CVE-2021-22958 : Security Advisory and Response

A Server-Side Request Forgery vulnerability was found in concrete5 < 8.5.5 that allowed a decimal notation encoded IP address to bypass the limitations in place for localhost, enabling interaction with local services. This vulnerability has a CVSSv2.0 score of AV:A/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N.

Understanding CVE-2021-22958

This section will provide insights into the impact, technical details, and mitigation strategies related to CVE-2021-22958.

What is CVE-2021-22958?

CVE-2021-22958 is a Server-Side Request Forgery vulnerability in concrete5 < 8.5.5 that allows an attacker to interact with local services by manipulating decimal notation encoded IP addresses.

The Impact of CVE-2021-22958

The impact of this vulnerability can vary depending on the services exposed, potentially leading to unauthorized access to sensitive data or services.

Technical Details of CVE-2021-22958

Let's delve deeper into the technical aspects of this vulnerability.

Vulnerability Description

The SSRF vulnerability in concrete5 < 8.5.5 enables threat actors to bypass localhost restrictions by using decimal notation encoded IP addresses, facilitating interaction with local services.

Affected Systems and Versions

The affected version of concrete5 is < 8.5.5.

Exploitation Mechanism

To exploit this vulnerability, attackers can craft malicious requests containing decimal notation encoded IP addresses to interact with local services.

Mitigation and Prevention

Protect your systems from CVE-2021-22958 with these mitigation strategies.

Immediate Steps to Take

Immediately update concrete5 to version 8.5.5 to patch the vulnerability and prevent exploitation.

Long-Term Security Practices

Implement network segmentation, access controls, and regular security updates to enhance your overall security posture.

Patching and Updates

Regularly monitor for security patches and updates from concrete5 to address vulnerabilities and bolster your defenses.