References to Advisories, Solutions, and Tools

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Change History

File Browser provides a file managing interface within a specified directory and can be used to upload, delete, preview, rename, and edit files. Prior to version 2.55.0, the JSONAuth. Auth function contains a logic flaw that allows unauthenticated attackers to enumerate valid usernames by measuring the response time of the /api/login endpoint. The vulnerability exists due to a "short-circuit" evaluation in the authentication logic. When a username is not found in the database, the function returns immediately. However, if the username does exist, the code proceeds to verify the password using bcrypt (users.CheckPwd), which is a computationally expensive operation designed to be slow. This difference in execution path creates a measurable timing discrepancy. Version 2.55.0 contains a patch for the issue.

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CWE-208

https://github.com/filebrowser/filebrowser/commit/24781badd413ee20333aba5cce1919d676e01889

https://github.com/filebrowser/filebrowser/security/advisories/GHSA-43mm-m3h2-3prc