Server-Side Template Injection Vulnerability Analysis

This technical report discusses the critical vulnerability of Server-Side Template Injection (SSTI) in web applications, which can lead to Remote Code Execution (RCE). It outlines the methodology for detecting and exploiting this vulnerability, highlighting how improper handling of user input in template engines can expose web servers to attacks. The report details the process of identifying vulnerable template engines, including popular ones like FreeMarker and Twig, and presents case studies demonstrating the exploitation of SSTI in widely used enterprise applications. It emphasizes the importance of understanding the context in which template injection can occur, whether through developer error or intentional user input. The report also covers mitigation strategies and best practices for developers to prevent SSTI, stressing the need for secure coding practices and awareness of the risks associated with user-supplied templates. The findings underscore the necessity for thorough security assessments of web applications that utilize template engines.