CVE-2018-1999007 : Vulnerability Insights and Analysis

Jenkins versions 2.132 and earlier, as well as 2.121.1 and earlier, contain a vulnerability in the Stapler web framework that allows attackers to inject JavaScript code into certain URLs, leading to potential cross-site scripting attacks.

Understanding CVE-2018-1999007

This CVE identifies a specific vulnerability in Jenkins that could be exploited by attackers to execute malicious JavaScript code in users' browsers.

What is CVE-2018-1999007?

This vulnerability in Jenkins allows attackers to manipulate URLs and inject JavaScript code, which gets executed when users encounter HTTP 404 error pages with Stapler debug mode enabled.

The Impact of CVE-2018-1999007

The exploitation of this vulnerability could lead to cross-site scripting attacks, enabling attackers to execute arbitrary code in the context of the affected user's browser.

Technical Details of CVE-2018-1999007

Jenkins 2.132 and earlier, as well as 2.121.1 and earlier, are affected by this vulnerability.

Vulnerability Description

The vulnerability exists in the Stapler web framework's org/kohsuke/stapler/Stapler.java, allowing attackers to inject JavaScript code into specific URLs.

Affected Systems and Versions

Jenkins versions 2.132 and earlier
Jenkins versions 2.121.1 and earlier

Exploitation Mechanism

Attackers can exploit this vulnerability by manipulating URLs in Jenkins and injecting JavaScript code, which is executed when users encounter HTTP 404 error pages with Stapler debug mode enabled.

Mitigation and Prevention

It is crucial to take immediate steps to mitigate the risks posed by CVE-2018-1999007.

Immediate Steps to Take

Disable Stapler debug mode in Jenkins to prevent the execution of injected JavaScript code.
Regularly monitor Jenkins for any suspicious activities or unauthorized access.

Long-Term Security Practices

Implement secure coding practices to prevent cross-site scripting vulnerabilities.
Educate users on recognizing and avoiding potential phishing attacks.

Patching and Updates

Update Jenkins to the latest version to patch the vulnerability and enhance security measures.