CVE-2021-31887 : Vulnerability Insights and Analysis
Learn about CVE-2021-31887, a Siemens product vulnerability leading to stack-based buffer overflows due to improper FTP server command validation, enabling Denial-of-Service and Remote Code Execution.
A vulnerability has been identified in several Siemens products which allows for stack-based buffer overflows due to improper validation of the length of the "PWD/XPWD" command. This vulnerability can lead to Denial-of-Service conditions and Remote Code Execution.
Understanding CVE-2021-31887
This CVE impacts various Siemens products by enabling stack-based buffer overflows through FTP server's inadequate validation of commands.
What is CVE-2021-31887?
A security flaw in Siemens products allows attackers to trigger buffer overflows using the "PWD/XPWD" command, potentially resulting in DoS and RCE.
The Impact of CVE-2021-31887
The vulnerability can lead to severe consequences, including denial of service and the execution of arbitrary remote code on affected systems.
Technical Details of CVE-2021-31887
This section details the specific technical aspects related to the CVE.
Vulnerability Description
The vulnerability arises from the FTP server's failure to properly validate the length of the "PWD/XPWD" command, opening the door to stack-based buffer overflows.
Affected Systems and Versions
Multiple Siemens products are affected, including APOGEE MBC, APOGEE MEC, APOGEE PXC, Desigo PXC, Desigo PXM, Nucleus NET, Nucleus ReadyStart, Nucleus Source Code, TALON TC Compact, and TALON TC Modular.
Exploitation Mechanism
Exploitation involves sending specially crafted commands to the FTP server, taking advantage of the improper validation to overflow the buffer.
Mitigation and Prevention
Discover how to address and prevent the CVE’s impact on affected systems.
Immediate Steps to Take
Users should apply patches or updates provided by Siemens to fix the vulnerability and prevent potential exploitation.
Long-Term Security Practices
Incorporate secure coding practices, network segmentation, and regular security assessments to enhance the overall security posture.
Patching and Updates
Regularly check for security updates from Siemens for the affected products to address this vulnerability and protect the systems.