CVE-2023-5966 Explained : Impact and Mitigation

This CVE-2023-5966 involves an unrestricted upload of a file with a dangerous type vulnerability in EspoCRM.

Understanding CVE-2023-5966

This vulnerability allows an authenticated privileged attacker to upload a specially crafted zip file to the EspoCRM server, specifically affecting version 7.2.5. This upload is done via the extension deployment form and could potentially lead to arbitrary PHP code execution.

What is CVE-2023-5966?

The CVE-2023-5966 vulnerability in EspoCRM enables an attacker with high privileges to upload a malicious zip file that, when processed by the server, can execute arbitrary PHP code. This can have severe consequences for the security and integrity of the affected system.

The Impact of CVE-2023-5966

The impact of CVE-2023-5966 is rated as critical with a base score of 9.1 according to the CVSS v3.1 metrics. The confidentiality, integrity, and availability of the system are all at high risk due to the potential execution of arbitrary PHP code by an attacker with high privileges.

Technical Details of CVE-2023-5966

This vulnerability is classified under CWE-434 - Unrestricted Upload of File with Dangerous Type. It has a CVSS v3.1 base severity rating of CRITICAL due to the high impact on the affected system.

Vulnerability Description

The vulnerability allows an authenticated privileged attacker to upload a specially crafted zip file to the EspoCRM server, leading to potential arbitrary PHP code execution.

Affected Systems and Versions

EspoCRM version 7.2.5 is affected by this vulnerability.

Exploitation Mechanism

An attacker with high privileges can exploit this vulnerability by uploading a malicious zip file through the extension deployment form, enabling them to execute arbitrary PHP code on the server.

Mitigation and Prevention

To mitigate the risks associated with CVE-2023-5966, immediate action and long-term security practices are essential.

Immediate Steps to Take

Users can restrict the exploitation of this vulnerability by enabling the "restrictedMode" option in the configuration menu. It is crucial to apply this configuration change promptly to prevent unauthorized code execution.

Long-Term Security Practices

Regular security assessments, code reviews, and access control management are important long-term security practices to prevent and detect similar vulnerabilities in the future.

Patching and Updates

Staying informed about security updates and patches released by EspoCRM is crucial. It is recommended to promptly apply any security patches to address known vulnerabilities and enhance the overall security posture of the system.