Server Side Template Injection

Remediation

To mitigate the risk of Server Side Template Injection, the following steps can be taken:

1. Input validation: Validate and sanitize all user input before inserting it into templates. This can be done by using a whitelist approach, where only known safe values are allowed, or by using a blacklist approach, where known unsafe values are blocked.

2. Context-aware escaping: Use context-aware escaping to ensure that user input is properly escaped based on its intended use in the template. This can prevent the execution of malicious code.

3. Template engine configuration: Configure the template engine to restrict or disable certain features that can be exploited for code injection. For example, disabling the execution of arbitrary code or limiting the available template tags and filters.

4. Regular updates: Keep the template engine and its dependencies up to date with the latest security patches and updates. This can help protect against known vulnerabilities and exploits.

About

Server Side Template Injection occurs when user input is inserted into a template without proper validation or sanitization, and is then evaluated by the template engine. This can lead to remote code execution, depending on the template engine being used.

Template engines are commonly used in web applications to generate dynamic content by combining templates with data. However, if user input is not properly handled, it can be exploited to inject malicious code into the template, which is then executed by the template engine.

The impact of Server Side Template Injection can vary depending on the template engine and the context in which it is used. In some cases, it can allow an attacker to execute arbitrary code on the server, leading to unauthorized access, data leakage, or even a complete compromise of the system.

Risks

The risks associated with Server Side Template Injection include:

1. Remote code execution: If an attacker is able to inject malicious code into a template, they can potentially execute arbitrary code on the server. This can lead to unauthorized access, data manipulation, or even a complete compromise of the system.

2. Data leakage: Server Side Template Injection can allow an attacker to access sensitive data stored on the server, such as database credentials or user information. This can result in data breaches and privacy violations.

3. Server compromise: By exploiting Server Side Template Injection, an attacker can gain control over the server and use it as a platform for launching further attacks, such as distributing malware or launching phishing campaigns.

It is important to address Server Side Template Injection vulnerabilities to prevent these risks and ensure the security of web applications.