Cryptographically Weak PRNG in Password Recovery Token Generation of Revive Adserver

CVE-2019-5440 · MEDIUM Severity

AV:N/AC:M/AU:N/C:P/I:P/A:P

Use of cryptographically weak PRNG in the password recovery token generation of Revive Adserver < v4.2.1 causes a potential authentication bypass attack if an attacker exploits the password recovery functionality. In lib/OA/Dal/PasswordRecovery.php, the function generateRecoveryId() generates a password reset token that relies on the PHP uniqid function and consequently depends only on the current server time, which is often visible in an HTTP Date header.

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