CVE-2021-3632

Public on

Last Modified: UTC

Description

A flaw was found in Keycloak. This vulnerability allows anyone to register a new security device or key when there is not a device already registered for any user by using the WebAuthn password-less login flow.

A flaw was found in Keycloak. This vulnerability allows anyone to register a new security device or key when there is not a device already registered for any user by using the WebAuthn password-less login flow.

Additional information

  • Bugzilla 1978196: keycloak: Anyone can register a new device when there is no device registered for passwordless login
  • CWE-287: Improper Authentication
  • FAQ: Frequently asked questions about CVE-2021-3632

Common Vulnerability Scoring System (CVSS) Score Details

Important note

CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).

CVSS v3 Score Breakdown
Red HatNVD

CVSS v3 Base Score

7.5

7.5

Attack Vector

Network

Network

Attack Complexity

High

High

Privileges Required

None

None

User Interaction

Required

Required

Scope

Unchanged

Unchanged

Confidentiality Impact

High

High

Integrity Impact

High

High

Availability Impact

High

High

CVSS v3 Vector

Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

NVD: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Red Hat CVSS v3 Score Explanation

AC:H and UI:R, because conditions required to exploit this issue are very unlikely. Considering an attack vector where admin account is being compromised. Attack Complexity : High, as multiple things required to perform the attack : - WebAuthn Passwordless login flow needs to be explicitly enabled and forced for every user. - Attacker needs to know the username or email ID of keycloak admin. User interaction : Required, because either admin need to cancel the registration of his security key in-between or he needs to manually delete the security key/device registered already and leave his account without any security key.

AC:H and UI:R, because conditions required to exploit this issue are very unlikely.

Considering an attack vector where admin account is being compromised.

Attack Complexity : High, as multiple things required to perform the attack :

  • WebAuthn Passwordless login flow needs to be explicitly enabled and forced for every user.
  • Attacker needs to know the username or email ID of keycloak admin.

User interaction : Required, because either admin need to cancel the registration of his security key in-between or he needs to manually delete the security key/device registered already and leave his account without any security key.

Acknowledgements

Red Hat would like to thank Florian Ritterhoff (University of Applied Sciences Munich) for reporting this issue.

Frequently Asked Questions

Why is Red Hat's CVSS v3 score or Impact different from other vendors?

My product is listed as "Under investigation" or "Affected", when will Red Hat release a fix for this vulnerability?

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