Scary Beasts Security

NOVEMBER 24, 2008

It's time to write some coherent details about "cookie forcing", which is the name I've given for a new way to attempt to break into secure https sessions. This is surfjacking to the max - attacks an active MITM (man-in-the-middle) can attempt against an https application that follows best practices like marking its cookies secure; avoiding XSS and XSRF; etc.

Wireless 56

Wireless 56

Scary Beasts Security

NOVEMBER 21, 2008

When I talk to a lot of security researchers or paranoid types, it's very common to hear them describe how they very carefully access their bank account or personal GMail etc. Generally, the model used is to launch a separate browser instance, and navigate straight to an https bookmark. The session remains single-window, single-tab. It's a powerful model; the intent is to eliminate the chance of another (http) tab being a vector for owning the browser, or more likely abusing a cross-domain flaw

Banking 50

Banking Accountability 50

Scary Beasts Security

NOVEMBER 18, 2008

Up-front credit to my colleagues Filipe Almeida and Michal Zalewski who led the way in E4X security research. If you haven't heard of E4X, or don't know why Firefox's E4X support should scare you, please consider reading this article. I've just released details for a recently fixed Firefox XML injection bug. It's one of those bugs that is in search of a good exploitation opportunity.

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Scary Beasts Security

NOVEMBER 17, 2008

Here's the first bug with full details from my PacSec presentation. It's fixed in the recent Firefox 2.0.0.18 update. Firefox 3 was never vulnerable. In a nutshell, decent modern browsers permit you to read the pixels from an image by rendering images to a and calling the Javascript APIs getImageData or toDataUrl. Therefore, cross-domain checks are required on the usage of these APIs.

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Scary Beasts Security

NOVEMBER 16, 2008

My recent PacSec presentation (with Billy Rios), entitled "Cross-domain leakiness", is now online. You can view it via this link. There's a new way to attack SSL-enabled web apps in there ("Cookie Forcing"); a bunch of serious browser cross-domain thefts (many not yet disclosed); and attacks against the paranoid one window / one tab browsing model. The slides by themselves are a little sketchy on detail.

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