CVE-2020-2158 : Security Advisory and Response

Jenkins Literate Plugin 1.0 and earlier versions are vulnerable to remote code execution due to a YAML parser misconfiguration.

Understanding CVE-2020-2158

Jenkins Literate Plugin is susceptible to a critical security flaw that allows attackers to execute arbitrary code remotely.

What is CVE-2020-2158?

This CVE refers to a vulnerability in Jenkins Literate Plugin versions 1.0 and below, where the YAML parser lacks proper configuration, enabling the execution of arbitrary types, leading to remote code execution.

The Impact of CVE-2020-2158

The vulnerability poses a severe risk as attackers can exploit it to execute malicious code remotely, potentially compromising the entire system where the plugin is installed.

Technical Details of CVE-2020-2158

Jenkins Literate Plugin's vulnerability is detailed below:

Vulnerability Description

The issue arises from the plugin's failure to secure its YAML parser, allowing the instantiation of arbitrary types, creating a pathway for remote code execution.

Affected Systems and Versions

Product: Jenkins Literate Plugin
Vendor: Jenkins project
Versions Affected:
Jenkins Literate Plugin <= 1.0 (status: affected)
Jenkins Literate Plugin next of 1.0 (status: unknown)

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting malicious YAML payloads that, when processed by the plugin, trigger the execution of unauthorized code.

Mitigation and Prevention

To address CVE-2020-2158, follow these steps:

Immediate Steps to Take

Update Jenkins Literate Plugin to a patched version.
Monitor for any unusual behavior on the system.
Implement network segmentation to limit the plugin's reach.

Long-Term Security Practices

Regularly update all software components to prevent vulnerabilities.
Conduct security audits and penetration testing on Jenkins instances.

Patching and Updates

Apply the latest security patches provided by Jenkins project to mitigate the vulnerability.