CVE-2020-15783 : Security Advisory and Response

A vulnerability has been identified in SIMATIC S7-300 CPU family, SIMATIC TDC CPU555, and SINUMERIK 840D sl, allowing for a Denial-of-Service attack on port 102.

Understanding CVE-2020-15783

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

What is CVE-2020-15783?

The vulnerability in SIMATIC S7-300 CPU family, SIMATIC TDC CPU555, and SINUMERIK 840D sl allows attackers to disrupt services by sending specially crafted packets to the affected devices.

The Impact of CVE-2020-15783

Exploiting this vulnerability can result in a Denial-of-Service condition on port 102, requiring a cold restart to restore service.

Technical Details of CVE-2020-15783

This section provides more in-depth technical insights into the CVE.

Vulnerability Description

The vulnerability allows attackers to cause a Denial-of-Service by sending specific packets to the affected Siemens devices.

Affected Systems and Versions

SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants) - All versions
SIMATIC TDC CPU555 - All versions
SINUMERIK 840D sl - All versions

Exploitation Mechanism

Attackers can exploit the vulnerability by sending multiple specially crafted packets to the affected devices, triggering a Denial-of-Service on port 102.

Mitigation and Prevention

Protecting systems from CVE-2020-15783 is crucial to maintaining security.

Immediate Steps to Take

Apply vendor-supplied patches or updates promptly.
Implement network segmentation to limit exposure.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update and patch all software and firmware.
Conduct security assessments and penetration testing.
Educate users and administrators on cybersecurity best practices.

Patching and Updates

Siemens may provide patches or updates to address the vulnerability. Stay informed through official channels for mitigation measures.