CVE-2023-27898 : Security Advisory and Response

This article provides detailed information on CVE-2023-27898, its impact, technical details, and mitigation strategies.

Understanding CVE-2023-27898

CVE-2023-27898 is a security vulnerability identified in Jenkins, affecting versions 2.270 through 2.393 and LTS 2.277.1 through 2.375.3. The vulnerability allows for a stored cross-site scripting (XSS) attack by manipulating error messages related to plugin incompatibility.

What is CVE-2023-27898?

The vulnerability in Jenkins versions 2.270 through 2.393 and LTS 2.277.1 through 2.375.3 enables attackers to exploit a stored cross-site scripting (XSS) vulnerability by providing malicious plugins to configured update sites. By altering the error message that displays plugin incompatibility, attackers can execute XSS attacks.

The Impact of CVE-2023-27898

The impact of CVE-2023-27898 is significant as it allows attackers to inject and execute malicious scripts within the Jenkins environment. This can lead to unauthorized access, data theft, and potential system compromise if exploited successfully.

Technical Details of CVE-2023-27898

The vulnerability stems from Jenkins failing to properly escape the version information of plugins in error messages, making it susceptible to XSS attacks.

Vulnerability Description

Jenkins versions 2.270 through 2.393 and LTS 2.277.1 through 2.375.3 do not correctly escape the plugin version details in error messages, creating a pathway for malicious actors to inject and execute XSS payloads.

Affected Systems and Versions

The affected versions include Jenkins 2.270 through 2.393 and LTS 2.277.1 through 2.375.3. Users utilizing these versions are at risk of exploitation if the vulnerability is not addressed promptly.

Exploitation Mechanism

Attackers can take advantage of the vulnerability by providing specially crafted plugins to the update sites configured in Jenkins. By triggering the error message related to plugin incompatibility, malicious scripts can be executed within the Jenkins environment.

Mitigation and Prevention

To mitigate the risks associated with CVE-2023-27898, users and administrators should take immediate steps, implement long-term security practices, and apply necessary patches and updates.

Immediate Steps to Take

Update Jenkins to the latest patched version to address the vulnerability.
Restrict plugin installation to trusted sources only.
Monitor Jenkins logs for any suspicious activities or error messages.

Long-Term Security Practices

Regularly audit and update plugins in Jenkins to ensure compatibility and security.
Educate users on best practices for plugin management and security hygiene.
Conduct periodic security assessments and penetration testing on Jenkins instances.

Patching and Updates

Users are advised to refer to the Jenkins Security Advisory 2023-03-08 for detailed information on the vulnerability and instructions on applying patches and updates to secure their Jenkins deployments.