CVE-2021-37186 Explained : Impact and Mitigation
Discover the critical vulnerability identified as CVE-2021-37186 in Siemens products. Learn the impact, affected systems, and mitigation strategies for enhanced cybersecurity.
A vulnerability has been identified in LOGO! CMR2020, LOGO! CMR2040, SIMATIC RTU3010C, SIMATIC RTU3030C, SIMATIC RTU3031C, and SIMATIC RTU3041C. The underlying TCP/IP stack flaw allows an adjacent attacker to interfere with traffic, spoof connections, and access sensitive information.
Understanding CVE-2021-37186
This CVE identifies a critical vulnerability in Siemens devices that could lead to unauthorized access and data compromise.
What is CVE-2021-37186?
CVE-2021-37186 discloses a flaw in the random number calculation process of the TCP/IP stack, enabling a LAN-based attacker to manipulate traffic and escalate network access.
The Impact of CVE-2021-37186
The vulnerability poses a severe threat as malicious actors can exploit it to intercept data, forge connections, and potentially steal sensitive information stored on affected devices.
Technical Details of CVE-2021-37186
The following details provide an in-depth look at the vulnerability's technical aspects.
Vulnerability Description
The flaw arises from the improper calculation of random numbers serving as Initial Sequence Numbers (ISNs) within the TCP/IP stack, facilitating unauthorized access and data interception.
Affected Systems and Versions
Siemens products including LOGO! CMR2020, LOGO! CMR2040, SIMATIC RTU3010C, SIMATIC RTU3030C, SIMATIC RTU3031C, and SIMATIC RTU3041C are affected by this vulnerability.
Exploitation Mechanism
An adjacent attacker with access to the LAN interface can exploit this flaw to disrupt traffic patterns, manipulate connections, and potentially exfiltrate sensitive data.
Mitigation and Prevention
To address CVE-2021-37186 and enhance system security, it is crucial to implement the following measures.
Immediate Steps to Take
Ensure that network security protocols are up-to-date, restrict unauthorized access, and monitor network traffic for any irregularities.
Long-Term Security Practices
Regularly update firmware and security patches, conduct security audits, and enforce strong access controls to prevent unauthorized network intrusions.
Patching and Updates
Install the latest security patches provided by Siemens to remediate the vulnerability and strengthen the overall security posture.