CVE-2024-21183 Overview
CVE-2024-21183 is a vulnerability in Oracle WebLogic Server, a component of Oracle Fusion Middleware. This vulnerability exists within the Core component and allows an unauthenticated attacker with network access via T3 or IIOP protocols to compromise the server. Successful exploitation can result in unauthorized access to critical data or complete access to all Oracle WebLogic Server accessible data.
The vulnerability is classified as easily exploitable and does not require any user interaction or authentication, making it particularly dangerous for internet-facing WebLogic deployments. Organizations running affected versions should prioritize patching to prevent potential data breaches.
Critical Impact
Unauthenticated attackers can gain unauthorized access to critical or complete data within Oracle WebLogic Server through network-based attacks via T3 or IIOP protocols.
Affected Products
- Oracle WebLogic Server 12.2.1.4.0
- Oracle WebLogic Server 14.1.1.0.0
Discovery Timeline
- July 16, 2024 - CVE-2024-21183 published to NVD
- March 26, 2025 - Last updated in NVD database
Technical Details for CVE-2024-21183
Vulnerability Analysis
This vulnerability affects the Core component of Oracle WebLogic Server and is associated with CWE-306 (Missing Authentication for Critical Function). The flaw allows attackers to bypass authentication mechanisms when accessing the server through the T3 or IIOP protocols.
The T3 protocol is Oracle's proprietary protocol used for communication between WebLogic Server instances and Java clients, while IIOP (Internet Inter-ORB Protocol) is used for CORBA-based communications. Both protocols are commonly enabled in WebLogic deployments and serve as the attack surface for this vulnerability.
The vulnerability's impact is primarily focused on confidentiality, allowing attackers to exfiltrate sensitive data without any integrity or availability impact. This suggests the vulnerability enables read access to protected resources without proper authentication validation.
Root Cause
The vulnerability stems from missing authentication controls for critical functions (CWE-306) within the WebLogic Server's Core component. When handling requests via the T3 or IIOP protocols, the server fails to properly validate that the requesting party has been authenticated before granting access to sensitive data resources.
This missing authentication check allows unauthenticated network attackers to access data that should only be available to authenticated and authorized users or applications.
Attack Vector
The attack is network-based and can be executed remotely without any user interaction. An attacker with network connectivity to a vulnerable WebLogic Server can exploit this vulnerability by:
- Establishing a connection to the target WebLogic Server via the T3 protocol (typically port 7001) or IIOP protocol
- Sending specially crafted requests that bypass authentication mechanisms
- Accessing critical data or complete server-accessible data without providing valid credentials
The exploitation requires no privileges and has low attack complexity, making it accessible to attackers with basic technical capabilities. Organizations with WebLogic Server instances exposed to untrusted networks are at heightened risk.
Detection Methods for CVE-2024-21183
Indicators of Compromise
- Unusual connection patterns to WebLogic T3 ports (default 7001) from unauthorized sources
- Unexpected data access or query patterns in WebLogic Server logs without corresponding authentication events
- Network traffic anomalies involving T3 or IIOP protocol communications from external IP addresses
- Failed or missing authentication log entries followed by successful data access operations
Detection Strategies
- Monitor WebLogic Server access logs for requests to sensitive resources that lack corresponding authentication entries
- Implement network-level detection for T3 and IIOP protocol traffic from untrusted networks
- Deploy intrusion detection rules to identify exploitation attempts targeting WebLogic authentication bypass patterns
- Audit WebLogic Server configurations to identify instances with T3 or IIOP protocols exposed to untrusted networks
Monitoring Recommendations
- Enable detailed logging for T3 and IIOP protocol connections in WebLogic Server configurations
- Implement real-time alerting for authentication anomalies and unauthorized data access attempts
- Monitor network traffic to WebLogic Server ports for connections from unexpected sources or unusual volumes
- Establish baseline normal behavior patterns for T3/IIOP communications to detect deviations
How to Mitigate CVE-2024-21183
Immediate Actions Required
- Apply the Oracle Critical Patch Update (CPU) from July 2024 immediately to all affected WebLogic Server instances
- If immediate patching is not possible, restrict network access to T3 and IIOP protocols to trusted sources only
- Audit current WebLogic Server deployments to identify all instances running affected versions 12.2.1.4.0 or 14.1.1.0.0
- Implement network segmentation to limit exposure of WebLogic Server to untrusted networks
Patch Information
Oracle has released a security patch addressing this vulnerability as part of the Oracle Critical Patch Update July 2024. Organizations should download and apply the appropriate patches for their WebLogic Server versions from Oracle's support portal.
Before applying patches, ensure you have:
- Valid Oracle support credentials to access the patch downloads
- A tested rollback plan in case of compatibility issues
- Scheduled maintenance window for production systems
- Validated the patch in a non-production environment first
Workarounds
- Disable T3 and IIOP protocols if they are not required for your application architecture
- Implement network-level access controls (firewalls, ACLs) to restrict T3/IIOP access to trusted IP addresses only
- Use connection filters in WebLogic Server to limit protocol access to authorized clients
- Enable and enforce mutual TLS authentication for T3 protocol connections where supported
# Example WebLogic connection filter configuration
# Add to config.xml to restrict T3 protocol access
# Step 1: Create a connection filter file (e.g., netfilter.properties)
# Allow only trusted networks to access T3 protocol
# Syntax: <target> <localAddress> <action>
# Example filter rules:
# 192.168.1.0/24 * * allow
# 10.0.0.0/8 * * allow
# * * * deny
# Step 2: Configure filter in WebLogic Admin Console
# Navigate to: Domain > Security > Filter
# Set Connection Filter to: weblogic.security.net.ConnectionFilterImpl
# Set Connection Filter Rules with appropriate allow/deny entries
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
