CVE-2017-7898 : Security Advisory and Response

A vulnerability related to excessive authentication attempts has been identified in Rockwell Automation Allen-Bradley MicroLogix programmable-logic controllers.

Understanding CVE-2017-7898

What is CVE-2017-7898?

This CVE identifies an Improper Restriction of Excessive Authentication Attempts issue in Rockwell Automation Allen-Bradley MicroLogix 1100 and 1400 programmable-logic controllers.

The Impact of CVE-2017-7898

The vulnerability allows attackers to perform excessive authentication attempts without consequences, potentially leading to unauthorized access.

Technical Details of CVE-2017-7898

Vulnerability Description

The vulnerability affects specific versions of Rockwell Automation Allen-Bradley MicroLogix 1100 and 1400 controllers, allowing repeated incorrect password entries.

Affected Systems and Versions

Rockwell Automation Allen-Bradley MicroLogix 1100: 1763-L16AWA, Series A and B, Version 16.00 and earlier
Rockwell Automation Allen-Bradley MicroLogix 1400: 1766-L32AWA, Series A and B, Version 16.00 and earlier

Exploitation Mechanism

Attackers can exploit this vulnerability by repeatedly attempting authentication without facing penalties, potentially gaining unauthorized access.

Mitigation and Prevention

Immediate Steps to Take

Implement strong password policies and limit authentication attempts
Monitor and log authentication failures for suspicious activities

Long-Term Security Practices

Regularly update firmware and software to patch known vulnerabilities
Conduct security training for personnel to recognize and report suspicious activities

Patching and Updates

Apply patches and updates provided by Rockwell Automation to address the vulnerability and enhance system security.