CVE-2018-11457 : Vulnerability Insights and Analysis

A security flaw has been discovered in SINUMERIK 828D V4.7, SINUMERIK 840D sl V4.7, and SINUMERIK 840D sl V4.8, affecting Siemens AG products.

Understanding CVE-2018-11457

What is CVE-2018-11457?

A vulnerability in the integrated web server on port 4842/tcp of the affected products could allow unauthorized code execution with elevated permissions.

The Impact of CVE-2018-11457

Unauthorized individuals could execute code with elevated permissions by sending crafted network requests to port 4842/tcp.
Successful exploitation could compromise the integrity, confidentiality, and availability of the web server.
No known instances of public exploitation at the time of advisory publication.

Technical Details of CVE-2018-11457

Vulnerability Description

The vulnerability allows attackers to execute code with elevated permissions on the system through the integrated web server on port 4842/tcp.

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

Attackers can exploit the flaw by sending carefully crafted network requests to port 4842/tcp.
Vulnerability can be exploited if port 4842/tcp is intentionally opened in the firewall configuration of network port X130.

Mitigation and Prevention

Immediate Steps to Take

Close port 4842/tcp if not required for operation.
Apply the recommended security updates provided by Siemens AG.

Long-Term Security Practices

Regularly monitor and update firewall configurations.
Implement network segmentation to limit access to critical ports.

Patching and Updates

Ensure all affected systems are updated to the latest versions provided by Siemens AG.