XSS

Account hijacking using “dirty dancing” in sign-in OAuth-flows

TL;DR Combining response-type switching, invalid state and redirect-uri quirks using OAuth, with third-party javascript-inclusions has multiple vulnerable scenarios where authorization codes or tokens could leak to an attacker. This could be used in attacks for single-click account takeovers. Frans Rosén, Security Advisor at Detectify goes through three different scenarios found in the wild below.

Dissecting the Chrome Extension Facebook malware

TL;DR The Facebook malware that spread last week was dissected in a collaboration with Kaspersky Labs and Detectify. We were able to get help from the involved companies and cloud services to quickly shut down parts of the attack to mitigate it as fast as possible.

A deep dive into AWS S3 access controls – taking full control over your assets

TL;DR: Setting up access control of AWS S3 consists of multiple levels each with its own unique risk of misconfiguration. We will go through the specifics of each level and identify the dangerous cases where weak ACLs can create vulnerable configurations impacting the owner of the S3-bucket and/or through third party assets used by a lot of companies. We also show how to do it properly and how to monitor for these sorts of issues.