CVE-2021-40102 : Vulnerability Insights and Analysis

Concrete CMS through 8.5.5 is prone to Arbitrary File deletion via PHAR deserialization in is_dir PHP Object Injection.

Understanding CVE-2021-40102

Concrete CMS version 8.5.5 is affected by a vulnerability that allows for Arbitrary File deletion through PHAR deserialization in is_dir function, leading to PHP Object Injection.

What is CVE-2021-40102?

Concrete CMS 8.5.5 vulnerability enables attackers to conduct Arbitrary File deletion using PHAR deserialization in the is_dir function, involving PHP Object Injection.

The Impact of CVE-2021-40102

Attackers can exploit this vulnerability to delete arbitrary files on the system.
It involves PHP Object Injection through PHAR deserialization, posing a significant risk.

Technical Details of CVE-2021-40102

Concrete CMS 8.5.5 vulnerability specifics and technical aspects.

Vulnerability Description

The vulnerability allows for Arbitrary File deletion via PHAR deserialization in the is_dir function, which triggers PHP Object Injection.

Affected Systems and Versions

Product: Concrete CMS
Vendor: Concrete CMS
Versions: up to and including 8.5.5

Exploitation Mechanism

The exploitation involves leveraging PHAR deserialization in the is_dir function to carry out Arbitrary File deletion, exploiting PHP Object Injection.

Mitigation and Prevention

Measures to address and prevent CVE-2021-40102.

Immediate Steps to Take

Update Concrete CMS to a version beyond 8.5.5 to mitigate the vulnerability.
Implement proper input validation to prevent PHP Object Injection.

Long-Term Security Practices

Regularly patch and update Concrete CMS to the latest secure versions.
Conduct security audits and code reviews to identify and rectify vulnerabilities.

Patching and Updates

Concrete CMS users should apply the latest patches and updates provided by the vendor to address CVE-2021-40102.