CVE-2023-0340 : What You Need to Know

This CVE-2023-0340, titled "Custom Content Shortcode <= 4.0.2 - Contributor+ LFI," was published by WPScan on March 20, 2023. It addresses a vulnerability in the Custom Content Shortcode WordPress plugin that can be exploited by users with a contributor role and above to include arbitrary files via a traversal attack.

Understanding CVE-2023-0340

This section delves into the details of CVE-2023-0340, shedding light on the vulnerability, its impact, technical specifics, and mitigation strategies.

What is CVE-2023-0340?

CVE-2023-0340 concerns a security flaw in the Custom Content Shortcode WordPress plugin version 4.0.2 and below. It arises from the plugin's failure to validate one of its shortcode attributes, enabling unauthorized users to upload arbitrary files and potentially execute remote code.

The Impact of CVE-2023-0340

The vulnerability allows users with contributor privileges or higher to exploit a path traversal attack, enabling them to access unauthorized files and potentially execute remote code on affected systems. This could lead to unauthorized access, data theft, and other malicious activities.

Technical Details of CVE-2023-0340

This section provides a deeper insight into the technical aspects of CVE-2023-0340, including the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The security flaw in the Custom Content Shortcode plugin version 4.0.2 and below stems from the lack of validation in one of its shortcode attributes. This oversight permits users with contributor or higher roles to include arbitrary files via a traversal attack, potentially leading to unauthorized access and remote code execution.

Affected Systems and Versions

The vulnerability impacts systems running the Custom Content Shortcode plugin version 4.0.2 and older. Users of this plugin, particularly those with contributor privileges or higher, are at risk of exploitation through this security gap.

Exploitation Mechanism

Exploiting CVE-2023-0340 involves leveraging the plugin's failure to validate the shortcode attribute, enabling users to upload arbitrary files and potentially execute remote code. Attackers with contributor roles or above could abuse this flaw to gain unauthorized access and compromise the integrity of the affected systems.

Mitigation and Prevention

In response to CVE-2023-0340, it is crucial for users of the Custom Content Shortcode plugin to take immediate action to mitigate the risk and prevent potential exploits. Implementing the following measures is essential:

Immediate Steps to Take

Upgrade to the latest version: Updating the Custom Content Shortcode plugin to a patched version that addresses the vulnerability is essential to mitigate the risk of exploitation.

Long-Term Security Practices

Regular security audits: Conduct routine security audits to identify and address any vulnerabilities in WordPress plugins and themes.

Patching and Updates

Stay informed: Keep track of security advisories and updates for the Custom Content Shortcode plugin to stay protected against known vulnerabilities and exploits.