CVE-2021-21677 : Vulnerability Insights and Analysis

Jenkins Code Coverage API Plugin version 1.4.0 and earlier, developed by Jenkins project, is susceptible to a remote code execution vulnerability due to the lack of Jenkins JEP-200 deserialization protection for Java objects obtained from disk.

Understanding CVE-2021-21677

This section provides insights into the nature of the CVE-2021-21677 vulnerability.

What is CVE-2021-21677?

CVE-2021-21677 is a vulnerability in the Jenkins Code Coverage API Plugin versions 1.4.0 and earlier. It arises from the plugin's failure to implement Jenkins JEP-200 deserialization protection for Java objects, thereby opening up the potential for remote code execution.

The Impact of CVE-2021-21677

The impact of this vulnerability is the exposure to remote code execution attacks, which could lead to unauthorized access, data breaches, and system compromise.

Technical Details of CVE-2021-21677

In this section, the technical details of CVE-2021-21677 are discussed.

Vulnerability Description

The vulnerability lies in the lack of proper deserialization protection for Java objects read from disk, allowing attackers to exploit this flaw for remote code execution.

Affected Systems and Versions

Jenkins Code Coverage API Plugin versions 1.4.0 and earlier are impacted by this vulnerability, with customized versions falling under the affected category.

Exploitation Mechanism

The vulnerability can be exploited by malicious actors who could craft and send specially designed requests to trigger the execution of arbitrary code on the target system.

Mitigation and Prevention

This section guides users on how to mitigate and prevent the CVE-2021-21677 vulnerability.

Immediate Steps to Take

Users are advised to update the Jenkins Code Coverage API Plugin to a non-vulnerable version and apply relevant patches to fix the issue.

Long-Term Security Practices

Regularly update plugins and software to stay protected from known vulnerabilities and follow security best practices to enhance overall system security.

Patching and Updates

Stay informed about security advisories from Jenkins and promptly apply patches and updates to ensure that systems are safeguarded against known vulnerabilities.