Surf Jacking: HTTPS Will Not Save You
by Sandro Gauci - EnableSecurity - Monday, 11 August 2008.
In this paper we will describe a security issue that affects major web sites and their customers. Attackers exploiting this vulnerability are able to hijack an HTTP session even when the victim and the attacker’s connection is encrypted using SSL or TLS.

We will first describe the components that make up this vulnerability for those who do not have in-depth knowledge of HTTP and HTTPS. If you’re familiar with the HTTP protocol, feel free to skip to the section “underlying protocols”.

EnableSecurity is releasing a tool called surfjack.py which demonstrates the ideas described in this paper. In the section “Proof of Concept” we describe how the tool works and the various options that it supports.

Finally we will describe a simple solution that was successfully applied to two Banks found vulnerable. We shall also discuss why this solution might not be so straightforward to implement in large Single Sign-On services such as Google’s network.

Download the paper in PDF format here.

A video demo of Surf Jacking Gmail can be viewed here.

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