CVE-2020-14589 in WebLogic Server
Summary
by MITRE
Vulnerability in the Oracle WebLogic Server product of Oracle Fusion Middleware (component: Web Container). Supported versions that are affected are 10.3.6.0.0, 12.1.3.0.0, 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 HTTP to compromise Oracle WebLogic Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle WebLogic Server. CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
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Analysis
by VulDB Data Team • 11/01/2020
The vulnerability identified as CVE-2020-14589 represents a critical availability flaw within Oracle WebLogic Server's Web Container component, affecting multiple supported versions including 10.3.6.0.0, 12.1.3.0.0, 12.2.1.3.0, 12.2.1.4.0, and 14.1.1.0.0. This vulnerability resides within Oracle Fusion Middleware's web server infrastructure and demonstrates characteristics that make it particularly dangerous for enterprise environments relying on WebLogic Server for critical business operations. The flaw operates at the HTTP protocol level, making it accessible to attackers without requiring authentication or privileged access, which significantly increases the attack surface and exploitation potential. Security researchers have classified this vulnerability as easily exploitable due to its straightforward attack vector and minimal prerequisites for successful exploitation.
The technical nature of CVE-2020-14589 stems from improper input validation within the Web Container component that processes HTTP requests. When the server receives specially crafted HTTP requests, it fails to properly handle the malformed input, leading to a condition where the application becomes unresponsive or crashes repeatedly. This behavior manifests as a complete denial of service scenario where legitimate users cannot access the web application services hosted on the vulnerable WebLogic Server instances. The vulnerability's impact extends beyond simple service disruption as it can cause the server to enter a state where it repeatedly crashes and requires manual intervention to restore normal operation, effectively rendering the affected systems unusable for their intended purposes.
From an operational perspective, the implications of this vulnerability are severe for organizations that depend on Oracle WebLogic Server for their mission-critical applications and services. The CVSS 3.1 score of 7.5 indicates a high severity threat with availability impacts, meaning that successful exploitation can completely disable the targeted server instances. The lack of authentication requirements makes this vulnerability particularly dangerous as attackers can exploit it from any network location without needing credentials or prior access to the system. Organizations using affected versions of WebLogic Server face significant risk of service interruption, potential data loss, and business disruption when this vulnerability is actively exploited in the wild. The vulnerability's classification under CWE-20 (Improper Input Validation) aligns with common attack patterns documented in the MITRE ATT&CK framework, specifically relating to denial of service attacks and system availability compromise techniques.
Organizations should immediately implement mitigations including applying the official Oracle patches released as part of the January 2020 Critical Patch Update, which address this specific vulnerability. Network-level protections such as firewall rules, intrusion detection systems, and web application firewalls can provide additional layers of defense by filtering suspicious HTTP traffic patterns. Regular monitoring of system logs and network traffic for signs of exploitation attempts should be implemented to detect potential attacks before they cause significant disruption. Security teams should also consider implementing network segmentation to limit the potential impact of successful exploitation attempts and reduce the attack surface of vulnerable WebLogic Server instances. The vulnerability's characteristics align with ATT&CK technique T1499.004 (Endpoint Denial of Service) and demonstrate the importance of maintaining up-to-date security patches as a fundamental defense mechanism against known vulnerabilities.