CVE-2017-6021 Explained : Impact and Mitigation

Schneider Electric ClearSCADA versions 2014 R1, 2014 R1.1, 2015 R1, and 2015 R2 are vulnerable to a specific attack that can lead to server process termination.

Understanding CVE-2017-6021

This CVE involves improper input validation in Schneider Electric ClearSCADA, potentially allowing an attacker to disrupt server processes.

What is CVE-2017-6021?

Prior to the mentioned versions, an attacker with network access can send crafted commands causing server termination, with a CVSS base score of 7.5.

The Impact of CVE-2017-6021

The vulnerability can lead to abrupt termination of the ClearSCADA server process and communication driver processes.

Technical Details of CVE-2017-6021

This section provides in-depth technical insights into the CVE.

Vulnerability Description

The vulnerability stems from improper input validation in ClearSCADA, enabling attackers to disrupt server processes.

Affected Systems and Versions

Product: ClearSCADA
Vendor: Schneider Electric SE
Vulnerable Versions: 2014 R1 (build 75.5210) and prior, 2014 R1.1 (build 75.5387) and prior, 2015 R1 (build 76.5648) and prior, 2015 R2 (build 77.5882) and prior

Exploitation Mechanism

Attackers with network access can send specially crafted commands and data packets to the server, leading to process termination.

Mitigation and Prevention

Protecting systems from CVE-2017-6021 is crucial for maintaining security.

Immediate Steps to Take

Apply security patches provided by Schneider Electric SE promptly.
Implement network segmentation to limit access to critical systems.
Monitor network traffic for any suspicious activities.

Long-Term Security Practices

Conduct regular security assessments and audits of the ClearSCADA system.
Train employees on recognizing and reporting potential security threats.

Patching and Updates

Stay informed about security updates and patches released by Schneider Electric SE.
Regularly update ClearSCADA to the latest version to mitigate known vulnerabilities.