CVE-2023-25764 : Exploit Details and Defense Strategies

This is a published CVE with the ID CVE-2023-25764 that affects the Jenkins Email Extension Plugin.

Understanding CVE-2023-25764

This CVE involves a vulnerability in the Jenkins Email Extension Plugin version 2.93 and earlier, where there is a lack of escaping, sanitization, or sandboxing of rendered email template output or log output during template rendering. This results in a stored cross-site scripting (XSS) vulnerability that can be exploited by attackers who have the ability to create or modify custom email templates.

What is CVE-2023-25764?

CVE-2023-25764 is a security vulnerability found in the Jenkins Email Extension Plugin that allows attackers to execute cross-site scripting attacks by exploiting the lack of proper sanitization of email template output.

The Impact of CVE-2023-25764

The impact of this vulnerability is significant as it can be exploited by malicious actors to inject and execute malicious scripts within the context of the affected application, potentially compromising the integrity and confidentiality of sensitive information.

Technical Details of CVE-2023-25764

This section provides more technical insights into the vulnerability, affected systems, and the exploitation mechanism.

Vulnerability Description

The vulnerability in the Jenkins Email Extension Plugin version 2.93 and earlier arises from the failure to properly escape, sanitize, or sandbox the rendered email template output or log output, leading to a stored cross-site scripting vulnerability.

Affected Systems and Versions

The Jenkins Email Extension Plugin versions 2.93 and earlier are affected by CVE-2023-25764. Users using these versions are at risk of exploitation if proper mitigation measures are not implemented.

Exploitation Mechanism

Attackers with the ability to create or modify custom email templates can exploit this vulnerability by injecting malicious scripts, which can then be executed within the context of the affected application, leading to potential XSS attacks.

Mitigation and Prevention

To address CVE-2023-25764 and enhance the security of Jenkins installations, users and administrators are advised to take immediate steps and implement long-term security practices.

Immediate Steps to Take

Update the Jenkins Email Extension Plugin to a version that includes a patch for the vulnerability.
Avoid using custom email templates until the plugin has been updated to prevent exploitation.
Monitor for any suspicious activity related to email template rendering.

Long-Term Security Practices

Regularly update all Jenkins plugins to the latest versions to patch known vulnerabilities.
Educate users and administrators on best practices for secure plugin usage and configuration.
Implement security mechanisms to prevent and detect XSS attacks within Jenkins.

Patching and Updates

Stay informed about security advisories from Jenkins and promptly apply patches and updates to address known vulnerabilities like CVE-2023-25764. Regularly check for new releases and security announcements to keep the Jenkins environment secure.