Learn about CVE-2021-21671 affecting Jenkins versions 2.299 and earlier, and LTS 2.289.1 and earlier. Explore the impact, technical details, and mitigation strategies.
Jenkins 2.299 and earlier, LTS 2.289.1 and earlier versions do not invalidate the previous session on login.
Understanding CVE-2021-21671
This CVE affects Jenkins, specifically versions 2.266 and LTS 2.277.1, including earlier versions.
What is CVE-2021-21671?
CVE-2021-21671 is a vulnerability in Jenkins that allows attackers to maintain the user's session after the user logs out, leading to potential security risks.
The Impact of CVE-2021-21671
The vulnerability in Jenkins can be exploited by malicious actors to carry out unauthorized actions with the user's session, compromising the security and integrity of the system.
Technical Details of CVE-2021-21671
The technical details of the CVE include:
Vulnerability Description
Jenkins versions 2.299 and earlier, LTS 2.289.1 and earlier, fail to invalidate the user session upon logout, allowing attackers to exploit active user sessions.
Affected Systems and Versions
Jenkins versions affected by CVE-2021-21671 include 2.266, LTS 2.277.1, and earlier versions.
Exploitation Mechanism
Attackers can exploit this vulnerability by maintaining an active user session post-logout, enabling unauthorized access and actions within the system.
Mitigation and Prevention
To safeguard systems from CVE-2021-21671, consider the following measures:
Immediate Steps to Take
Long-Term Security Practices
Patching and Updates