CVE-2019-10954 : Exploit Details and Defense Strategies

An attacker could send crafted SMTP packets to cause a denial-of-service condition where the controller enters a major non-recoverable faulted state (MNRF) in CompactLogix 5370 L1, L2, and L3 Controllers, Compact GuardLogix 5370 controllers, and Armor Compact GuardLogix 5370 Controllers Versions 20 to 30.014 and earlier.

Understanding CVE-2019-10954

This CVE involves a stack-based buffer overflow vulnerability in Rockwell Automation's CompactLogix 5370 controllers, potentially leading to a denial-of-service situation.

What is CVE-2019-10954?

CVE-2019-10954 is a security vulnerability that allows an attacker to exploit CompactLogix 5370 controllers by sending manipulated SMTP packets, causing the controller to enter a major non-recoverable faulted state.

The Impact of CVE-2019-10954

The vulnerability could result in a denial-of-service scenario, disrupting the normal operation of affected controllers and potentially impacting industrial processes.

Technical Details of CVE-2019-10954

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability involves a stack-based buffer overflow in CompactLogix 5370 controllers, triggered by sending crafted SMTP packets.

Affected Systems and Versions

Products: CompactLogix 5370 L1, L2, L3 Controllers, Compact GuardLogix 5370 controllers, Armor Compact GuardLogix 5370 Controllers
Versions: 20 to 30.014 and earlier

Exploitation Mechanism

An attacker can exploit the vulnerability by sending manipulated SMTP packets to the affected controllers, leading to a denial-of-service condition.

Mitigation and Prevention

To address CVE-2019-10954, follow the mitigation and prevention measures outlined below.

Immediate Steps to Take

Apply the latest firmware version (FRN 31.011 or later) provided by Rockwell Automation.
Block traffic to and from outside the Manufacturing Zone by restricting access to specific ports.
Utilize network infrastructure controls like firewalls to block unauthorized SMTP packets.
Refer to product documentation for additional security features.

Long-Term Security Practices

Use trusted software, patches, and antivirus programs.
Minimize network exposure and restrict access to control system devices.
Implement secure remote access methods like VPNs.

Patching and Updates

Stay informed about security advisories and updates from Rockwell Automation.
Regularly update firmware to mitigate risks and enhance security.