Discovering concrete attacks on website authorization by formal analysis

Social sign-on and social sharing are becoming an ever more popular feature of web applications. This success is largely due to the APIs and support offered by prominent social networks, such as Facebook, Twitter and Google, on the basis of new open standards such as the OAuth 2.0 authorization prot...

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Bibliographic Details
Published in:Journal of computer security 2014-01, Vol.22 (4), p.601-657
Main Authors: Bansal, Chetan, Bhargavan, Karthikeyan, Delignat-Lavaud, Antoine, Maffeis, Sergio
Format: Article
Language:English
Subjects:
API
Applications programs
Computer information security
Computer Science
Concretes
Cryptography and Security
Java (programming language)
Social networks
Websites
Online Access:Get full text
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Summary:Social sign-on and social sharing are becoming an ever more popular feature of web applications. This success is largely due to the APIs and support offered by prominent social networks, such as Facebook, Twitter and Google, on the basis of new open standards such as the OAuth 2.0 authorization protocol. A formal analysis of these protocols must account for malicious websites and common web application vulnerabilities, such as cross-site request forgery and open redirectors. We model several configurations of the OAuth 2.0 protocol in the applied pi-calculus and verify them using ProVerif. Our models rely on WebSpi, a new library for modeling web applications and web-based attackers that is designed to help discover concrete attacks on websites. To ease the task of writing formal models in our framework, we present a model extraction tool that automatically translates programs written in subsets of PHP and JavaScript to the applied pi-calculus. Our approach is validated by finding dozens of previously unknown vulnerabilities in popular websites such as Yahoo and WordPress, when they connect to social networks such as Twitter and Facebook.
ISSN:0926-227X
1875-8924
DOI:10.3233/JCS-140503