CVE-2021-27657 : Vulnerability Insights and Analysis
Learn about CVE-2021-27657, a High-severity vulnerability in Johnson Controls' Metasys. Understand the impact, affected versions, exploitation, and mitigation steps.
This CVE-2021-27657 article provides detailed information about the Metasys Improper Privilege Management vulnerability affecting Johnson Controls' Metasys version 11.0 and prior. Learn about the vulnerability, its impact, technical details, and mitigation steps.
Understanding CVE-2021-27657
CVE-2021-27657 refers to the Metasys Improper Privilege Management vulnerability discovered on June 4, 2021.
What is CVE-2021-27657?
The vulnerability allows an authenticated Metasys user to gain unauthorized access to the server file system, enabling them to view or modify system files by sending specially crafted web messages.
The Impact of CVE-2021-27657
With a CVSS base score of 8.8 (High severity), this vulnerability has a significant impact on confidentiality, integrity, and availability. It poses a serious threat to affected systems.
Technical Details of CVE-2021-27657
This section delves into the specifics of the vulnerability.
Vulnerability Description
The flaw allows authenticated users to access the server file system and manipulate system files through malicious web messages.
Affected Systems and Versions
Johnson Controls' Metasys version 11.0 and earlier versions are vulnerable to exploitation.
Exploitation Mechanism
Attackers exploit the vulnerability by sending crafted web messages to the Metasys system, granting them unauthorized access to the server file system.
Mitigation and Prevention
Discover the steps to address and prevent the CVE-2021-27657 vulnerability.
Immediate Steps to Take
For Metasys versions older than 9.0, upgrading to a supported release is recommended. For versions 9.0, 10.0, 10.1, and 11.0, installing the necessary patch is crucial.
Long-Term Security Practices
Implement strong access controls, regular security updates, and monitoring to enhance overall system security.
Patching and Updates
Stay informed about security advisories and ensure timely application of relevant patches to protect systems against known vulnerabilities.