CVE-2023-21837 in WebLogic Server
Summary
by MITRE • 01/18/2023
Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Core). Supported versions that are affected are 12.2.1.3.0, 12.2.1.4.0 and 14.1.1.0.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via IIOP to compromise Oracle WebLogic Server. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Oracle WebLogic Server accessible data. CVSS 3.1 Base Score 7.5 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).
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Analysis
by VulDB Data Team • 09/17/2024
The vulnerability identified as CVE-2023-21837 represents a critical security flaw within Oracle WebLogic Server's Core component, specifically affecting versions 12.2.1.3.0, 12.2.1.4.0, and 14.1.1.0.0 within the Oracle Fusion Middleware suite. This vulnerability operates at the IIOP (Internet Inter-ORB Protocol) layer, which serves as a fundamental communication mechanism for distributed object services in Java-based enterprise applications. The flaw enables exploitation by unauthenticated attackers who possess network access, making it particularly dangerous as it eliminates the need for prior authentication credentials or privileged access. The CVSS 3.1 scoring system assigns this vulnerability a base score of 7.5, classified as high severity, with the primary impact focused on confidentiality as indicated by the vector (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N). The vulnerability's accessibility characteristics reveal that it requires no user interaction and can be exploited from a network location, while the low attack complexity suggests that skilled attackers can readily implement the exploit.
The technical nature of this vulnerability stems from insufficient input validation or improper access controls within the IIOP communication channel of Oracle WebLogic Server. IIOP is designed to enable communication between distributed objects across different platforms and programming languages, but this particular implementation flaw allows malicious actors to bypass normal authentication mechanisms. The vulnerability's exploitation pathway involves leveraging the IIOP protocol to gain unauthorized access to the server's internal data structures and resources, potentially enabling attackers to extract sensitive information or establish persistent access to critical enterprise data. This represents a fundamental breakdown in the server's security architecture, as the IIOP endpoint should normally require proper authentication and authorization before granting access to server resources. The affected versions indicate this vulnerability has persisted across multiple release streams of Oracle WebLogic Server, suggesting a systemic issue within the core protocol handling rather than a localized bug.
The operational impact of CVE-2023-21837 extends far beyond simple data exposure, as successful exploitation can result in complete compromise of all accessible data within the Oracle WebLogic Server environment. Organizations utilizing affected versions face significant risk of data breaches, intellectual property theft, and potential disruption of business-critical applications that depend on WebLogic Server for their operation. The vulnerability's ability to grant unauthorized access to critical data without requiring authentication creates a pathway for attackers to escalate their privileges and move laterally within network environments. This scenario aligns with ATT&CK framework technique T1071.004 for application layer protocols, where adversaries exploit communication protocols to gain unauthorized access. The confidentiality impact rating of high severity indicates that attackers could potentially access sensitive business information, customer data, financial records, or proprietary application data that organizations rely on for competitive advantage. Organizations running these vulnerable versions may experience cascading security failures if the compromised server hosts applications with interconnected dependencies, potentially affecting entire enterprise ecosystems.
Mitigation strategies for CVE-2023-21837 must prioritize immediate action through official Oracle patches and updates, as the vulnerability's ease of exploitation demands urgent attention from security teams. Organizations should implement network segmentation to restrict access to IIOP ports and consider blocking IIOP traffic at firewalls and network boundaries until patches are deployed. The principle of least privilege should be enforced by disabling unnecessary IIOP endpoints and ensuring that only required services remain accessible. Security monitoring should focus on detecting unusual network traffic patterns related to IIOP communication and unauthorized access attempts. Compliance with industry standards such as those outlined in CWE-284 (Improper Access Control) and CWE-312 (Sensitive Data Exposure) becomes critical, as these vulnerabilities directly relate to access control mechanisms and data protection failures. Organizations should also conduct comprehensive vulnerability assessments to identify other potential IIOP-related vulnerabilities within their Oracle WebLogic Server deployments and consider implementing additional security controls such as intrusion detection systems and network access controls to monitor for exploitation attempts. Regular security audits and penetration testing should be performed to validate the effectiveness of implemented mitigations and ensure continued protection against similar vulnerabilities.