GHSA-7rhv-h82h-vpjh

# Vulnerability Allowing MFA Bypass ## Affected EC-CUBE Versions Versions: 4.1.0 – 4.3.1 ## Vulnerability Overview If an administrator’s ID and password are compromised, an issue exists that allows an attacker to bypass the normally required two-factor authentication (2FA) and log in to the administrative interface. ## Severity and Impact **CVSS v3.1 score** Base score: 6.2 / Temporal score: 5.7 / Environmental score (after mitigation and countermeasures): 0.0 An attacker can forcibly overwrite the 2FA configuration of an account with administrative privileges. As a result, the legitimate administrator can be locked out, while the attacker can log in to the administrative interface and perform unauthorized actions such as viewing sensitive information or tampering with the website. ## Root Cause Details There are flaws in the access control implementation for the 2FA settings page (`/admin/two_factor_auth/set`). 1. **TwoFactorAuthListener.php** The route for the 2FA settings page (`admin_two_factor_auth_set`) is included in the list of routes excluded from the 2FA authentication check. 2. **TwoFactorAuthController.php** Even for users who already have 2FA configured, the implementation allows reconfiguration (overwriting) of the 2FA secret key without passing 2FA authentication. ## Attack Preconditions and Steps **Preconditions:** - The attacker knows the administrative user’s ID and password. - 2FA is enabled for that user. **Attack Steps:** 1. Attempt to log in using the ID and password. 2. When the 2FA code entry screen is displayed, do not enter a code; instead, directly modify the URL to access `/admin/two_factor_auth/set`. 3. Because access is not denied, the attacker can generate and save (overwrite) a new 2FA secret key. # MFAバイパスが可能な脆弱性 ## EC-CUBEバージョン バージョン: 4.1.0 ~ 4.3.1 ## 脆弱性の概要 管理者のIDとパスワードが漏洩している場合、本来必要な2段階認証を回避して管理画面にログインできてしまう問題です。 ## 深刻度と影響 CVSS3.1スコア：基本評価:6.2 / 現状評価:5.7 / 環境評価(緩和・対策後):0.0 攻撃者は管理者権限を持つアカウントの2FA設定を