CVE-2023-41338
If exploited, it could allow unauthorized access to resources intended only for localhost.
Does this matter?
Lower severity and a low EPSS score (0.66%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- EPSS
- 0.66% probability · 49th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-670
- Affected
- gofiber/fiber
- Source
- security-advisories@github.com
References
- https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-ForTechnical Description
- https://docs.gofiber.io/api/ctx#isfromlocalProduct
- https://github.com/gofiber/fiber/commit/b8c9ede6efa231116c4bd8bb9d5e03eac1cb76dcPatch
- https://github.com/gofiber/fiber/security/advisories/GHSA-3q5p-3558-364fVendor Advisory
- https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-ForTechnical Description
- https://docs.gofiber.io/api/ctx#isfromlocalProduct
- https://github.com/gofiber/fiber/commit/b8c9ede6efa231116c4bd8bb9d5e03eac1cb76dcPatch
- https://github.com/gofiber/fiber/security/advisories/GHSA-3q5p-3558-364fVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.