CVE-2019-13926 Explained : Impact and Mitigation

A vulnerability affecting SCALANCE S602, SCALANCE S612, SCALANCE S623, and SCALANCE S627-2M devices has been identified, allowing attackers to trigger a Denial-of-Service condition on the web server.

Understanding CVE-2019-13926

This CVE involves uncontrolled resource consumption in Siemens SCALANCE devices, potentially leading to a Denial-of-Service attack.

What is CVE-2019-13926?

CVE-2019-13926 is a vulnerability found in SCALANCE S602, SCALANCE S612, SCALANCE S623, and SCALANCE S627-2M devices. By sending specially crafted packets to port 443/tcp, attackers can disrupt the web server, requiring a cold reboot for recovery.

The Impact of CVE-2019-13926

Exploiting this vulnerability can result in a Denial-of-Service situation, rendering the web server non-functional and disrupting normal operations.

Technical Details of CVE-2019-13926

This section provides more technical insights into the vulnerability.

Vulnerability Description

The flaw allows attackers to send manipulated packets to the web server through port 443/tcp, causing a Denial-of-Service scenario and necessitating a cold reboot for device restoration.

Affected Systems and Versions

SCALANCE S602: All versions >= V3.0 and < V4.1
SCALANCE S612: All versions >= V3.0 and < V4.1
SCALANCE S623: All versions >= V3.0 and < V4.1
SCALANCE S627-2M: All versions >= V3.0 and < V4.1

Exploitation Mechanism

Attackers exploit the vulnerability by sending manipulated packets to the web server through port 443/tcp, causing a Denial-of-Service condition.

Mitigation and Prevention

Protecting systems from CVE-2019-13926 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply patches and updates provided by Siemens promptly.
Implement network segmentation to limit the impact of potential attacks.
Monitor network traffic for any suspicious activity targeting port 443/tcp.

Long-Term Security Practices

Regularly update and patch all SCALANCE devices to mitigate known vulnerabilities.
Conduct security assessments and penetration testing to identify and address potential weaknesses.

Patching and Updates

Siemens may release patches to address the vulnerability; ensure timely installation to secure the affected devices.