CVE-2018-11464 : Exploit Details and Defense Strategies

A security flaw has been detected in SINUMERIK 828D V4.7, SINUMERIK 840D sl V4.7, and SINUMERIK 840D sl V4.8, potentially allowing a remote attacker to cause a Denial-of-Service situation for the VNC server.

Understanding CVE-2018-11464

A vulnerability affecting Siemens AG's SINUMERIK products with specific versions.

What is CVE-2018-11464?

This CVE identifies a security flaw in SINUMERIK 828D V4.7, SINUMERIK 840D sl V4.7, and SINUMERIK 840D sl V4.8, related to the integrated VNC server on port 5900/tcp.

The Impact of CVE-2018-11464

The vulnerability could be exploited by a remote attacker to disrupt the VNC server's availability, requiring network access to the affected devices and port.

Technical Details of CVE-2018-11464

Details on the vulnerability and affected systems.

Vulnerability Description

The flaw allows a remote attacker to exploit the VNC server on specific versions of the affected products, potentially leading to a Denial-of-Service scenario.

Affected Systems and Versions

SINUMERIK 828D V4.7: All versions < V4.7 SP6 HF1
SINUMERIK 840D sl V4.7: All versions < V4.7 SP6 HF5
SINUMERIK 840D sl V4.8: All versions < V4.8 SP3

Exploitation Mechanism

The vulnerability can be exploited if port 5900/tcp is intentionally opened in the firewall configuration of network port X130.

Mitigation and Prevention

Steps to address and prevent the vulnerability.

Immediate Steps to Take

Ensure port 5900/tcp is not unnecessarily open in the firewall configuration.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update and patch the affected systems.
Implement network segmentation to limit exposure to potential attacks.

Patching and Updates

Apply the necessary patches provided by Siemens AG to address the vulnerability.