Описание
Fiber unauthorized access vulnerability in ctx.IsFromLocal()
Impact
This vulnerability can be categorized as a security misconfiguration. It 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.
In it's implementation it uses c.IPs():
Thereby, setting X-Forwarded-For: 127.0.0.1 in a request from a foreign host, will result in true for ctx.IsFromLocal()
Patches
This issue has been patched in v2.49.2 with commit b8c9ede6efa231116c4bd8bb9d5e03eac1cb76dc
Workarounds
Currently, there are no known workarounds to remediate this vulnerability without upgrading to the patched version. We strongly advise users to apply the patch as soon as it is released.
References
For further information and context regarding this security issue, please refer to the following resources:
Ссылки
- https://github.com/gofiber/fiber/security/advisories/GHSA-3q5p-3558-364f
- https://nvd.nist.gov/vuln/detail/CVE-2023-41338
- https://github.com/gofiber/fiber/commit/b8c9ede6efa231116c4bd8bb9d5e03eac1cb76dc
- https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-For
- https://docs.gofiber.io/api/ctx#isfromlocal
Пакеты
github.com/gofiber/fiber
<= 1.14.6
Отсутствует
github.com/gofiber/fiber/v2
< 2.49.2
2.49.2
Связанные уязвимости
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.