Benchmark00302.java

/**
 * OWASP Benchmark Project v1.2
 *
 * <p>This file is part of the Open Web Application Security Project (OWASP) Benchmark Project. For
 * details, please see <a
 * href="https://owasp.org/www-project-benchmark/">https://owasp.org/www-project-benchmark/</a>.
 *
 * <p>The OWASP Benchmark is free software: you can redistribute it and/or modify it under the terms
 * of the GNU General Public License as published by the Free Software Foundation, version 2.
 *
 * <p>The OWASP Benchmark is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE. See the GNU General Public License for more details.
 *
 * @author Nick Sanidas
 * @created 2015
 */
package org.owasp.benchmark.testcode;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet(value = "/cmdi-00/Benchmark00302")
public class Benchmark00302 extends HttpServlet {

    private static final long serialVersionUID = 1L;

    /**
     * Sanitize user-controlled input before including it in an OS command. This method removes
     * characters commonly used for command injection.
     */
    private static String sanitizeForCommand(String input) {
        if (input == null) {
            return "";
        }
        // Remove characters that can alter command structure
        return input.replaceAll("[;&|`<>\\r\\n]", "");
    }

    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doPost(request, response);
    }

    @Override
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");

        String param = "";
        java.util.Enumeration<String> headers = request.getHeaders("Benchmark00302");

        if (headers != null && headers.hasMoreElements()) {
            param = headers.nextElement(); // just grab first element
        }

        // URL Decode the header value since req.getHeaders() doesn't. Unlike req.getParameters().
        param = java.net.URLDecoder.decode(param, "UTF-8");

        String bar;

        // Simple ? condition that assigns param to bar on false condition
        int num = 106;

        bar = (7 * 42) - num > 200 ? "This should never happen" : param;

        String cmd = "";
        String osName = System.getProperty("os.name");
        if (osName.indexOf("Windows") != -1) {
            cmd = org.owasp.benchmark.helpers.Utils.getOSCommandString("echo");
        }

        Runtime r = Runtime.getRuntime();

        try {
            String safeBar = sanitizeForCommand(bar);
            Process p = r.exec(cmd + safeBar);
            org.owasp.benchmark.helpers.Utils.printOSCommandResults(p, response);
        } catch (IOException e) {
            System.out.println("Problem executing cmdi - Case");
            response.getWriter()
                    .println(org.owasp.esapi.ESAPI.encoder().encodeForHTML(e.getMessage()));
            return;
        }
    }
}