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A Symbolic Execution Framework for JavaScript

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6 Author(s)
Prateek Saxena ; EECS Dept., Univ. of California, Berkeley, CA, USA ; Devdatta Akhawe ; Steve Hanna ; Feng Mao
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As AJAX applications gain popularity, client-side JavaScript code is becoming increasingly complex. However, few automated vulnerability analysis tools for JavaScript exist. In this paper, we describe the first system for exploring the execution space of JavaScript code using symbolic execution. To handle JavaScript code’s complex use of string operations, we design a new language of string constraints and implement a solver for it. We build an automatic end-to-end tool, Kudzu, and apply it to the problem of finding client-side code injection vulnerabilities. In experiments on 18 live web applications, Kudzu automatically discovers 2 previously unknown vulnerabilities and 9 more that were previously found only with a manually-constructed test suite.

Published in:

2010 IEEE Symposium on Security and Privacy

Date of Conference:

16-19 May 2010