Vulnerability CVE-2023-41338
Published: 2023-09-08

Description:
Fiber is an Express inspired web framework built in the go language. Versions of gofiber prior to 2.49.2 did not properly restrict access to localhost. This issue impacts users of our project who rely on the `ctx.IsFromLocal` method to restrict access to localhost requests. If exploited, it could allow unauthorized access to resources intended only for localhost. Setting `X-Forwarded-For: 127.0.0.1` in a request from a foreign host, will result in true for `ctx.IsFromLocal`. Access is limited to the scope of the affected process. This issue has been patched in version `2.49.2` with commit `b8c9ede6`. Users are advised to upgrade. There are no known workarounds to remediate this vulnerability without upgrading to the patched version.

Type:

CWE-670

 (Always-Incorrect Control Flow Implementation)

 References:
https://github.com/gofiber/fiber/security/advisories/GHSA-3q5p-3558-364f
https://docs.gofiber.io/api/ctx#isfromlocal
https://github.com/gofiber/fiber/commit/b8c9ede6efa231116c4bd8bb9d5e03eac1cb76dc
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-For
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