CVE-2020-2193 in ECharts API Plugin
Summary
by MITRE
Jenkins ECharts API Plugin 4.7.0-3 and earlier does not escape the parser identifier when rendering charts, resulting in a stored cross-site scripting vulnerability.
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Analysis
by VulDB Data Team • 06/04/2020
The vulnerability identified as CVE-2020-2193 affects the Jenkins ECharts API Plugin version 4.7.0-3 and earlier, presenting a critical stored cross-site scripting vulnerability that arises from inadequate input sanitization during chart rendering processes. This flaw specifically manifests when the plugin fails to properly escape the parser identifier parameter before incorporating it into HTML output, creating an avenue for malicious actors to inject persistent script code into web applications that utilize this plugin. The issue stems from the plugin's insufficient validation and sanitization mechanisms that should normally protect against malicious input injection during the chart generation workflow.
The technical exploitation of this vulnerability occurs when an attacker crafts malicious input containing script code within the parser identifier field, which gets stored within the application's data store and subsequently rendered in charts without proper HTML escaping. This stored payload executes in the context of other users who view the affected charts, making it particularly dangerous as it can affect multiple users over time. The vulnerability directly maps to CWE-79, which describes Cross-Site Scripting (XSS) conditions where untrusted data is improperly incorporated into web pages without proper sanitization or escaping mechanisms. The stored nature of this XSS vulnerability means that the malicious payload persists in the application's database and executes automatically whenever affected charts are rendered, unlike reflected XSS which requires user interaction with crafted links.
From an operational perspective, this vulnerability poses significant risks to Jenkins environments that rely on ECharts for data visualization, particularly in enterprise settings where multiple users access shared dashboards and reports. Attackers could leverage this vulnerability to steal session cookies, perform unauthorized actions on behalf of other users, or redirect victims to malicious websites. The impact extends beyond simple data theft as attackers could potentially escalate privileges within the Jenkins environment or use the compromised systems as a foothold for further network penetration. The ATT&CK framework categorizes this vulnerability under T1059.001 for Command and Scripting Interpreter and T1566.001 for Phishing, as attackers could use the stored XSS to deliver malware or conduct social engineering campaigns. Organizations using Jenkins for continuous integration and deployment pipelines face heightened risk, as compromised dashboard systems could provide attackers with insights into development processes and potentially expose sensitive build information.
Mitigation strategies for CVE-2020-2193 should prioritize immediate plugin updates to versions 4.7.0-4 or later, which contain the necessary patches to properly escape parser identifiers during chart rendering. Security administrators should also implement additional protective measures including input validation at multiple layers, web application firewalls configured to detect and block suspicious script payloads, and regular security scanning of Jenkins installations for similar vulnerabilities. Organizations should conduct thorough vulnerability assessments of their Jenkins environments to identify other potentially affected plugins or components, and establish monitoring procedures to detect unauthorized modifications to dashboard configurations. The remediation process should include comprehensive testing of updated plugins to ensure compatibility with existing workflows while maintaining security posture, and regular security training for administrators to recognize and respond to potential XSS attack vectors in their CI/CD environments.