CVE-2019-6575 : What You Need to Know

A security vulnerability has been discovered in various Siemens products, including SIMATIC CP 443-1 OPC UA, SIMATIC ET 200SP Open Controller CPU 1515SP PC2, SIMATIC HMI Comfort Outdoor Panels, SIMATIC HMI Comfort Panels, SIMATIC HMI KTP Mobile Panels, SIMATIC IPC DiagMonitor, SIMATIC NET PC Software, SIMATIC RF188C, SIMATIC RF600R family, SIMATIC S7-1500 CPU family, SIMATIC S7-1500 Software Controller, SIMATIC WinCC OA, SIMATIC WinCC Runtime Advanced, SINEC NMS, SINEMA Server, SINUMERIK OPC UA Server, and TeleControl Server Basic. This vulnerability can be exploited by sending specially crafted network packets to affected devices on port 4840/tcp, potentially leading to a denial of service or device crash. The attacker does not require system privileges or user interaction for successful exploitation.

Understanding CVE-2019-6575

This section provides insights into the impact and technical details of the CVE.

What is CVE-2019-6575?

The CVE-2019-6575 vulnerability affects multiple Siemens products, allowing remote attackers to disrupt OPC communication or crash devices by exploiting a flaw in network packet handling.

The Impact of CVE-2019-6575

The vulnerability poses a significant risk as attackers can compromise the availability of OPC communication without needing system privileges or user interaction.

Technical Details of CVE-2019-6575

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability arises from a flaw in how affected Siemens products handle network packets, enabling attackers to disrupt OPC communication or crash devices.

Affected Systems and Versions

SIMATIC CP 443-1 OPC UA: All versions
SIMATIC ET 200SP Open Controller CPU 1515SP PC2: All versions < V2.7
SIMATIC HMI Comfort Outdoor Panels: All versions < V15.1 Upd 4
SIMATIC HMI Comfort Panels: All versions < V15.1 Upd 4
SIMATIC HMI KTP Mobile Panels: All versions < V15.1 Upd 4
SIMATIC IPC DiagMonitor: All versions < V5.1.3
SIMATIC NET PC Software V13: All versions
SIMATIC NET PC Software V14: All versions < V14 SP1 Update 14
SIMATIC NET PC Software V15: All versions
SIMATIC RF188C: All versions < V1.1.0
SIMATIC RF600R family: All versions < V3.2.1
SIMATIC S7-1500 CPU family: All versions >= V2.5 < V2.6.1
SIMATIC S7-1500 Software Controller: All versions between V2.5 (including) and V2.7 (excluding)
SIMATIC WinCC OA: All versions < V3.15 P018
SIMATIC WinCC Runtime Advanced: All versions < V15.1 Upd 4
SINEC NMS: All versions < V1.0 SP1
SINEMA Server: All versions < V14 SP2
SINUMERIK OPC UA Server: All versions < V2.1
TeleControl Server Basic: All versions < V3.1.1

Exploitation Mechanism

The vulnerability can be exploited by sending specially crafted network packets to affected devices on port 4840/tcp, allowing remote attackers to disrupt OPC communication or crash the device.

Mitigation and Prevention

Learn how to mitigate the risks associated with CVE-2019-6575.

Immediate Steps to Take

Apply vendor-supplied patches or updates to affected products promptly.
Implement network segmentation to restrict access to critical devices.
Monitor network traffic for any suspicious activity targeting port 4840/tcp.

Long-Term Security Practices

Regularly update and patch all software and firmware to address known vulnerabilities.
Conduct security assessments and penetration testing to identify and remediate weaknesses.
Educate staff on cybersecurity best practices to enhance overall security posture.
Consider implementing intrusion detection and prevention systems to detect and block malicious network traffic.

Patching and Updates

Siemens has released patches for the affected products. Ensure timely installation of these patches to mitigate the vulnerability.