// For flags

CVE-2024-38537

Inclusion of Untrusted polyfill.io Code Vulnerability in fides.js

Severity Score

0.0
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

Fides is an open-source privacy engineering platform. `fides.js`, a client-side script used to interact with the consent management features of Fides, used the `polyfill.io` domain in a very limited edge case, when it detected a legacy browser such as IE11 that did not support the fetch standard. Therefore it was possible for users of legacy, pre-2017 browsers who navigate to a page serving `fides.js` to download and execute malicious scripts from the `polyfill.io` domain when the domain was compromised and serving malware. No exploitation of `fides.js` via `polyfill.io` has been identified as of time of publication. The vulnerability has been patched in Fides version `2.39.1`. Users are advised to upgrade to this version or later to secure their systems against this threat. On Thursday, June 27, 2024, Cloudflare and Namecheap intervened at a domain level to ensure `polyfill.io` and its subdomains could not resolve to the compromised service, rendering this vulnerability unexploitable. Prior to the domain level intervention, there were no server-side workarounds and the confidentiality, integrity, and availability impacts of this vulnerability were high. Clients could ensure they were not affected by using a modern browser that supported the fetch standard.

Fides es una plataforma de ingeniería de privacidad de código abierto. `fides.js`, un script del lado del cliente utilizado para interactuar con las funciones de gestión de consentimiento de Fides, utilizó el dominio `polyfill.io` en un caso límite muy limitado, cuando detectó un navegador heredado como IE11 que no admitía el estándar de recuperación. Por lo tanto, era posible que los usuarios de navegadores heredados anteriores a 2017 que navegaban a una página que servía `fides.js` descargaran y ejecutaran scripts maliciosos desde el dominio `polyfill.io` cuando el dominio estaba comprometido y servía malware. No se ha identificado ninguna explotación de `fides.js` a través de `polyfill.io` al momento de la publicación. La vulnerabilidad ha sido parcheada en la versión `2.39.1` de Fides. Se recomienda a los usuarios que actualicen a esta versión o posterior para proteger sus sistemas contra esta amenaza. El jueves 27 de junio de 2024, Cloudflare y Namecheap intervinieron a nivel de dominio para garantizar que `polyfill.io` y sus subdominios no pudieran resolver el servicio comprometido, haciendo que esta vulnerabilidad no se pudiera explotar. Antes de la intervención a nivel de dominio, no había workarounds en el lado del servidor y los impactos de esta vulnerabilidad en la confidencialidad, integridad y disponibilidad eran altos. Los clientes podían asegurarse de no verse afectados utilizando un navegador moderno que admitiera el estándar de recuperación.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
None
Attack Vector
Network
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
None
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2024-06-18 CVE Reserved
  • 2024-07-02 CVE Published
  • 2024-07-07 First Exploit
  • 2024-08-02 CVE Updated
  • 2025-03-30 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-829: Inclusion of Functionality from Untrusted Control Sphere
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Ethyca
Search vendor "Ethyca"
Fides
Search vendor "Ethyca" for product "Fides"
< 2.39.1
Search vendor "Ethyca" for product "Fides" and version " < 2.39.1"
en
Affected