Ssti jinja2 payloads Server-Side Template Injection (SSTI) Payloads These payloads are designed to test for and exploit vulnerabilities in backend template engines, allowing code execution within the template context. Aug 30, 2022 · Exploit the SSTI by calling Popen without guessing the offset Exploit the SSTI by writing an evil config file. To do so, you need to abuse objects that are from the non-sandboxed environment but are accessible from the sandbox. The examples heavily feature Python Jinja2/Flask due to its commonality and the previous context, but the principles apply broadly. To check the class in SSTI jinja2 we can use payload { { (). Oct 24, 2024 · Reverse Shelling via Jinja2 SSTI using ngrok What is SSTI? Server-Side Template Injection (SSTI) is a type of injection attack that targets server-side template engines to execute arbitrary code As the name suggests, server-side template injection payloads are delivered and evaluated server-side, potentially making them much more dangerous than a typical client-side template injection. Join Gus on a deep dive into crafting Jinja2 SSTI payloads from scratch. Different web frameworks use different template engines (e. g. Start with a simple payload like {{ 7*7 }}. This allows them to execute arbitrary commands on the server, potentially leading to unauthorized data access, server compromise, or exploitation of additional vulnerabilities Repository for SSTI (Server-Side Template Injection) cheatsheets, exploits, and essential resources for security research and learning. Indeed the values Web applications often use server-side template technologies and in this example we will use the Jinja2 template engine. \\n Sep 27, 2022 · THE EXECUTION I created a server with an application in flask and jinja2 vulnerable to SSTI for a simple demonstration: Aug 22, 2018 · This post is about Server Side Template Injection (SSTI) and a brief walkthrough of how it can be leverage to get a shell on the server hosting the application. Explore bypass methods and various exploitation techniques in this insightful post. io caused by usage of unsafe functions of Jinja2 allows Remote Command Execution on the server host. Learn how to use automated tools to generate, test, and deploy malicious SSTI payloads. In Python, SSTI can occur when using templating engines such as Jinja2, Mako, or Django templates, where user input is included in templates without proper You Should Know: 1. Common template expressions: {{7*7}} for Jinja2 (Python). Jul 3, 2024 · In Jinja2/Flask it is possible to initialize variables for templates, and deliver payload parts through different methods (i. May 8, 2025 · A critical SSTI vulnerability was discovered in the open-source meal planning application Tandoor Recipes leading to a full system compromise. In Python, SSTI can occur when using templating engines such as Jinja2, Mako, or Django templates, where user input is included in templates without proper sanitization. Sep 10, 2025 · SSTI vulnerabilities in frameworks like Flask (Jinja2) can easily escalate to Remote Code Execution, allowing attackers to steal sensitive information, exfiltrate files, and take full control of servers. A template engine makes designing HTML pages easier by using static template files which at runtime replaces variables/placeholders with actual values in the HTML pages Summary Tools Methodology Identify the Vulnerable Input Field Inject Template Syntax Enumerate Nov 20, 2021 · WEB SECURITY RCE with Server-Side Template Injection Python Flask Application with Jinja2 Template — Doctor HTB machine Server-side template injection is a web application vulnerability that Oct 31, 2021 · This article, inspired by Temple on TryHackMe, demonstrates and dicusses Server-Side Template Injection in Flask and Jinja2. __class__. Understand the core mechanics of Jinja2 Server-Side Template Injection (SSTI) vulnerabilities. 2. Server Side Template Injection Template injection allows an attacker to include template code into an existing (or not) template. Jinja2 is a templating language for Python and is used to generate dynamic HTML rendering. Exploiting SSTI for RCE Once SSTI is confirmed, escalate to RCE using template engine-specific payloads: Jinja2 (Python): What is SSTI (Server-Side Template Injection) Server-side template injection is a vulnerability that occurs when an attacker can inject malicious code into a template that is executed on the server. io version: 0. Server-side Template Injection vulnerabilities (SSTI) occur when user input is embedded in a template in an unsafe manner and results in remote code execution on the server. Contribute to payloadbox/ssti-payloads development by creating an account on GitHub. This payload can contain Jinja template directives that enable the attacker to execute unauthorized code or manipulate the template engine, potentially gaining control over the server. The { {7*7}} should be interpreted and changed to 49 by Jinja2 and Twig engines. Let's consider an example that demonstrates a vulnerable code Aug 26, 2021 · Server-Side Template Injection (SSTI) is a vulnerability that arises when an attacker can inject malicious input into a server-side template, causing arbitrary code execution on the server. First of all, in a Jinja injection you need to find a way to escape from the sandbox and recover access the regular python execution flow. Server-side template injection (SSTI) vulnerabilities occur when trusted user input is added to content that is later processed by a template rendering process. The payload {{bad-stuff-here}} is injected into the name parameter. , GET parameters, HTTP headers, cookies). , Jinja2 for Python, Twig for PHP, or FreeMarker for Java). It allows developers to build HTML pages by combining static layout elements with dynamic data, promoting the separation of application logic and presentation. Find more template expressions in the page dedicated to the technology (PHP, Python, etc). __subclasses__()[396]('cat flag. Details changedetection. Jun 27, 2024 · In this deep dive into Server-Side Template Injection (SSTI) vulnerabilities in Flask (Jinja2), we’ve explored the nuances of how these vulnerabilities arise, their potential impacts, and how to Nov 23, 2020 · What if we have SSTI in the field, which has limited payload size, e. Submit the form with this payload and check if 49 is displayed. - SSTI/Payloads Cheat Sheet. Aug 28, 2017 · The blogpost is a follow-up to my last post about the “Jins2 Template Injection RCE” in the iCTF 2017 “flasking unicorns” service. communicate()[0]. Testing for SSTI To detect SSTI, input mathematical expressions like ` { {77}}` and check if the server evaluates them. Sounds amazing, right? But hold on! With great … Dec 13, 2022 · SSTI, or server-side template injection, happens when attackers use the structure of templates to insert harmful code that is then executed on the server. txt',shell=True,stdout =-1). Jan 26, 2020 · Jinja2 SSTI filter bypasses as you (should) know — blacklists are bad and can often be circumvented. A template engine makes designing . To prevent server-side template injection vulnerabilities, developers should ensure that user input is properly sanitized and validated before Nov 19, 2021 · In order to get access to the underlying Python backend of a web application, an attacker can exploit common vulnerabilities such as Server Side Template Injection (SSTI) or Code Injections (CI Summary Web applications commonly use server-side templating technologies (Jinja2, Twig, FreeMaker, etc. This vulnerability can be found in various technologies, including Jinja. e. To get the working RCE payload, we need to somehow store the parts of the payload persistently to be able to access those parts from the template engine execution namespace. Server Side Template Injection - Python Server-Side Template Injection (SSTI) is a vulnerability that arises when an attacker can inject malicious input into a server-side template, causing arbitrary code execution on the server. Jul 2, 2025 · 1. This time it is about bypassing blacklist filtering approaches by our and other teams as well as some useful tricks. 20 Jun 15, 2025 · TIP! Besides official template documentation, community-powered resources such as Swisskyrepo are an excellent way to find working payloads for all types of injection vulnerabilities, including server-side template injections! Exploiting advanced SSTI vulnerabilities Exploiting template injection vulnerabilities is in most cases straightforward. __class__}} but how about using … This is the core concept that most payloads use in Server Side Template Injections (SSTI) [4] exploits today [3], like this one: 1 {{''. SSTI in Flask/Jinja2 What is SSTI ( Server-Side Template Injection) Server-Side Template Injection is possible when an attacker injects template directive as user input that can execute arbitrary … SSTI in Jinja2 (Python) Theory What is Jinja2? Jinja2 is a popular template engine for Python, widely used in frameworks like Flask. strip()}} This type of payloads can cause various problems because it is highly context dependent. ) to generate dynamic HTML responses. What is the impact of server-side template injection? Jinja2-python-or-flask-SSTI-vulnerability-payload- cheat sheet Jinja2 python or flask SSTI vulnerability payload Server-Side Template Injection (SSTI) vulnerabilities Python internals Breadth first search in Python objects Applying graph theory to find Jinja2 SSTI payloads Using the same technique on the Mako template engine Mar 29, 2022 · jinja2 ssti payload 构造的进一步探究 本文是对 jinja2 ssti payload 的构造方法的进一步探究，力求总结相关 payload 的构造规律，探究 payload 构造细节，并扩大 jinja2 ssti 的攻击面。 Nov 19, 2021 · A talk on optimization of SSTIs payloads in jinja2 to achieve remote code execution, presented at GreHack 2021. Any features that support advanced user-supplied markup may be vulnerable to Mar 17, 2025 · As the title suggests, it is most likely a SSTI (Server Side Template Injection), so I immediately decided to try with Jinja2, since it is the most common, by injecting { { 7*7 }}: Mar 30, 2023 · 现在关于ssti注入的文章数不胜数，但大多数是关于各种命令语句的构造语句，且没有根据版本、过滤等具体细分，导致读者可能有一种千篇一律的感觉。所以最近详细整理了一些SSTI常用的payload、利用思路以及题目，谨以结合题目分析以及自己的理解给uu们提供一些参考，如有写错的地方，还望大佬 Apr 25, 2024 · Summary A Server Side Template Injection in changedetection. mro()[1]. Jinja2 - Filter bypass Jinjava Jinjava - Basic injection Jinjava - Command execution Lessjs Lessjs - SSRF / LFI Lessjs < v3 - Command Execution Plugins Mako Direct access to os from TemplateNamespace: Pebble Pebble - Basic injection Sep 5, 2023 · 💉🐍 Understanding SSTI and Building Payloads in Jinja2 Introduction Imagine having the power to craft stunning dynamic web pages effortlessly. email address which even by RFC3696 has size restrictions. Jinja2 templates are written in a syntax similar to Django's template language, allowing variables Jun 26, 2024 · after that i click on job application and in that i saw a form page type like this: from the description i know it was made in Flask and uses templates rendered by Jinja2. The following payload is used for testing SQL injections, XSS (Cross-Site Scripting) and SSTI (Server-Side Template Injection). Use Jinja2-specific payloads to test for injection. Sep 11, 2025 · A step-by-step walkthrough of solving a Python SSTI challenge on Root-Me, from initial detection to crafting a context-free Jinja2 payload for code execution. Jinja is a popular template engine used in web applications. Aug 14, 2024 · Executive Summary Research by Erez Goldberg Server-Side Template Injection (SSTI) vulnerabilities refer to weaknesses in web applications which attackers can exploit to inject malicious code into server-side templates. Mar 24, 2025 · We provide step-by-step payloads for popular template engines, such as Jinja2, Mako and Twig, that can trigger remote code execution (RCE) on vulnerable systems. 45. #{7*7} for Thymeleaf (Java). md at main · ogtirth/SSTI 🎯 Server Side Template Injection Payloads. plst ozfhk 8tbh nu dz8q71s xsk5 lz siv kqgfmza epvl