CVE-2022-23713: Elastic Kibana XSS Vulnerability

CVE-2022-23713 Overview

A cross-site-scripting (XSS) vulnerability was discovered in the Vega Charts Kibana integration which could allow arbitrary JavaScript to be executed in a victim's browser. This vulnerability affects Elastic Kibana, a popular data visualization and exploration tool used for log and time-series analytics. The Vega Charts integration enables users to create custom visualizations, but improper input validation in this component could allow attackers to inject malicious scripts.

Critical Impact

Successful exploitation allows attackers to execute arbitrary JavaScript in authenticated user browsers, potentially leading to session hijacking, data theft, or unauthorized actions within the Kibana interface.

Affected Products

• Elastic Kibana (versions prior to 8.3.1, 8.3.0, and 7.17.5)

Discovery Timeline

• 2022-07-06 - CVE CVE-2022-23713 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2022-23713

Vulnerability Analysis

This cross-site scripting vulnerability exists within the Vega Charts integration component of Elastic Kibana. The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation), indicating that user-supplied input is not properly sanitized before being rendered in the browser context.

The attack requires user interaction, meaning a victim must be tricked into viewing a maliciously crafted visualization or clicking a specially crafted link. Once exploited, the attacker's JavaScript code executes within the security context of the authenticated Kibana session, giving the attacker access to perform any action the victim user is authorized to perform.

The scope is changed, meaning the vulnerability can affect resources beyond its security scope, potentially impacting other components or data the user has access to within the Elastic Stack ecosystem.

Root Cause

The root cause of this vulnerability is insufficient input validation and output encoding in the Vega Charts visualization rendering pipeline. When Vega chart specifications are processed and rendered, certain user-controlled input fields are not properly sanitized, allowing malicious script content to be interpreted as executable code rather than data.

Attack Vector

The attack is network-based and requires no authentication to initiate, though it does require user interaction for successful exploitation. An attacker could craft a malicious Vega visualization specification containing embedded JavaScript code. When a victim user views this visualization through a shared dashboard, saved object, or specially crafted URL, the malicious script executes in their browser.

Potential attack scenarios include:

• Creating a shared dashboard with embedded malicious Vega chart specifications
• Sending a crafted link to a visualization that triggers the XSS payload
• Storing malicious content in saved objects that other users may access

The vulnerability allows for limited confidentiality and integrity impact, enabling attackers to steal session tokens, modify displayed data, or perform actions on behalf of the victim user.

Detection Methods for CVE-2022-23713

Indicators of Compromise

• Unexpected JavaScript execution patterns in Kibana visualization logs
• Unusual Vega chart specifications containing encoded script tags or event handlers
• Browser console errors indicating blocked or suspicious script execution
• Anomalous user session activity following visualization access

Detection Strategies

• Monitor Kibana server logs for requests containing suspicious patterns in Vega visualization parameters
• Implement Content Security Policy (CSP) headers to detect and report inline script execution attempts
• Review saved Vega visualizations and dashboards for potentially malicious content
• Enable browser-side XSS protection mechanisms and monitor for triggered alerts

Monitoring Recommendations

• Configure Kibana audit logging to track visualization creation and modification events
• Set up alerts for unusual patterns in saved object modifications
• Monitor for anomalous user behavior following dashboard or visualization access
• Implement real-time log analysis for Kibana access logs focusing on visualization endpoints

How to Mitigate CVE-2022-23713

Immediate Actions Required

• Upgrade Elastic Kibana to version 8.3.1, 8.3.0, or 7.17.5 or later immediately
• Review existing Vega chart visualizations and dashboards for suspicious content
• Limit user permissions for creating and modifying Vega visualizations to trusted users
• Enable Content Security Policy headers to provide defense-in-depth against XSS attacks

Patch Information

Elastic has released security updates addressing this vulnerability. According to the Elastic Security Update Discussion, users should upgrade to the following patched versions:

• Elastic Kibana 8.3.1 or later for the 8.x branch
• Elastic Kibana 7.17.5 or later for the 7.x branch

For additional security resources, refer to the Elastic Community Security Resources.

Workarounds

• Restrict access to Vega visualization creation and editing to trusted administrators only
• Implement strict Content Security Policy headers to mitigate XSS impact
• Disable or limit the Vega Charts integration if not required for operations
• Use network-level controls to limit access to Kibana from untrusted networks