GHSA-5pv8-ppvj-4h68

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    GHSA-5pv8-ppvj-4h68

    Published: 13 May 2021Last Modified: 10 Sept 2026

    Summary: Prevent user enumeration using Guard or the new Authenticator-based Security

    Details: Description ----------- The ability to enumerate users was possible without relevant permissions due to different exception messages depending on whether the user existed or not. It was also possible to enumerate users by using a timing attack, by comparing time elapsed when authenticating an existing user and authenticating a non-existing user. Resolution ---------- We now ensure that 403s are returned whether the user exists or not if the password is invalid or if the user does not exist. The patch for this issue is available [here](https://github.com/symfony/symfony/commit/2a581d22cc621b33d5464ed65c4bc2057f72f011) for branch 3.4. Credits ------- I would like to thank James Isaac and Mathias Brodala for reporting the issue and Robin Chalas for fixing the issue.

    References: https://github.com/symfony/symfony/security/advisories/GHSA-5pv8-ppvj-4h68, https://nvd.nist.gov/vuln/detail/CVE-2021-21424, https://github.com/symfony/symfony/commit/2a581d22cc621b33d5464ed65c4bc2057f72f011, https://symfony.com/cve-2021-21424, https://lists.fedoraproject.org/archives/list/[email protected]/message/VRUS2H2SSOQWNLBD35SKIWIDQEMV2PD3, https://lists.fedoraproject.org/archives/list/[email protected]/message/UC7BND775DVZDQT3RMGD2HVB2PKLJDJW, https://lists.fedoraproject.org/archives/list/[email protected]/message/RH7TMM5CHQYBFFGXWRPJDPB3SKCZXI2M, https://lists.fedoraproject.org/archives/list/[email protected]/message/KENRNLB3FYXYGDWRBH2PDBOZZKOD7VY4, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VRUS2H2SSOQWNLBD35SKIWIDQEMV2PD3, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UC7BND775DVZDQT3RMGD2HVB2PKLJDJW, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RH7TMM5CHQYBFFGXWRPJDPB3SKCZXI2M, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KENRNLB3FYXYGDWRBH2PDBOZZKOD7VY4, https://lists.debian.org/debian-lts-announce/2023/07/msg00014.html, https://github.com/symfony/symfony, https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2021-21424.yaml, https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security/CVE-2021-21424.yaml, https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-http/CVE-2021-21424.yaml, https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/security-guard/CVE-2021-21424.yaml, https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/maker-bundle/CVE-2021-21424.yaml, https://github.com/FriendsOfPHP/security-advisories/blob/master/lexik/jwt-authentication-bundle/CVE-2021-21424.yaml

    Affected packages

    Package

    Name: symfony/security

    Purl: pkg:composer/symfony/security

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 5.0.0
    Fixed -5.2.8

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    GHSA-5pv8-ppvj-4h68 | CVE-DB