Enumeration of valid usernames in web-auth/webauthn-lib

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.

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

响应差异性信息暴露

Webauthn Framework 安全漏洞

Webauthn Framework是Web-Authentication开源的一个身份验证机制。用于 Web 应用程序创建和使用强大的、经过证明的、有范围的、基于公钥的凭证，以便对用户进行强身份验证。 Webauthn Framework存在安全漏洞，该漏洞源于在该认证组件没有检索到输入的用户名时，会返回一个 allowedCredentials。攻击者利用该漏洞可以检索有效的用户名。

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