CVE-2020-2280

Vulnerability

Overview

A cross-site request forgery (CSRF) vulnerability in the Jenkins Warnings Plugin versions 5.0.1 and earlier allows attackers to craft requests that, when executed by an authenticated Jenkins user with appropriate permissions, trigger arbitrary code execution on the Jenkins controller. The issue stems from insufficient CSRF protections within the plugin's user interface components, permitting state-changing operations without token validation [1][2].

Exploitation

Prerequisites

To exploit this flaw, an attacker must convince a user with at least Overall/Read and Job/Configure permissions to interact with a malicious link or form. The attack can be delivered via phishing, a malicious website, or other cross-origin requests that automatically submit the crafted CSRF payload. Once the victim's browser submits the request, the plugin performs an unintended action—such as modifying configuration or invoking plugin functionality—without the user's knowledge [2][3].

Impact and

Risks

Successful exploitation enables arbitrary code execution in the security context of the Jenkins controller JVM. This could lead to full compromise of the Jenkins instance, including unauthorized access to jobs, credentials, build artifacts, and the ability to pivot to connected systems. The vulnerability is rated with a critical severity due to the potential for complete loss of confidentiality, integrity, and availability [1][3].

Mitigation

Status

Jenkins released Warnings Plugin version 5.0.2 to address this vulnerability. Users should upgrade immediately to this version or later. No known workarounds exist; the only effective mitigation is applying the plugin update. The advisory also recommends upgrading other affected plugins to compatible versions to ensure comprehensive protection [1][4].