CVE-2023-44763 : Security Advisory and Response

Concrete CMS v9.2.1 has been found to be vulnerable to an Arbitrary File Upload flaw through a Thumbnail file upload, leading to a Cross-Site Scripting (XSS) issue.

Understanding CVE-2023-44763

This section delves into the details of the vulnerability, its impact, technical aspects, and mitigation strategies.

What is CVE-2023-44763?

CVE-2023-44763 refers to a security vulnerability in Concrete CMS v9.2.1 that allows attackers to upload arbitrary files via a Thumbnail file upload, resulting in XSS attacks.

The Impact of CVE-2023-44763

This vulnerability can be exploited by malicious actors to upload and execute arbitrary code on the target system, potentially leading to sensitive information exposure or unauthorized system access.

Technical Details of CVE-2023-44763

Let's explore the specifics of the vulnerability

Vulnerability Description

The Arbitrary File Upload vulnerability in Concrete CMS v9.2.1 enables attackers to upload malicious files, such as scripts, that can be executed within the context of the application. This can result in XSS attacks and various forms of system compromise.

Affected Systems and Versions

All instances of Concrete CMS v9.2.1 are impacted by this vulnerability, irrespective of vendor or specific product usage. The default configuration of the system allows for the upload of dangerous file types without proper validation.

Exploitation Mechanism

Attackers can leverage the Thumbnail file upload feature to upload and execute malicious files like scripts, leading to XSS attacks. By circumventing file type restrictions, threat actors can abuse this functionality to compromise the system.

Mitigation and Prevention

Discover the steps to mitigate the risk and secure vulnerable systems

Immediate Steps to Take

To address this vulnerability, users of Concrete CMS v9.2.1 are advised to restrict file upload permissions and validate file types rigorously. Additionally, implementing input sanitization and output encoding can help mitigate the risk of XSS attacks.

Long-Term Security Practices

It is crucial for organizations to stay informed about security updates and patches released by the vendor. Regular security audits, secure coding practices, and user awareness training can bolster the overall security posture.

Patching and Updates

Concrete CMS users should apply the latest security patches provided by the vendor to remediate the Arbitrary File Upload vulnerability. Regularly updating the CMS and monitoring for unusual file uploads can help prevent exploitation of this flaw.