CVE-2020-13932 Overview
CVE-2020-13932 is a Cross-Site Scripting (XSS) vulnerability affecting Apache ActiveMQ Artemis versions 2.5.0 through 2.13.0. The vulnerability allows attackers to inject malicious JavaScript payloads through specially crafted MQTT packets, using the client-id or topic name fields as injection vectors. When an administrator accesses the admin console, the malicious payload executes within their browser context, potentially enabling session hijacking, credential theft, or unauthorized administrative actions.
Critical Impact
Attackers can execute arbitrary JavaScript in administrator browsers through the Artemis admin console, potentially compromising administrative sessions and enabling further attacks against the messaging infrastructure.
Affected Products
- Apache ActiveMQ Artemis versions 2.5.0 through 2.13.0
- Admin console diagram plugin
- Queue node information section
Discovery Timeline
- 2020-07-20 - CVE-2020-13932 published to NVD
- 2024-11-21 - Last updated in NVD database
Technical Details for CVE-2020-13932
Vulnerability Analysis
This vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting (XSS). The flaw exists in the Apache ActiveMQ Artemis admin console, which fails to properly sanitize user-controlled input received through MQTT protocol messages before rendering it in the web interface.
The attack requires network access and user interaction, specifically an administrator viewing the affected admin console pages. The vulnerability allows an attacker to compromise the confidentiality and integrity of the administrator's session, though availability impact is limited.
Root Cause
The root cause of CVE-2020-13932 is insufficient input validation and output encoding in the Apache ActiveMQ Artemis admin console. When MQTT packets are received by the broker, the client-id and topic name fields are stored and later displayed in the admin console's diagram plugin and queue information sections without proper HTML encoding or sanitization. This allows malicious scripts embedded in these fields to execute when rendered in an administrator's browser.
Attack Vector
The attack exploits the MQTT protocol's client-id and topic name fields as XSS payload delivery mechanisms. An attacker sends specially crafted MQTT packets to the ActiveMQ Artemis broker containing JavaScript payloads in these fields. When an administrator accesses the admin console to view queue diagrams or node information, the unsanitized payload is rendered in the browser, executing the malicious script in the context of the authenticated administrative session.
The XSS payload specifically triggers in two locations within the admin console: the diagram plugin visualization and the queue node information section. This provides multiple exploitation opportunities depending on which administrative interface the victim accesses first.
Detection Methods for CVE-2020-13932
Indicators of Compromise
- MQTT connection attempts with unusual or script-containing client-id values
- Topic names containing HTML tags or JavaScript code patterns
- Admin console access logs showing requests with encoded script characters
- Browser console errors related to JavaScript execution from unexpected sources
Detection Strategies
- Monitor MQTT traffic for client-id and topic name fields containing HTML tags, script elements, or event handlers
- Implement web application firewall (WAF) rules to detect and block XSS payloads in MQTT message metadata
- Review admin console access logs for suspicious patterns following MQTT connections from untrusted sources
- Configure intrusion detection systems to alert on MQTT packets containing common XSS patterns
Monitoring Recommendations
- Enable detailed logging for MQTT connections including client-id values
- Implement Content Security Policy (CSP) headers on the admin console to mitigate script execution
- Set up alerts for admin console access immediately following connections from new or suspicious MQTT clients
- Monitor for unusual JavaScript errors or DOM modifications in admin console sessions
How to Mitigate CVE-2020-13932
Immediate Actions Required
- Upgrade Apache ActiveMQ Artemis to a version later than 2.13.0 that contains the security fix
- Restrict network access to the MQTT port to trusted clients only
- Limit admin console access to trusted networks and implement strong authentication
- Consider temporarily disabling the diagram plugin if immediate patching is not possible
Patch Information
Apache has addressed this vulnerability in versions after 2.13.0. Organizations should upgrade to the latest stable release of Apache ActiveMQ Artemis. The official security advisory is available from the Apache ActiveMQ Security Advisory. Additional technical discussions regarding the fix can be found in the Apache ActiveMQ Commit Discussion.
Workarounds
- Implement network segmentation to prevent untrusted MQTT clients from connecting to the broker
- Use a reverse proxy with XSS filtering capabilities in front of the admin console
- Disable the admin console diagram plugin through configuration if not required for operations
- Apply browser-level XSS protections and ensure administrators use modern browsers with built-in XSS filtering
# Configuration example - Restrict admin console access in broker.xml
# Add the following to limit admin console binding to localhost only
<web bind="http://localhost:8161" path="web">
<app url="console" war="console.war"/>
</web>
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
