CVE-2023-41338: Github.com/gofiber/fiber Fiber Unauthorized Access Vulnerability Vulnerability
MODERATECVE-2023-41338 is a MODERATE (CVSS 5.3) fiber unauthorized access vulnerability vulnerability (CWE-670: Always-Incorrect Control Flow Implementation) affecting Github.com/gofiber/fiber libraries in the Go ecosystem. The issue involves fiber unauthorized access vulnerability in `ctx.isfromlocal()`. Remediation is available by upgrading affected packages to version 2.49.2.
CVE-2023-41338 at a Glance
Security Impact
CVSS: 5.3
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).
How to Fix CVE-2023-41338
To remediate this vulnerability, upgrade all affected Github.com/gofiber/fiber dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade github.com/gofiber/fiber to Latest secure releaseUpgrade github.com/gofiber/fiber/v2 to 2.49.2Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for github.com/gofiber/fiberHow to Check if You Are Affected
To determine whether your application is affected by CVE-2023-41338, inspect your project dependencies for Github.com/gofiber/fiber:
inspect dependencies for github.com/gofiber/fiberAnalyze the terminal output to locate any version of Github.com/gofiber/fiber in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.49.2), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-670: Always-Incorrect Control Flow Implementation, where the code contains a control flow path that does not reflect the algorithm that the path is intended to implement, leading to incorrect behavior any time this path is navigated. In Github.com/gofiber/fiber, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2023-41338 Affected Github.com/gofiber/fiber Versions
2 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
github.com/gofiber/fiber
|
Go |
≤ 1.14.6
|
|
|
github.com/gofiber/fiber/v2
|
Go |
< 2.49.2
|
2.49.2
|
References
Frequently Asked Questions
What is CVE-2023-41338?
Which Github.com/gofiber/fiber versions are affected?
What version fixes CVE-2023-41338?
Is github.com/gofiber/fiber affected?
Is github.com/gofiber/fiber/v2 affected?
What is the CVSS score of CVE-2023-41338?
What CWE is associated with CVE-2023-41338?
How can I check Go dependencies for CVE-2023-41338?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-3q5p-3558-364f",
"modified" : "2023-09-11T14:39:57Z",
"published" : "2023-09-08T13:27:21Z",
"aliases" : [ "CVE-2023-41338" ],
"summary" : "Fiber unauthorized access vulnerability in `ctx.IsFromLocal()`",
"details" : "### Impact\nThis 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.\n\nIn it's implementation it uses c.IPs():\n\n```go\n// IPs returns a string slice of IP addresses specified in the X-Forwarded-For request header.\n// When IP validation is enabled, only valid IPs are returned.\nfunc (c *Ctx) IPs() []string {\n return c.extractIPsFromHeader(HeaderXForwardedFor)\n}\n```\n\nThereby, 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) \n\n### Patches\nThis issue has been patched in `v2.49.2` with commit [b8c9ede6efa231116c4bd8bb9d5e03eac1cb76dc](https://github.com/gofiber/fiber/commit/b8c9ede6efa231116c4bd8bb9d5e03eac1cb76dc)\n\n### Workarounds\nCurrently, 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.\n\n### References\nFor further information and context regarding this security issue, please refer to the following resources:\n\n- [Mozilla Developer Network - X-Forwarded-For](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-For)\n\n",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/gofiber/fiber"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"last_affected" : "1.14.6"
} ]
} ]
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/gofiber/fiber/v2"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "2.49.2"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/gofiber/fiber/security/advisories/GHSA-3q5p-3558-364f"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2023-41338"
}, {
"type" : "WEB",
"url" : "https://github.com/gofiber/fiber/commit/b8c9ede6efa231116c4bd8bb9d5e03eac1cb76dc"
}, {
"type" : "WEB",
"url" : "https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-For"
}, {
"type" : "WEB",
"url" : "https://docs.gofiber.io/api/ctx#isfromlocal"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/gofiber/fiber"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-670" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2023-09-08T13:27:21Z",
"nvd_published_at" : "2023-09-08T19:15:43Z"
}
}