Template engines are a type of software used to determine the appearance of a web page. Developers often overlook attacks that target these engines, called server-side template injections (SSTIs), yet they can lead to severe consequences, like remote code execution. They have become more common in the past few years, with instances found in the applications of organizations such as Uber and Shopify.
In this chapter, we’ll dive into the mechanisms of this vulnerability by focusing on web applications using the Jinja2 template engine. After confirming that we can submit template injections to the application, we’ll take ...
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