CVE-2021-21683 : Security Advisory and Response

Jenkins 2.314 and earlier, LTS 2.303.1 and earlier are vulnerable to a path traversal issue on Windows operating systems, potentially allowing attackers to access arbitrary files.

Understanding CVE-2021-21683

This CVE ID refers to a security vulnerability in Jenkins that affects specific versions, leading to a path traversal exploit on Windows systems.

What is CVE-2021-21683?

The vulnerability in Jenkins versions 2.314 and earlier, LTS 2.303.1 and earlier, allows attackers with certain permissions to view the contents of arbitrary files.

The Impact of CVE-2021-21683

Exploiting this vulnerability can result in unauthorized access to sensitive information, posing a risk to the confidentiality of data stored on affected systems.

Technical Details of CVE-2021-21683

The following technical details provide insight into the nature of the vulnerability and its implications.

Vulnerability Description

Jenkins versions 2.314 and earlier, LTS 2.303.1 and earlier, are susceptible to path traversal attacks on Windows machines, where attackers with specific permissions can retrieve arbitrary file contents.

Affected Systems and Versions

The vulnerability impacts Jenkins installations running versions 2.314 and below, LTS 2.303.1 and below, specifically on Windows environments.

Exploitation Mechanism

By exploiting the path traversal vulnerability, attackers with relevant permissions can retrieve the contents of unauthorized files on Windows systems.

Mitigation and Prevention

To safeguard your Jenkins deployment and mitigate the risks associated with CVE-2021-21683, certain preventative measures need to be taken.

Immediate Steps to Take

Update Jenkins to a patched version that addresses the vulnerability.
Restrict access permissions to prevent unauthorized users from exploiting the path traversal issue.

Long-Term Security Practices

Regularly monitor security advisories from Jenkins to stay informed about potential vulnerabilities.
Conduct security audits and assessments to identify and remediate security gaps proactively.

Patching and Updates

Apply security patches released by Jenkins promptly to ensure that your system is protected against known vulnerabilities.