CVE-2020-2189 : Exploit Details and Defense Strategies

Jenkins SCM Filter Jervis Plugin 0.2.1 and earlier versions are affected by a remote code execution vulnerability due to improper configuration of the YAML parser.

Understanding CVE-2020-2189

This CVE involves a security issue in the Jenkins SCM Filter Jervis Plugin that allows for remote code execution.

What is CVE-2020-2189?

Jenkins SCM Filter Jervis Plugin versions 0.2.1 and earlier lack proper configuration of the YAML parser, enabling the instantiation of arbitrary types, leading to a critical remote code execution vulnerability.

The Impact of CVE-2020-2189

The vulnerability in the plugin could be exploited by attackers to execute arbitrary code remotely on affected systems, potentially leading to unauthorized access, data breaches, and system compromise.

Technical Details of CVE-2020-2189

The technical aspects of this CVE are as follows:

Vulnerability Description

The Jenkins SCM Filter Jervis Plugin 0.2.1 and earlier versions do not adequately secure the YAML parser, allowing for the instantiation of arbitrary types, which can be exploited for remote code execution.

Affected Systems and Versions

Product: Jenkins SCM Filter Jervis Plugin
Vendor: Jenkins project
Versions Affected: <= 0.2.1 (unspecified version type)

Exploitation Mechanism

The vulnerability can be exploited by crafting malicious YAML content that, when processed by the plugin, triggers the execution of unauthorized code on the target system.

Mitigation and Prevention

To address CVE-2020-2189 and enhance system security, consider the following mitigation strategies:

Immediate Steps to Take

Update the Jenkins SCM Filter Jervis Plugin to a patched version that addresses the vulnerability.
Monitor for any suspicious activities or unauthorized access attempts on the Jenkins server.

Long-Term Security Practices

Regularly review and update all installed plugins and software components to prevent security gaps.
Implement network segmentation and access controls to limit the impact of potential security breaches.

Patching and Updates

Stay informed about security advisories and updates from Jenkins project to promptly apply patches and fixes to vulnerable plugins and software components.