CVE-2021-22964 – fastify-static

Package

Manager: npm
Name: fastify-static
Vulnerable Version: >=4.2.4 <4.4.1

Severity

Level: High

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:H

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N

EPSS: 0.00362 pctl0.57543

Details

DOS and Open Redirect with user input ### Impact A redirect vulnerability in the `fastify-static` module allows remote attackers to redirect Mozilla Firefox users to arbitrary websites via a double slash `//` followed by a domain: `http://localhost:3000//a//youtube.com/%2e%2e%2f%2e%2e`. A DOS vulnerability is possible if the URL contains invalid characters `curl --path-as-is "http://localhost:3000//^/.."` The issue shows up on all the `fastify-static` applications that set `redirect: true` option. By default, it is `false`. ### Patches The issue has been patched in `fastify-static@4.4.1` ### Workarounds If updating is not an option, you can sanitize the input URLs using the [`rewriteUrl`](https://www.fastify.io/docs/latest/Server/#rewriteurl) server option. ### References + Bug founder: drstrnegth + [hackerone Report](https://hackerone.com/reports/1361804) ### For more information If you have any questions or comments about this advisory: * Open an issue in [fastify-static](https://github.com/fastify/fastify-static) * Contact the [security team](https://github.com/fastify/fastify/blob/main/SECURITY.md#the-fastify-security-team)

Metadata

Created: 2021-10-12T16:04:17Z
Modified: 2021-10-21T14:57:14Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/10/GHSA-pgh6-m65r-2rhq/GHSA-pgh6-m65r-2rhq.json
CWE IDs: ["CWE-248", "CWE-601"]
Alternative ID: GHSA-pgh6-m65r-2rhq
Finding: F156
Auto approve: 1