CVE-2023-2621 Explained : Impact and Mitigation

This CVE-2023-2621 was published by Hitachi Energy on November 1, 2023. The vulnerability is associated with the McFeeder server in the MACH System Software of Hitachi Energy.

Understanding CVE-2023-2621

This CVE identifies an arbitrary file write vulnerability in the McFeeder server that is part of the SSW package. The vulnerability arises from the use of an outdated third-party library for extracting archives uploaded to the McFeeder server. An authenticated malicious client can exploit this vulnerability by uploading a crafted ZIP archive through the network to the McFeeder's service endpoint.

What is CVE-2023-2621?

CVE-2023-2621 is an arbitrary file write vulnerability affecting the McFeeder server in Hitachi Energy's MACH System Software. This vulnerability allows an authenticated attacker to upload a malicious ZIP archive that could result in arbitrary file manipulation on the main computer system.

The Impact of CVE-2023-2621

The impact of CVE-2023-2621 is classified with a CVSSv3.1 base score of 6.5, categorizing it as a medium severity vulnerability. The vulnerability has a low attack complexity, requires low privileges, and can lead to high integrity impact. The exploitation can result in file manipulation, posing a risk to the confidentiality and integrity of the affected system.

Technical Details of CVE-2023-2621

The vulnerability is categorized under CWE-22, which refers to Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal'). The vulnerability is identified by CAPEC-165, which involves file manipulation.

Vulnerability Description

The vulnerability in the McFeeder server allows for arbitrary file write operations on the main computer system. It originates from the utilization of an outdated third-party library for extracting uploaded archives.

Affected Systems and Versions

The vulnerability affects versions of the MACH System Software with a version type of 5.0, specifically versions earlier than 7.17.0.0.

Exploitation Mechanism

An authenticated malicious client can exploit this vulnerability by uploading a specially crafted ZIP archive through the network to the McFeeder server's service endpoint, enabling them to perform arbitrary file write operations.

Mitigation and Prevention

To address CVE-2023-2621, immediate and long-term security measures should be implemented to prevent exploitation and protect the affected systems.

Immediate Steps to Take

Update the McFeeder server and the MACH System Software to versions that are not affected by the vulnerability.
Monitor network traffic for any suspicious activities related to file uploads.
Implement access controls and authentication mechanisms to restrict unauthorized access to the McFeeder server.

Long-Term Security Practices

Conduct regular security audits and vulnerability assessments on the system.
Train employees on secure file upload practices and awareness of potential threats.
Keep software and libraries up-to-date to prevent exposure to known vulnerabilities.

Patching and Updates

Hitachi Energy may release patches or updates to address CVE-2023-2621. It is crucial to apply these patches promptly to mitigate the risk of exploitation and enhance the security posture of the affected systems.