CVE-2020-11971: Apache Camel JMX Rebind Vulnerability

CVE-2020-11971 Overview

CVE-2020-11971 is a JMX rebind vulnerability affecting Apache Camel, an open-source integration framework based on Enterprise Integration Patterns. The vulnerability exists in the JMX (Java Management Extensions) component, which allows remote attackers to exploit a rebind flaw that could lead to unauthorized information disclosure. Apache Camel versions 2.22.x, 2.23.x, 2.24.x, 2.25.x, and 3.0.0 through 3.1.0 are affected by this vulnerability.

Critical Impact

Remote attackers can exploit the JMX rebind flaw to gain unauthorized access to sensitive information without requiring authentication or user interaction.

Affected Products

• Apache Camel 2.22.x, 2.23.x, 2.24.x, 2.25.x, 3.0.0 - 3.1.0
• Oracle Communications Diameter Intelligence Hub
• Oracle Communications Diameter Signaling Router
• Oracle Enterprise Manager Base Platform 13.3.0.0 and 13.4.0.0
• Oracle FLEXCUBE Private Banking 12.0.0 and 12.1.0

Discovery Timeline

• May 14, 2020 - CVE-2020-11971 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2020-11971

Vulnerability Analysis

The JMX rebind vulnerability in Apache Camel represents a significant security weakness in how the framework handles JMX connections. JMX is a Java technology that provides tools for managing and monitoring applications, system objects, devices, and service-oriented networks. When improperly secured, JMX endpoints can become attack vectors for unauthorized access.

In this case, the vulnerability allows attackers to rebind JMX connectors, effectively hijacking legitimate JMX connections. This network-accessible vulnerability requires no authentication or user interaction to exploit, making it particularly dangerous for internet-facing Apache Camel deployments. The primary impact is confidentiality loss, as attackers can extract sensitive configuration data, credentials, and other managed bean information through the compromised JMX interface.

Root Cause

The root cause of CVE-2020-11971 lies in insufficient validation and security controls within Apache Camel's JMX component. The framework fails to properly restrict rebind operations on JMX connectors, allowing remote attackers to rebind the JMX registry to an attacker-controlled server. This enables man-in-the-middle scenarios where sensitive management traffic can be intercepted and information disclosed without proper authorization checks.

Attack Vector

The attack is conducted remotely over the network. An attacker can exploit this vulnerability by targeting exposed JMX ports (typically 1099 or custom configured ports) on systems running vulnerable Apache Camel versions. The exploitation process involves rebinding the RMI registry used by JMX to redirect management connections through an attacker-controlled endpoint.

The attack sequence typically involves identifying exposed JMX services, initiating a rebind request to the vulnerable Camel JMX component, and redirecting subsequent management traffic to capture sensitive information such as application configurations, credentials stored in MBeans, and runtime operational data.

Detection Methods for CVE-2020-11971

Indicators of Compromise

• Unexpected RMI/JMX connections from external IP addresses to internal JMX ports
• Anomalous rebind requests in JMX registry logs
• Unusual outbound connections from Camel application servers to unknown external hosts
• Evidence of JMX management data exfiltration in network traffic analysis

Detection Strategies

• Monitor JMX ports (default 1099) for connections from unauthorized IP addresses
• Implement network-level detection for RMI protocol anomalies and unexpected rebind operations
• Deploy application-level logging to capture JMX registry modifications and connector changes
• Use intrusion detection systems with signatures for JMX exploitation attempts

Monitoring Recommendations

• Enable verbose JMX logging and forward logs to a centralized SIEM for correlation analysis
• Implement network segmentation monitoring to detect lateral movement attempts via JMX
• Configure alerts for any JMX activity outside of authorized management windows and source IPs
• Regularly audit JMX configurations across all Apache Camel deployments

How to Mitigate CVE-2020-11971

Immediate Actions Required

• Upgrade Apache Camel to version 3.2.0 or later immediately
• Restrict JMX port access using firewalls to allow only authorized management networks
• Disable JMX functionality if not required for application monitoring
• Review and audit all systems using Oracle products that bundle Apache Camel

Patch Information

Apache has addressed this vulnerability in Apache Camel version 3.2.0 and later releases. Users running affected versions should upgrade immediately. For detailed patch information, refer to the Apache Camel Security Advisory.

Oracle has also released patches through their Critical Patch Updates addressing this vulnerability in affected Oracle products. Consult the Oracle Critical Patch Update April 2022 for Oracle-specific remediation guidance.

Workarounds

• Bind JMX services to localhost only (-Djava.rmi.server.hostname=127.0.0.1) if remote management is not required
• Implement JMX authentication by configuring jmxremote.password and jmxremote.access files
• Use SSL/TLS for JMX connections to encrypt management traffic and prevent interception
• Deploy network-level controls such as VPNs or jump hosts for any required remote JMX access

# Configuration example - Restrict JMX to localhost and enable authentication
JAVA_OPTS="$JAVA_OPTS -Dcom.sun.management.jmxremote"
JAVA_OPTS="$JAVA_OPTS -Dcom.sun.management.jmxremote.port=1099"
JAVA_OPTS="$JAVA_OPTS -Djava.rmi.server.hostname=127.0.0.1"
JAVA_OPTS="$JAVA_OPTS -Dcom.sun.management.jmxremote.authenticate=true"
JAVA_OPTS="$JAVA_OPTS -Dcom.sun.management.jmxremote.ssl=true"
JAVA_OPTS="$JAVA_OPTS -Dcom.sun.management.jmxremote.password.file=/path/to/jmxremote.password"
JAVA_OPTS="$JAVA_OPTS -Dcom.sun.management.jmxremote.access.file=/path/to/jmxremote.access"