CVE-2019-10936 Explained : Impact and Mitigation

A flaw has been discovered in various Siemens devices, making them vulnerable to a denial of service attack due to mishandling of specially crafted UDP packets.

Understanding CVE-2019-10936

What is CVE-2019-10936?

The vulnerability in Siemens devices allows an attacker to remotely exploit the system without authentication, leading to a denial of service attack.

The Impact of CVE-2019-10936

The vulnerability can result in a denial of service attack on affected Siemens devices, potentially disrupting operations and causing downtime.

Technical Details of CVE-2019-10936

Vulnerability Description

Vulnerability Type: Uncontrolled Resource Consumption
CVSS Score: 7.5 (High)
CVSS Vector: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C

Affected Systems and Versions

Various models of SIMATIC S7-400 CPUs, Development/Evaluation Kits for PROFINET IO, SIMATIC CFU PA, and many more
Specific affected versions listed for each product

Exploitation Mechanism

Attackers can exploit the vulnerability by sending a large number of specially crafted UDP packets to the affected devices, causing a denial of service.

Mitigation and Prevention

Immediate Steps to Take

Apply vendor-supplied patches or updates to mitigate the vulnerability
Implement network segmentation to limit exposure
Monitor network traffic for any signs of exploitation

Long-Term Security Practices

Regularly update and patch all Siemens devices and associated software
Conduct security assessments and penetration testing to identify and address vulnerabilities

Patching and Updates

Siemens has provided patches and updates to address the vulnerability