window.onbeforeunload = null;
Suspend setInterval Timer
To suspend the setInterval timer, utilize the clearInterval function:
var intervalID = setInterval(function() {
// ...
}, 1);
clearInterval(intervalID);
Using X-Frame-Options
For major browsers, using the X-Frame-Options header can prevent framing even with script disabled. For example:
X-Frame-Options: SAMEORIGIN
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