CVE-2021-26600 : What You Need to Know

ImpressCMS before 1.4.3 has a vulnerability in plugins/preloads/autologin.php leading to type confusion and an Authentication Bypass due to incorrect comparison operators.

Understanding CVE-2021-26600

This CVE refers to a specific security issue in ImpressCMS versions prior to 1.4.3, allowing attackers to bypass authentication using a type confusion vulnerability.

What is CVE-2021-26600?

The vulnerability in plugins/preloads/autologin.php in ImpressCMS before version 1.4.3 results in an authentication bypass due to the misuse of comparison operators, specifically using '!=' instead of '!=='. This flaw can be exploited by malicious actors to gain unauthorized access.

The Impact of CVE-2021-26600

The impact of CVE-2021-26600 is significant as it allows attackers to bypass authentication mechanisms, potentially leading to unauthorized access to sensitive information and compromise of the affected systems.

Technical Details of CVE-2021-26600

The technical details of CVE-2021-26600 highlight the specific aspects related to the vulnerability.

Vulnerability Description

The vulnerability resides in plugins/preloads/autologin.php within ImpressCMS versions before 1.4.3. The incorrect use of the '!=' operator instead of '!==' leads to a type confusion issue, enabling attackers to bypass authentication.

Affected Systems and Versions

All ImpressCMS versions prior to 1.4.3 are affected by this vulnerability. Users with vulnerable installations are at risk of exploitation by malicious entities.

Exploitation Mechanism

Attackers can exploit this vulnerability by leveraging the type confusion in the autologin.php file, allowing them to circumvent the authentication process and gain unauthorized access to the system.

Mitigation and Prevention

To address CVE-2021-26600 and enhance system security, certain mitigation strategies and preventive measures are recommended.

Immediate Steps to Take

Immediately update ImpressCMS to version 1.4.3 or the latest release to patch the vulnerability and prevent exploitation. It is crucial for users to apply security updates promptly.

Long-Term Security Practices

Implementing secure coding practices and conducting regular security audits can help prevent similar vulnerabilities in the future. Emphasize the importance of thorough code reviews and testing.

Patching and Updates

Regularly monitor for security advisories and updates from ImpressCMS to stay informed about the latest patches and releases. Promptly apply any security updates to maintain a secure environment.