CVE-2024-39912 Enumeration of valid usernames in web-auth/webauthn-lib

2024-07-1519:38:04

CWE-204

GitHub_M

www.cve.org

cve-2024-39912

username enumeration

web-authn-lib

php

symfony

authentication mechanism

vulnerability

upgrade

CVSS3

5.3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS

Percentile

9.3%

JSON

web-auth/webauthn-lib is an open source set of PHP libraries and a Symfony bundle to allow developers to integrate that authentication mechanism into their web applications. The ProfileBasedRequestOptionsBuilder method returns allowedCredentials without any credentials if no username was found. When WebAuthn is used as the first or only authentication method, an attacker can enumerate usernames based on the absence of the allowedCredentials property in the assertion options response. This allows enumeration of valid or invalid usernames. By knowing which usernames are valid, attackers can focus their efforts on a smaller set of potential targets, increasing the efficiency and likelihood of successful attacks. This issue has been addressed in version 4.9.0 and all users are advised to upgrade. There are no known workarounds for this vulnerability.

CNA Affected

[
  {
    "vendor": "web-auth",
    "product": "webauthn-framework",
    "versions": [
      {
        "version": ">= 4.5.0, < 4.9.0",
        "status": "affected"
      }
    ]
  }
]