Vulnerability · Published Jul 15, 2024 · Assigned by GitHub_M
CVE-2024-39912Enumeration of valid usernames in web-auth/webauthn-lib
Medium 5.3
In plain English
A medium-severity security flaw in webauthn-framework from web-auth. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | web-auth/webauthn-framework | 4.9.0 | GHSA-875x-g8p7-5w27 |
| Packagist | web-auth/webauthn-lib | 4.9.0 | GHSA-875x-g8p7-5w27 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| web-auth | webauthn-framework | >= 4.5.0, < 4.9.0 |
Weakness: CWE-204 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N