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GHSA-7wqh-767x-r66v
No affected components available
Summary
Rack::Static can serve files under the specified root: even if urls: are provided, which may expose other files under the specified root: unexpectedly.
Details
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.
Impact
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.
Mitigation
- Update to the latest version of Rack, or
- Remove usage of
Rack::Static, or - Ensure 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.
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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