CVE-2021-22967 : Vulnerability Insights and Analysis

Concrete CMS (formerly known as concrete5) versions below 8.5.7 are affected by an Insecure Direct Object Reference (IDOR) vulnerability that allows unauthenticated users to access restricted files if allowed to add a message to a conversation. The Concrete CMS security team has assigned this vulnerability a CVSS v3.1 score of 4.3. The vulnerability was discovered by Adrian H.

Understanding CVE-2021-22967

This section provides insights into the details and impact of the CVE-2021-22967 vulnerability.

What is CVE-2021-22967?

CVE-2021-22967 is an IDOR vulnerability in Concrete CMS versions below 8.5.7, enabling unauthorized access to restricted files by unauthenticated users who can add a message to a conversation.

The Impact of CVE-2021-22967

The vulnerability poses a risk of exposing sensitive files to unauthorized users, potentially leading to data breaches and unauthorized information disclosure.

Technical Details of CVE-2021-22967

Here, we delve into the technical aspects of the CVE-2021-22967 vulnerability.

Vulnerability Description

The vulnerability arises from a lack of proper validation when attaching files to a message in the 'add/edit message' feature, allowing users with insufficient permissions to access restricted files.

Affected Systems and Versions

Concrete CMS versions 8.5.6 and below are impacted by this vulnerability, while versions 9.0 and 8.5.7 have been patched to address this issue.

Exploitation Mechanism

Attackers can exploit this vulnerability by manipulating the conversation feature to add a message and gain unauthorized access to restricted files.

Mitigation and Prevention

Discover effective ways to mitigate the CVE-2021-22967 vulnerability and enhance your security posture.

Immediate Steps to Take

Users are advised to update Concrete CMS to the fixed versions 9.0 or 8.5.7 to prevent exploitation of this vulnerability. Restricting access to sensitive files and enforcing proper user permissions can also help mitigate the risk.

Long-Term Security Practices

Implementing regular security audits, educating users on safe practices, and staying informed about security updates can strengthen your overall security posture and prevent future vulnerabilities.

Patching and Updates

Stay vigilant for security patches released by Concrete CMS to address vulnerabilities promptly and ensure that your systems are up to date for improved security.