CVE-2018-7791 Explained : Impact and Mitigation

Schneider Electric's Modicon M221 product has a vulnerability related to Permissions, Privileges, and Access Control, affecting all references and versions prior to firmware V1.6.2.0. This vulnerability enables unauthorized individuals to replace the original password with their own, granting them the ability to upload the original program from the Programmable Logic Controller (PLC).

Understanding CVE-2018-7791

This CVE entry pertains to a security vulnerability in Schneider Electric's Modicon M221 product.

What is CVE-2018-7791?

CVE-2018-7791 is a Permissions, Privileges, and Access Control vulnerability in Modicon M221, allowing unauthorized users to overwrite the original password and potentially upload the PLC's original program.

The Impact of CVE-2018-7791

The vulnerability poses a significant risk as it could lead to unauthorized access and manipulation of the PLC's program, compromising the integrity and security of industrial control systems.

Technical Details of CVE-2018-7791

This section provides detailed technical information about the CVE.

Vulnerability Description

The vulnerability in Modicon M221 allows attackers to replace the original password with their own, granting them unauthorized access to the PLC's program.

Affected Systems and Versions

Product: Modicon M221, all references
Versions Affected: All versions prior to firmware V1.6.2.0

Exploitation Mechanism

Attackers exploit the vulnerability to overwrite the original password, gaining unauthorized access to the PLC's program.

Mitigation and Prevention

Protecting systems from CVE-2018-7791 requires immediate action and long-term security practices.

Immediate Steps to Take

Update the Modicon M221 firmware to version V1.6.2.0 or later to mitigate the vulnerability.
Implement strong password policies and access controls to prevent unauthorized access.

Long-Term Security Practices

Regularly monitor and audit access to the PLC to detect any unauthorized changes.
Train employees on cybersecurity best practices to enhance overall system security.

Patching and Updates

Stay informed about security updates and patches released by Schneider Electric to address vulnerabilities like CVE-2018-7791.