CVE-2021-27793 : Security Advisory and Response
Learn about CVE-2021-27793 involving intermittent authorization failure in Brocade Fabric OS versions before v9.0.1b, impacting user login capabilities on the network switch.
Intermittent authorization failure in AAA TACACS+ with Brocade Fabric OS versions before v9.0.1b and after v9.0.0, along with versions before v8.2.3a and after v8.2.0, could lead to a user with a valid account being unable to log into the switch.
Understanding CVE-2021-27793
This CVE involves an improper authorization issue in Brocade Fabric OS, impacting user login capabilities due to intermittent authorization failures.
What is CVE-2021-27793?
The CVE refers to the intermittent authorization failure in AAA TACACS+ with specific versions of Brocade Fabric OS, inhibiting users with valid accounts from logging into the switch.
The Impact of CVE-2021-27793
The vulnerability could lead to authorized users being locked out of their accounts, potentially disrupting network access operations and causing inconvenience.
Technical Details of CVE-2021-27793
The following technical details describe the vulnerability in Brocade Fabric OS.
Vulnerability Description
The vulnerability involves intermittent authorization failures in AAA TACACS+, affecting user login functionality in Brocade Fabric OS.
Affected Systems and Versions
Brocade Fabric OS versions before v9.0.1b and after v9.0.0, as well as versions before v8.2.3a and after v8.2.0, are susceptible to this authorization issue.
Exploitation Mechanism
The vulnerability allows an attacker to exploit the intermittent authorization failures to prevent authorized users from logging into the switch.
Mitigation and Prevention
To address CVE-2021-27793, users and organizations can take proactive measures to mitigate the risks associated with this vulnerability.
Immediate Steps to Take
Immediately update the affected Brocade Fabric OS versions to the patched releases provided by the vendor to prevent authorization failures.
Long-Term Security Practices
Implement robust access control policies, monitor login activities, and regularly review and update authentication mechanisms to enhance network security.
Patching and Updates
Regularly apply security patches and updates released by Brocade for Fabric OS to ensure continued protection against known vulnerabilities.