CVE-2021-21682 : Vulnerability Insights and Analysis

Jenkins 2.314 and earlier, LTS 2.303.1 and earlier, accept names of jobs and other entities with a trailing dot character, potentially replacing the configuration and data of other entities on Windows.

Understanding CVE-2021-21682

This CVE affects Jenkins, specifically versions 2.314 and prior, as well as LTS 2.303.1 and earlier. The vulnerability allows for the acceptance of names with a trailing dot character, which can lead to the replacement of configuration and data of other entities on Windows.

What is CVE-2021-21682?

CVE-2021-21682 is a security vulnerability in Jenkins that allows malicious users to manipulate job names and other entities by adding a trailing dot character, potentially compromising the configuration and data of other entities.

The Impact of CVE-2021-21682

This vulnerability can be exploited by attackers to overwrite the configuration and data of other entities within the affected Jenkins versions on Windows.

Technical Details of CVE-2021-21682

The technical details of CVE-2021-21682 include:

Vulnerability Description

The vulnerability arises from Jenkins versions 2.314 and earlier, LTS 2.303.1 and earlier, accepting names with a trailing dot character, leading to potential data replacement.

Affected Systems and Versions

Jenkins versions 2.314 and earlier, as well as LTS 2.303.1 and earlier, are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by manipulating job names and entities with a trailing dot, enabling them to overwrite the configuration and data of other entities on Windows.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-21682, consider the following steps:

Immediate Steps to Take

Update Jenkins to a patched version that addresses the vulnerability.
Implement strict job naming conventions to prevent malicious input.

Long-Term Security Practices

Regularly monitor Jenkins security advisories and update to the latest versions promptly.
Educate users and administrators on secure job naming practices.

Patching and Updates

Apply patches released by Jenkins to fix the vulnerability. Stay informed about security updates and maintain a proactive approach to security.