5.3 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
0.001 Low
EPSS
Percentile
26.9%
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():
// 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()
This issue has been patched in v2.49.2
with commit b8c9ede6efa231116c4bd8bb9d5e03eac1cb76dc
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.
For further information and context regarding this security issue, please refer to the following resources:
CPE | Name | Operator | Version |
---|---|---|---|
github.com/gofiber/fiber/v2 | lt | 2.49.2 | |
github.com/gofiber/fiber | le | 1.14.6 |