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URL Redirection to Untrusted Site ('Open Redirect') in fastify-static

Moderate severity GitHub Reviewed Published Oct 5, 2021 in fastify/fastify-static • Updated Feb 1, 2023

Package

npm fastify-static (npm)

Affected versions

< 4.2.4

Patched versions

4.2.4

Description

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//google.com/%2e%2e.

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 [email protected]

Workarounds

If updating is not an option, you can sanitize the input URLs using the rewriteUrl server option.

References

For more information

If you have any questions or comments about this advisory:

References

@mcollina mcollina published to fastify/fastify-static Oct 5, 2021
Reviewed Oct 5, 2021
Published to the GitHub Advisory Database Oct 5, 2021
Published by the National Vulnerability Database Oct 14, 2021
Last updated Feb 1, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS score

0.170%
(55th percentile)

Weaknesses

CVE ID

CVE-2021-22963

GHSA ID

GHSA-p6vg-p826-qp3v

Source code

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