Facebook's Ingenious Method to Disable Browser Developer Tools
In the wake of recent social media scams, Facebook has implemented a sophisticated defense mechanism to protect users from malicious activity. As part of this protection, the platform has disabled the browser's integrated Developer Tools, preventing attackers from exploiting them.
One Stack Overflow post asserted the impossibility of blocking Developer Tools client-side. However, Facebook has defied this claim with an innovative solution.
How Facebook Disabled the Developer Tools
The key to Facebook's approach lies in Chrome's reliance on a wrapper function called console._commandLineAPI. This wrapper encloses all console code, providing a potential point of interception.
Facebook engineers redefine console._commandLineAPI to throw an error when accessed. This effectively blocks any attempts to execute code in the Developer Tools console. The following code demonstrates this workaround:
Object.defineProperty(console, '_commandLineAPI',
{ get : function() { throw 'Nooo!' } })Despite its apparent simplicity, this solution is not foolproof. However, it serves as a fundamental building block in Facebook's defense strategy.
Browser Extensions and User-Side JavaScript
Facebook acknowledges the inherent limitations of client-side blocking techniques. Their primary goal is to thwart specific social engineering attacks that trick users into pasting malicious JavaScript into the console.
Chrome's Response
In a surprising turn of events, the Chrome team classified the ability to disable the console from user-side JavaScript as a bug and resolved the issue. This action rendered Facebook's initial technique ineffective.
Additional Protection
Recognizing the vulnerability introduced by the Chrome fix, Facebook implemented additional protections to safeguard users from self-xss attacks. These measures further reinforce the platform's resilience against malicious activities.
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