CVE-2023-25765 : What You Need to Know

This CVE was published on February 15, 2023, by Jenkins. It details a vulnerability in the Jenkins Email Extension Plugin that could allow attackers to execute arbitrary code in the context of the Jenkins controller JVM.

Understanding CVE-2023-25765

This section will cover the details of CVE-2023-25765, its impact, technical description, affected systems, exploitation mechanism, and mitigation strategies.

What is CVE-2023-25765?

CVE-2023-25765 refers to a security vulnerability found in the Jenkins Email Extension Plugin version 2.93 and earlier. Attackers who can define email templates in folders could bypass Script Security protection and run arbitrary code on the Jenkins controller JVM.

The Impact of CVE-2023-25765

The vulnerability in the Jenkins Email Extension Plugin could lead to attackers executing malicious code within the Jenkins controller JVM, potentially compromising the integrity and security of the system.

Technical Details of CVE-2023-25765

Let's delve into the technical aspects of CVE-2023-25765 to better understand the vulnerability.

Vulnerability Description

The issue lies in the lack of Script Security protection for templates defined inside folders in the Jenkins Email Extension Plugin version 2.93 and earlier. This oversight allows attackers to bypass sandbox protections and execute arbitrary code.

Affected Systems and Versions

The Jenkins Email Extension Plugin versions up to and including 2.93 are affected by this vulnerability. Specifically, templates defined inside folders are vulnerable to exploitation.

Exploitation Mechanism

Attackers with the ability to define email templates in folders could exploit this vulnerability by crafting malicious templates that bypass Script Security protection, enabling them to execute arbitrary code on the Jenkins controller JVM.

Mitigation and Prevention

To safeguard systems from CVE-2023-25765, proactive measures need to be taken to mitigate the risk and prevent unauthorized code execution.

Immediate Steps to Take

Users should update the Jenkins Email Extension Plugin to a version that addresses this vulnerability, such as version 2.89.0.1, which is recognized as unaffected. Additionally, it's crucial to review and restrict access permissions for defining email templates to prevent unauthorized code execution.

Long-Term Security Practices

Implementing secure coding practices, regularly updating plugins, and maintaining strict access controls can help mitigate similar vulnerabilities in the future. Conducting security assessments and audits can also aid in identifying and addressing potential security loopholes.

Patching and Updates

Staying vigilant about security advisories and promptly applying patches and updates released by Jenkins or relevant vendors is essential to protect systems from known vulnerabilities like CVE-2023-25765. Regular monitoring and proactive security measures are key to ensuring a secure environment.