medium5.3

CVE-2023-41338

Fiber unauthorized access vulnerability in `ctx.IsFromLocal()`

Impact

### Impact This vulnerability can be categorized as a security misconfiguration. It impacts users of our project who rely on the [ctx.IsFromLocal()](https://docs.gofiber.io/api/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(): ```go // IPs returns a string slice of IP addresses specified in the X-Forwarded-For request header. // When IP validation is enabled, only valid IPs are returned. func (c *Ctx) IPs() []string { return c.extractIPsFromHeader(HeaderXForwardedFor) } ``` Thereby, setting `X-Forwarded-For: 127.0.0.1` in a request from a foreign host, will result in true for [ctx.IsFromLocal()](https://docs.gofiber.io/api/ctx#isfromlocal) ### Patches This issue has been patched in `v2.49.2` with commit [b8c9ede6efa231116c4bd8bb9d5e03eac1cb76dc](https://github.com/gofiber/fiber/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: - [Mozilla Developer Network - X-Forwarded-For](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-For)

Affected packages

Ecosystem	Package	Affected	Fixed in
go	`github.com/gofiber/fiber`	<= 1.14.6	none recorded
go	`github.com/gofiber/fiber/v2`	< 2.49.2	2.49.2

Affected products

Vendor	Product	Affected versions
Gofiber	Fiber	before 2.49.2

Weakness classification

CWE-670