CVE-2023-27923 : Security Advisory and Response

This CVE, assigned by jpcert, highlights a cross-site scripting vulnerability found in the Tag edit function of VK Blocks 1.53.0.1 and earlier, as well as VK Blocks Pro 1.53.0.1 and earlier. The vulnerability allows a remote authenticated attacker to inject arbitrary scripts.

Understanding CVE-2023-27923

This section delves into the details of CVE-2023-27923, focusing on its impact and technical aspects.

What is CVE-2023-27923?

CVE-2023-27923 is a cross-site scripting vulnerability that affects VK Blocks and VK Blocks Pro software versions 1.53.0.1 and earlier. This vulnerability enables a remote attacker with authentication to inject and execute arbitrary scripts on the target system.

The Impact of CVE-2023-27923

The impact of this vulnerability is significant as it allows attackers to execute malicious scripts within the context of the affected application. This can lead to various security threats including theft of sensitive information, session hijacking, and unauthorized access to user data.

Technical Details of CVE-2023-27923

In this section, we explore the technical details of CVE-2023-27923, including the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability resides in the Tag edit function of VK Blocks and VK Blocks Pro software versions 1.53.0.1 and earlier. It stems from inadequate input validation, allowing an authenticated attacker to embed malicious scripts into tags, which are then executed in the context of the application.

Affected Systems and Versions

The affected systems include VK Blocks 1.53.0.1 and earlier, as well as VK Blocks Pro 1.53.0.1 and earlier. Users running these versions are at risk of exploitation if the vulnerability is not addressed promptly.

Exploitation Mechanism

To exploit CVE-2023-27923, a remote attacker must be authenticated to the application. By injecting crafted scripts through the Tag edit function, the attacker can bypass security controls and execute malicious code on the target system.

Mitigation and Prevention

This section outlines the necessary steps to mitigate the risks posed by CVE-2023-27923 and prevent future security incidents.

Immediate Steps to Take

Users are advised to update VK Blocks and VK Blocks Pro to versions that contain patches addressing the cross-site scripting vulnerability. Additionally, implementing proper input validation and output encoding can help prevent such attacks in the future.

Long-Term Security Practices

Maintaining regular security audits, staying informed about software vulnerabilities, and educating users on secure coding practices are essential for long-term security resilience against cross-site scripting and other threats.

Patching and Updates

Vektor, Inc. has released patches to fix the vulnerability in VK Blocks and VK Blocks Pro software. Users are strongly encouraged to apply these updates promptly to protect their systems from potential exploitation.