CVE-2023-22853 : Security Advisory and Response

This CVE record, published on January 14, 2023, highlights a vulnerability identified as CVE-2023-22853 in the Tiki platform. The issue pertains to versions prior to 24.1, specifically affecting instances where the feature_create_webhelp is enabled. The vulnerability involves PHP Object Injection in the lib/structures/structlib.php file due to an eval function.

Understanding CVE-2023-22853

In this section, we will delve into the details of CVE-2023-22853, including the vulnerability itself and its potential impacts.

What is CVE-2023-22853?

The CVE-2023-22853 vulnerability in Tiki before version 24.1, triggered when the feature_create_webhelp is activated, can lead to PHP Object Injection through the eval function in the lib/structures/structlib.php file. This essentially allows for an attacker to execute arbitrary PHP code within the platform.

The Impact of CVE-2023-22853

As a result of this vulnerability, threat actors could potentially exploit the PHP Object Injection to inject and execute malicious code within the Tiki platform. This could result in unauthorized access, data manipulation, or even the complete compromise of the affected system.

Technical Details of CVE-2023-22853

This section will outline specific technical aspects of CVE-2023-22853, including the vulnerability description, affected systems, versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability involves PHP Object Injection in the lib/structures/structlib.php file of Tiki versions prior to 24.1, specifically when the feature_create_webhelp is active. The presence of an eval function exacerbates the issue, enabling potential attacks.

Affected Systems and Versions

The CVE-2023-22853 vulnerability impacts Tiki instances running versions earlier than 24.1. Systems with the feature_create_webhelp enabled are particularly susceptible to exploitation through PHP Object Injection.

Exploitation Mechanism

Exploitation of CVE-2023-22853 involves an attacker crafting and injecting malicious PHP code into the vulnerable eval function within the lib/structures/structlib.php file. Through this method, threat actors can execute arbitrary code within the Tiki platform.

Mitigation and Prevention

To safeguard systems against CVE-2023-22853 and similar vulnerabilities, immediate actions, long-term security practices, and patching procedures are essential.

Immediate Steps to Take

Disable the feature_create_webhelp in Tiki configurations if not required to mitigate the risk associated with CVE-2023-22853.
Regularly monitor for any signs of unauthorized PHP code execution or suspicious activities within the platform.

Long-Term Security Practices

Implement secure coding practices to minimize the risk of PHP Object Injection vulnerabilities in web applications.
Conduct regular security assessments and penetration testing to identify and address potential security gaps.

Patching and Updates

Ensure timely updates and patches are applied to the Tiki platform to eliminate known vulnerabilities. It is crucial to stay informed about security advisories and follow recommended mitigation steps to enhance the platform's security posture.