CVE-2021-42073 : Security Advisory and Response
Discover the impact of CVE-2021-42073 in Barrier software, allowing unauthorized access to active server states and potential manipulation of input devices. Learn about mitigation steps.
An issue was discovered in Barrier before 2.4.0. An attacker can enter an active session state with the barriers component simply by supplying a client label that identifies a valid client configuration. In the active session state, an attacker can capture input device events from the server and modify the clipboard content.
Understanding CVE-2021-42073
This CVE describes a vulnerability in the Barrier software that allows an attacker to manipulate a server's input device events.
What is CVE-2021-42073?
The CVE-2021-42073 vulnerability allows unauthorized access to an active session state on the server, enabling the capture of input device events and the modification of clipboard content.
The Impact of CVE-2021-42073
- Unauthorized access to server input device events
- Potential modification of server clipboard content
Technical Details of CVE-2021-42073
This section provides an overview of the technical aspects of the CVE.
Vulnerability Description
- Attacker can enter an active session state using a valid client configuration
- Input device events can be captured from the server
- Clipboard content on the server can be modified
Affected Systems and Versions
- Vendor: n/a
- Product: n/a
- Affected Version: n/a
Exploitation Mechanism
- Attacker provides a client label to identify a valid client configuration
- Guessing the client label from hostnames or publicly available information
Mitigation and Prevention
It is crucial to take immediate steps and implement long-term security practices to mitigate the risks posed by CVE-2021-42073.
Immediate Steps to Take
- Update Barrier software to version 2.4.0 or later
- Implement network segmentation to limit access
- Monitor and log server input device events
Long-Term Security Practices
- Conduct regular security assessments and audits
- Educate users about safe practices for server access
- Employ strong authentication mechanisms
Patching and Updates
- Patch the Barrier software to version 2.4.0 or above
- Regularly check for updates and apply patches promptly