Detecting Malicious JavaScript Code in Mozilla

14 years 4 months ago

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The JavaScript language is used to enhance the clientside display of web pages. JavaScript code is downloaded into browsers and executed on-the-ﬂy by an embedded interpreter. Browsers provide sand-boxing mechanisms to prevent JavaScript code from compromising the security of the client’s environment, but, unfortunately, a number of attacks exist that can be used to steal users’ credentials (e.g., crosssite scripting attacks) and lure users into providing sensitive information to unauthorized parties (e.g., phishing attacks). We propose an approach to solve this problem that is based on monitoring JavaScript code execution and comparing the execution to high-level policies, to detect malicious code behavior. To achieve this goal it is necessary to provide a mechanism to audit the execution of JavaScript code. This is a difﬁcult task, because of the close integration of JavaScript with complex browser applications, such as Mozilla. This paper presents the ﬁrst existing impleme...

Oystein Hallaraker, Giovanni Vigna

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