CVE-2024-20931 Overview
CVE-2024-20931 is a vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware, specifically affecting the Core component. This easily exploitable vulnerability allows an unauthenticated attacker with network access via T3 or IIOP protocols to compromise Oracle WebLogic Server. Successful exploitation can result in unauthorized access to critical data or complete access to all Oracle WebLogic Server accessible data.
Critical Impact
Unauthenticated attackers can gain complete access to all Oracle WebLogic Server accessible data through network-based attacks via T3 or IIOP protocols without user interaction.
Affected Products
- Oracle WebLogic Server 12.2.1.4.0
- Oracle WebLogic Server 14.1.1.0.0
Discovery Timeline
- 2024-02-17 - CVE CVE-2024-20931 published to NVD
- 2025-03-28 - Last updated in NVD database
Technical Details for CVE-2024-20931
Vulnerability Analysis
This vulnerability affects the Core component of Oracle WebLogic Server and is classified under CWE-284 (Improper Access Control). The flaw allows unauthenticated remote attackers to bypass access controls and gain unauthorized access to sensitive data stored within the WebLogic Server environment. The attack can be executed remotely over the network without requiring any privileges or user interaction, making it highly dangerous for internet-facing WebLogic deployments.
The vulnerability specifically impacts the T3 and IIOP protocols, which are fundamental communication protocols used by WebLogic Server for client-server communication and distributed object management. Attackers exploiting this vulnerability can potentially access all data accessible to the WebLogic Server, representing a significant confidentiality breach.
Root Cause
The root cause of CVE-2024-20931 lies in improper access control within the Core component of Oracle WebLogic Server. The vulnerability stems from insufficient validation and authorization checks when processing requests through the T3 and IIOP protocols. This allows unauthenticated network requests to bypass security controls and access protected data resources.
Attack Vector
The attack vector for this vulnerability is network-based, requiring an attacker to have network access to the target WebLogic Server. The exploitation occurs through the T3 (WebLogic proprietary protocol) or IIOP (Internet Inter-ORB Protocol) interfaces. An attacker can craft malicious requests to these protocols that circumvent authentication mechanisms, enabling unauthorized data retrieval.
The attack requires no authentication credentials, no user interaction, and has low complexity, making it accessible to attackers with basic networking knowledge and access to vulnerable WebLogic Server instances.
Detection Methods for CVE-2024-20931
Indicators of Compromise
- Unusual network traffic patterns on T3 protocol ports (typically port 7001 or 7002)
- Unexpected IIOP protocol connections from external or unauthorized IP addresses
- Anomalous data access patterns or large data transfers from WebLogic Server
- Authentication bypass attempts logged in WebLogic Server security logs
Detection Strategies
- Monitor network traffic for suspicious T3 and IIOP protocol activity, particularly from untrusted sources
- Implement intrusion detection rules to identify exploitation attempts targeting WebLogic Server protocols
- Review WebLogic Server audit logs for unauthorized data access attempts or authentication anomalies
- Deploy network segmentation monitoring to detect lateral movement attempts following potential exploitation
Monitoring Recommendations
- Enable verbose logging for T3 and IIOP protocol handlers in WebLogic Server
- Configure SIEM alerts for unusual WebLogic Server access patterns or data exfiltration indicators
- Implement network flow analysis to baseline and monitor T3/IIOP traffic volumes and sources
- Regularly audit WebLogic Server access logs for signs of unauthorized data retrieval
How to Mitigate CVE-2024-20931
Immediate Actions Required
- Apply the Oracle Critical Patch Update from January 2024 immediately to all affected WebLogic Server instances
- Restrict network access to T3 and IIOP protocols from untrusted networks using firewall rules
- If immediate patching is not possible, disable T3 and IIOP protocol access from external networks
- Conduct a security assessment to identify all WebLogic Server instances running affected versions (12.2.1.4.0 and 14.1.1.0.0)
Patch Information
Oracle has addressed this vulnerability in the Oracle Critical Patch Update from January 2024. Organizations should apply the appropriate patches for their WebLogic Server versions (12.2.1.4.0 or 14.1.1.0.0) as soon as possible. The patch should be tested in a non-production environment before deployment to ensure compatibility with existing applications.
Workarounds
- Implement network-level access controls to restrict T3 and IIOP protocol access to trusted internal networks only
- Configure WebLogic Server connection filters to explicitly deny external access to T3 and IIOP protocols
- Deploy a Web Application Firewall (WAF) or network security appliance to filter and monitor WebLogic protocol traffic
- Consider placing WebLogic Server instances behind a reverse proxy that does not expose T3/IIOP protocols
# Example WebLogic connection filter configuration
# Add to config.xml to restrict T3 protocol access
# Deny all external access, allow only internal networks
# weblogic.security.net.ConnectionFilterImpl
# 192.168.0.0/16 * * allow
# 10.0.0.0/8 * * allow
# 0.0.0.0/0 * * deny
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
