CVE-2019-1003011 Explained : Impact and Mitigation

A vulnerability has been identified in versions earlier than 2.5 of the Jenkins Token Macro Plugin, allowing attackers to manipulate token macro input and potentially execute recursive input.

Understanding CVE-2019-1003011

This CVE involves an information exposure and denial of service vulnerability in the Jenkins Token Macro Plugin.

What is CVE-2019-1003011?

The vulnerability affects versions prior to 2.5 of the Jenkins Token Macro Plugin.
Attackers can exploit this issue by manipulating token macro input, leading to unexpected macro evaluation.

The Impact of CVE-2019-1003011

Attackers with the ability to control token macro input, such as SCM changelogs, can define recursive input, resulting in unexpected macro evaluation.

Technical Details of CVE-2019-1003011

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability exists in specific files within the Jenkins Token Macro Plugin, including Parser.java, TokenMacro.java, AbstractChangesSinceMacro.java, ChangesSinceLastBuildMacro.java, and ProjectUrlMacro.java.

Affected Systems and Versions

Jenkins Token Macro Plugin versions 2.5 and earlier are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit the vulnerability by manipulating token macro input, such as SCM changelogs, to define recursive input.

Mitigation and Prevention

Here are the steps to mitigate and prevent exploitation of CVE-2019-1003011.

Immediate Steps to Take

Upgrade the Jenkins Token Macro Plugin to version 2.5 or later.
Monitor and restrict access to token macro input to prevent unauthorized manipulation.

Long-Term Security Practices

Regularly update and patch all software components to address known vulnerabilities.
Implement secure coding practices to prevent input manipulation attacks.

Patching and Updates

Stay informed about security advisories and promptly apply patches released by Jenkins project.