CVE-2021-31883 : Security Advisory and Response
Understand the impact of CVE-2021-31883 on Siemens products like APOGEE, Desigo, Nucleus, and TALON TC series. Learn about the vulnerability, affected versions, and mitigation steps.
A vulnerability has been identified in several Siemens products, including APOGEE MBC, MEC, PXC, Capital VSTAR, Desigo series, Nucleus NET, ReadyStart, and Source Code, and TALON TC series. The issue arises from DHCP client application's failure to validate the length of Vendor options, potentially leading to Denial-of-Service conditions.
Understanding CVE-2021-31883
This CVE affects multiple Siemens products due to improper handling of DHCP ACK messages, posing a threat of Denial-of-Service.
What is CVE-2021-31883?
The vulnerability in various Siemens products allows malicious actors to exploit DHCP messages, resulting in potential Denial-of-Service attacks on affected systems.
The Impact of CVE-2021-31883
The lack of validation for Vendor option lengths during DHCP message processing can lead to service disruption, affecting the availability of critical systems.
Technical Details of CVE-2021-31883
The vulnerability, categorized under CWE-119, highlights the risk arising from improper restrictions within memory buffer operations.
Vulnerability Description
CVE-2021-31883 exposes Siemens devices to potential Denial-of-Service attacks by failing to verify Vendor option lengths within DHCP messages.
Affected Systems and Versions
Products like APOGEE MBC, MEC, PXC, Capital VSTAR, Desigo series, Nucleus NET, ReadyStart, and Source Code, along with TALON TC series, are impacted by this vulnerability.
Exploitation Mechanism
Malicious actors can potentially exploit this vulnerability by manipulating DHCP ACK messages to disrupt services and trigger Denial-of-Service conditions.
Mitigation and Prevention
To address CVE-2021-31883, immediate actions and long-term security practices are essential to safeguard affected Siemens products.
Immediate Steps to Take
Organizations should apply relevant security patches provided by Siemens promptly to mitigate the risk of Denial-of-Service attacks on vulnerable systems.
Long-Term Security Practices
Implementing secure coding practices, regular security audits, and network monitoring are crucial for enhancing the overall cybersecurity posture.
Patching and Updates
Regularly check for firmware updates and security advisories from Siemens to ensure that the affected products are protected against known vulnerabilities.