CVE-2021-21679 : Exploit Details and Defense Strategies

This article provides an overview of CVE-2021-21679, a vulnerability in the Jenkins Azure AD Plugin that allows attackers to bypass CSRF protection.

Understanding CVE-2021-21679

CVE-2021-21679 is a security vulnerability in the Jenkins Azure AD Plugin that enables attackers to craft URLs to bypass the CSRF protection of any target URL within Jenkins.

What is CVE-2021-21679?

The vulnerability in the Jenkins Azure AD Plugin, specifically versions 179.vf6841393099e and earlier, allows malicious actors to create URLs that can evade the CSRF protection mechanism in Jenkins, potentially leading to unauthorized access.

The Impact of CVE-2021-21679

The impact of CVE-2021-21679 includes the potential for attackers to exploit the CSRF protection bypass in affected Jenkins instances, posing a risk of security compromise and unauthorized actions on the Jenkins platform.

Technical Details of CVE-2021-21679

The technical details of CVE-2021-21679 involve the specific vulnerability description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The Jenkins Azure AD Plugin versions 179.vf6841393099e and earlier are vulnerable to attackers crafting URLs to bypaCve the CSRF protection in Jenkins, facilitating potential unauthorized access.

Affected Systems and Versions

The affected systems and versions include Jenkins Azure AD Plugin versions starting from 164.v5b48baa961d2 up to 179.vf6841393099e, leaving these instances susceptible to the CSRF protection bypass.

Exploitation Mechanism

The exploitation of CVE-2021-21679 involves attackers manipulating URLs within the affected Jenkins Azure AD Plugin versions to circumvent CSRF protection, enabling them to carry out unauthorized actions.

Mitigation and Prevention

To mitigate and prevent the risks associated with CVE-2021-21679, it is essential to take immediate steps, implement long-term security practices, and ensure timely patching and updates.

Immediate Steps to Take

Users of Jenkins Azure AD Plugin are advised to update to a secure version, monitor for any suspicious activities, and review access controls to prevent unauthorized entry.

Long-Term Security Practices

Implementing robust security protocols, conducting regular security audits, and educating users on safe practices can help enhance the overall security posture and resilience of Jenkins instances.

Patching and Updates

Regularly applying patches and updates released by Jenkins project for the Azure AD Plugin is crucial to address known vulnerabilities, enhance security features, and safeguard against potential exploits.