CVE-2020-23356 Explained : Impact and Mitigation

Nibbleblog v3.7.1c is vulnerable to a type juggling issue in the login mechanism, allowing for a login bypass due to the mishandling of password hashes.

Understanding CVE-2020-23356

What is CVE-2020-23356?

The vulnerability in Nibbleblog v3.7.1c arises from the use of '==' instead of '===' for password hashes, leading to a type juggling flaw that can be exploited for a login bypass.

The Impact of CVE-2020-23356

This vulnerability allows attackers to bypass the login mechanism by manipulating password hashes, potentially gaining unauthorized access to the system.

Technical Details of CVE-2020-23356

Vulnerability Description

The issue occurs in the 'login.class.php' file of Nibbleblog v3.7.1c, where '==' is used instead of '===' for password hashes, mishandling hashes starting with '0e' followed by only numerical characters.

Affected Systems and Versions

Product: Nibbleblog
Version: 3.7.1c

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting password hashes starting with '0e' followed by exclusively numerical characters to bypass the login authentication.

Mitigation and Prevention

Immediate Steps to Take

Update Nibbleblog to a patched version that addresses the type juggling issue.
Monitor login activities for any suspicious behavior indicating unauthorized access.

Long-Term Security Practices

Implement strong password policies to prevent the use of weak or predictable passwords.
Regularly audit and review the authentication mechanisms for any vulnerabilities.

Patching and Updates

Apply security patches provided by Nibbleblog to fix the type juggling vulnerability and enhance the login security.