CVE-2019-5440: Weak RNG
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.
Affected Software
Event History
Frequently Asked Questions
What is the vulnerability ID of this issue?
The vulnerability ID of this issue is CVE-2019-5440.
What is the severity of CVE-2019-5440?
The severity of CVE-2019-5440 is high, with a severity value of 8.1.
Which version of Revive Adserver is affected by CVE-2019-5440?
Revive Adserver version up to exclusive 4.2.1 is affected by CVE-2019-5440.
What is the potential impact of CVE-2019-5440?
CVE-2019-5440 could allow an attacker to bypass authentication if they exploit the password recovery functionality.
Are there any references or additional resources for CVE-2019-5440?
Yes, you can find more information about CVE-2019-5440 at the following link: https://hackerone.com/reports/576504