JAVA Como prevenir Directorio Transversal Directory Traversal

Prevenir ataque de directorio transversal
Prevent  Transversal Directory Attack

http://ayudasdesarrollo.blogspot.com/2017/03/owasp-transversaldirectory-java.html


HOLA !, referente a la falla de seguridad OWASP, definida en los siguientes enlaces:

https://www.owasp.org/index.php/Testing_Directory_traversal/file_include_(OTG-AUTHZ-001)
https://en.wikipedia.org/wiki/Directory_traversal_attack

La implementación para prevenir esto en nuestras aplicaciones java WEB es la siguiente:

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author davidandrade
 */
public class RestrictURL implements Filter {

    private FilterConfig fcgConfFiltr_t;

    private static final org.apache.log4j.Logger log = org.apache.log4j.Logger.getLogger(RestrictURL.class.getName());

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        fcgConfFiltr_t = filterConfig;
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) request;
        HttpServletResponse res = (HttpServletResponse) response;
        String strUrlPetici_t = req.getRequestURL().toString();
        String strUrlBase___t = strUrlPetici_t.substring(0, strUrlPetici_t.indexOf(fcgConfFiltr_t.getServletContext().getContextPath()) + fcgConfFiltr_t.getServletContext().getContextPath().length());

        try {

            res.addHeader("X-Frame-Options", "SAMEORIGIN");
            log.info("URL Req: " + strUrlPetici_t);

            if (strUrlPetici_t.toLowerCase().contains("%co") || strUrlPetici_t.toLowerCase().contains("%ae")) {
                sendErrorRedirect(req, res, "/404.jsf", new Exception("DirectoryTransversalRequired"));
            } else {
                try {
                    fcgConfFiltr_t.getServletContext().getRequestDispatcher(strUrlPetici_t).forward(request, response);
                } catch (IllegalArgumentException e) {
                    chain.doFilter(request, response);
                }
            }

        } catch (Exception e) {
            log.error("", e);
            sendErrorRedirect(req, res, "/404.jsf", e);

        }
    }

    protected void sendErrorRedirect(HttpServletRequest request, HttpServletResponse response, String errorPageURL, Throwable e) throws ServletException, IOException {
        request.setAttribute("exception", e);
        fcgConfFiltr_t.getServletContext().getRequestDispatcher(errorPageURL).forward(request, response);
    }

    @Override
    public void destroy() {
        fcgConfFiltr_t = null;
    }

}

Luego en nuestro web.xml lo incluimos respectivamente asi:

<filter>
        <filter-name>DirectoryTransversalFilter</filter-name>
        <filter-class>com.sec.RestrictURL</filter-class> <!-- mandatory -->
    </filter>
    <filter-mapping>
        <filter-name>DirectoryTransversalFilter</filter-name>
        <url-pattern>/*</url-pattern>
<filter-mapping>
</filter-mapping></filter-mapping>


Espero les sirva  yo lo probe con mis URLS y funciono sin problema


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