CVE-2025-27610
Local File Inclusion in Rack::Static
In short
Rack::Static, a Ruby web framework component, has a flaw that allows attackers to access files outside the intended public directory by using path traversal tricks in URLs. This exposes sensitive files that should have been protected.
Technical detail
CVE-2025-27610 is a Local File Inclusion vulnerability in Rack::Static prior to versions 2.2.13, 3.0.14, and 3.1.12, where encoded path traversal sequences bypass path sanitization, allowing unauthenticated attackers to read arbitrary files within the configured root directory. The vulnerability stems from improper validation of user-supplied paths before file serving, with the attack requiring only knowledge of the target file path.
Summary generated and translated by AI from the official description.
Rack provides an interface for developing web applications in Ruby. Prior to versions 2.2.13, 3.0.14, and 3.1.12, `Rack::Static` can serve files under the specified `root:` even if `urls:` are provided, which may expose other files under the specified `root:` unexpectedly. The vulnerability occurs because `Rack::Static` does not properly sanitize user-supplied paths before serving files. Specifically, encoded path traversal sequences are not correctly validated, allowing attackers to access files outside the designated static file directory. By exploiting this vulnerability, an attacker can gain access to all files under the specified `root:` directory, provided they are able to determine then path of the file. Versions 2.2.13, 3.0.14, and 3.1.12 contain a patch for the issue. Other mitigations include removing usage of `Rack::Static`, or ensuring that `root:` points at a directory path which only contains files which should be accessed publicly. It is likely that a CDN or similar static file server would also mitigate the issue.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected products
rack · rackWant to know if your infrastructure is exposed to this?
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