CVE-2019-5421 Explained : Impact and Mitigation

Plataformatec Devise version 4.5.0 and earlier, utilizing the lockable module, contains a vulnerability known as CWE-367 in the

Devise::Models::Lockable

class. This vulnerability allows multiple concurrent requests to prevent an attacker from being blocked on brute force attacks. The exploit can occur via network connectivity. The issue has been resolved in versions 4.6.0 and later.

Understanding CVE-2019-5421

In Plataformatec Devise version 4.5.0 and earlier, a CWE-367 vulnerability in the

Devise::Models::Lockable

class poses a security risk.

What is CVE-2019-5421?

The vulnerability in the

#increment_failed_attempts

method of the

Devise::Models::Lockable

class allows attackers to avoid being blocked during brute force attacks.

The Impact of CVE-2019-5421

Exploiting this vulnerability can lead to multiple concurrent requests preventing an attacker from being blocked during brute force attacks, potentially compromising security.

Technical Details of CVE-2019-5421

Plataformatec Devise version 4.5.0 and earlier using the lockable module is affected by this vulnerability.

Vulnerability Description

The vulnerability lies in the

#increment_failed_attempts

method of the

Devise::Models::Lockable

class.

Affected Systems and Versions

Product: Devise ruby gem
Vendor: Plataformatec
Versions affected: 4.5.0 and earlier using the lockable module

Exploitation Mechanism

Attack Vector: Network connectivity
Exploitable via: Brute force attacks

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent the exploitation of this vulnerability.

Immediate Steps to Take

Upgrade to version 4.6.0 or later of Plataformatec Devise to mitigate the vulnerability.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update software and libraries to the latest versions.
Implement strong password policies and multi-factor authentication.

Patching and Updates

Apply patches and updates provided by Plataformatec to ensure the security of the Devise ruby gem.