#VU57649 Improper access control in Webauthn Framework - CVE-2021-38299

Vulnerability identifier: #VU57649

Vulnerability risk: High

CVSSv4.0: 8.1 [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/E:U/U:Amber]

CVE-ID: CVE-2021-38299

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Webauthn Framework
Server applications / Frameworks for developing and running applications

Vendor: Web-Authentication

Description

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.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Webauthn Framework: 3.3.0 - 3.3.3

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External links
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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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.