Main Vulnerability Database Vulnerabilities #VU57649

Improper access control in Webauthn Framework - CVE-2021-38299

Published: October 26, 2021

Vulnerability identifier: #VU57649

CSH Severity: High

CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-38299

CWE-ID: CWE-284

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to gain unauthorized access to sensitive information.

The vulnerability exists due to improper access restrictions. A remote attacker can login to a vulnerable service using an attached FIDO2 authenticator without passing a check of the user presence.

Affected software

Webauthn Framework
Nextcloud Server

How to mitigate CVE-2021-38299

Install update from vendor's website.

Webauthn Framework - update to 3.3.4
Nextcloud Server - addressed in versions 20.0.13, 21.0.5, 22.2.0

External References

https://github.com/web-auth/webauthn-framework/releases
https://www.fzi.de/en/news/news/detail-en/artikel/fsa-2021-1-fehlende-ueberpruefung-von-user-presence-in-webauthn-framework/

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