CVE-2023-49955 : What You Need to Know

An issue was discovered in Dalmann OCPP.Core before 1.2.0 for OCPP (Open Charge Point Protocol) for electric vehicles that could lead to a denial of service due to inadequate validation.

Understanding CVE-2023-49955

This article provides insights into the vulnerability identified in Dalmann OCPP.Core before version 1.2.0, potentially resulting in server instability and denial of service attacks.

What is CVE-2023-49955?

CVE-2023-49955 highlights a vulnerability in the OCPP (Open Charge Point Protocol), where the chargePointVendor field's length in a BootNotification message is not properly validated. This oversight could result in severe consequences for the server when processing large inputs.

The Impact of CVE-2023-49955

The vulnerability could lead to server instability and denial of service attacks, creating opportunities for malicious actors to disrupt services and operations.

Technical Details of CVE-2023-49955

This section delves into the specifics of the CVE-2023-49955 vulnerability in Dalmann OCPP.Core.

Vulnerability Description

The issue arises from the lack of validation for the length of the chargePointVendor field in a BootNotification message, allowing for the processing of excessively large inputs without restriction.

Affected Systems and Versions

All versions of Dalmann OCPP.Core before 1.2.0 are affected by this vulnerability, exposing them to potential denial of service attacks.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending oversized inputs in the chargePointVendor field of a BootNotification message, triggering server instability and eventual denial of service.

Mitigation and Prevention

To address CVE-2023-49955 and enhance system security, it is crucial to implement appropriate mitigation strategies.

Immediate Steps to Take

Consider upgrading to version 1.2.0 or above of Dalmann OCPP.Core to eliminate the vulnerability.
Monitor network traffic for any anomalous activity that could indicate exploitation attempts.

Long-Term Security Practices

Regularly update and patch software to ensure the latest security fixes are applied.
Conduct security assessments and penetration testing to identify and address vulnerabilities proactively.

Patching and Updates

Stay informed about security advisories and updates from the Dalmann OCPP.Core project to promptly apply patches and protect against potential threats.