CVE-2021-21864 : Exploit Details and Defense Strategies
Learn about CVE-2021-21864, an unsafe deserialization vulnerability in CODESYS Development System versions 3.5.16 and 3.5.17, allowing arbitrary command execution. Find mitigation steps and long-term security practices.
A detailed overview of the unsafe deserialization vulnerability in CODESYS GmbH CODESYS Development System versions 3.5.16 and 3.5.17, leading to arbitrary command execution.
Understanding CVE-2021-21864
This CVE details an unsafe deserialization vulnerability in CODESYS Development System versions 3.5.16 and 3.5.17, allowing attackers to execute arbitrary commands by exploiting a specially crafted file.
What is CVE-2021-21864?
CVE-2021-21864 is an unsafe deserialization vulnerability present in the ComponentModel ComponentManager.StartupCultureSettings feature of CODESYS GmbH CODESYS Development System versions 3.5.16 and 3.5.17. Attackers can leverage a malicious file to trigger this vulnerability.
The Impact of CVE-2021-21864
The vulnerability has a CVSS base score of 7.8, categorizing it as high severity. It can have a significant impact on confidentiality, integrity, and availability as attackers can execute arbitrary commands through a specially crafted file.
Technical Details of CVE-2021-21864
This section provides insights into the vulnerability's description, affected systems, and exploitation mechanism.
Vulnerability Description
The vulnerability exists in the ComponentModel ComponentManager.StartupCultureSettings functionality of CODESYS Development System versions 3.5.16 and 3.5.17. A specially crafted file can be used by attackers to achieve arbitrary command execution.
Affected Systems and Versions
CODESYS GmbH CODESYS Development System versions 3.5.16 and 3.5.17 are affected by this vulnerability.
Exploitation Mechanism
Attackers can provide a malicious file to trigger the vulnerability, allowing them to execute arbitrary commands.
Mitigation and Prevention
Discover the immediate steps to take and best practices for long-term security against CVE-2021-21864.
Immediate Steps to Take
Users are advised to apply patches promptly, restrict file uploads, and implement proper input validation to mitigate the risk of exploitation.
Long-Term Security Practices
Implement secure coding practices, conduct regular security assessments, and educate users on safe file handling to enhance long-term security.
Patching and Updates
Ensure timely installation of security patches released by CODESYS to address the CVE-2021-21864 vulnerability.