The attacker tests the identified input field by injecting template syntax specific to the template engine in use. Different web frameworks use different template engines (e.g., Jinja2 for Python, Twig for PHP, or FreeMarker for Java).
There, we discovered a server side template injection vulnerability that allowed us to execute commands on the machine. Using this, we were able to get a shell, read the second flag, and complete the room.
In this section, we'll discuss what server side template injection is and outline the basic methodology for exploiting server side template injection vulnerabilities. We'll also suggest ways of making sure that your own use of templates doesn't expose you to server side template injection.
Server Side Template Injection (SSTI) is a vulnerability that occurs when user input is unsafely incorporated into a server side template, allowing attackers to execute arbitrary code on the server.
Interested in bypassing a system’s security filters using only its built in features? In this article, you will discover unique and advanced techniques for exploiting server side template injections (SSTIs) in various template engines, without relying quotes or external plugins.
LAB Server side template injection with a customer exploit. If website allow us inject the code into template engines, we can manipulate the behavior of the template engines. e.g. Inserting expression invoke the system function. (RCE) Read arbitrary file. 'cache' => ' path to compilation_cache',
Server side template injection (SSTI) is a type of web security vulnerability that can allow attackers to execute arbitrary code on the server that runs an application. This can lead to serious consequences, such as data theft, server compromise, and even full system takeover.
A template engine generates a web page by combining a fixed template with volatile data. Attackers use the server side template injection technique to directly insert user input into templates, allowing them to introduce arbitrary directives that alter the template engine’s behavior.
Template injection is a vulnerability found in web applications that use templates to generate dynamic content. This vulnerability arises when user supplied input is improperly validated and injected into a template, allowing attackers to insert malicious code.
Unsafely embedding user input in templates enables Server Side Template Injection, a frequently critical vulnerability that is extremely easy to mistake for Cross Site Scripting (XSS), or miss entirely.
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