CVE-2000-0684 in WebLogic Server
Summary
by MITRE
BEA WebLogic 5.1.x does not properly restrict access to the JSPServlet, which could allow remote attackers to compile and execute Java JSP code by directly invoking the servlet on any source file.
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Analysis
by VulDB Data Team • 04/03/2025
The vulnerability described in CVE-2000-0684 represents a critical access control flaw within BEA WebLogic Server version 5.1.x that fundamentally undermines the security model of the application server. This issue stems from improper restrictions in the JSPServlet component, which is responsible for processing Java Server Pages within the web container. The flaw allows remote attackers to bypass normal authentication and authorization mechanisms by directly accessing the JSPServlet endpoint, effectively granting them unrestricted access to compile and execute arbitrary Java code on the server. This represents a severe privilege escalation vulnerability that can be exploited from any network location without requiring prior authentication credentials.
The technical exploitation of this vulnerability occurs through direct invocation of the JSPServlet with maliciously crafted requests that target source files on the server filesystem. When an attacker accesses the servlet endpoint with specific parameters pointing to a .jsp file, the server processes the request and compiles the JSP code into executable Java bytecode without proper access validation. This behavior violates fundamental security principles of least privilege and proper input sanitization, as the system fails to verify whether the requesting entity has legitimate authorization to access the requested resource. The vulnerability specifically affects the JSP compilation and execution pipeline within WebLogic 5.1.x, where the servlet lacks proper access control checks before processing requests.
The operational impact of this vulnerability is devastating for organizations running affected WebLogic Server instances, as it provides attackers with complete code execution capabilities on the target system. Attackers can leverage this vulnerability to upload and execute malicious code, establish persistent backdoors, perform data exfiltration, and potentially escalate privileges to gain system-level access. The vulnerability enables remote code execution without requiring authentication, making it particularly dangerous for web applications that are publicly accessible. This flaw can be exploited to compromise entire server infrastructures, leading to data breaches, service disruption, and potential lateral movement within network environments. The vulnerability essentially transforms the web server into an unrestricted code execution platform that can be leveraged for various malicious activities.
Organizations affected by this vulnerability should implement immediate mitigations including applying the latest security patches provided by BEA Systems, which would have addressed the access control restrictions in the JSPServlet component. Network segmentation and firewall rules should be implemented to restrict access to the JSPServlet endpoint, while proper authentication and authorization mechanisms should be enforced at the application level. Input validation and sanitization measures should be strengthened to prevent malicious requests from reaching the vulnerable servlet. Additionally, security monitoring should be enhanced to detect suspicious access patterns to JSP servlet endpoints, and regular security assessments should be conducted to identify similar vulnerabilities in other application components. This vulnerability aligns with CWE-285, which addresses improper authorization issues, and maps to ATT&CK technique T1059 for command and scripting interpreter, specifically targeting the execution of malicious code through web application interfaces. The remediation approach should focus on implementing proper access controls, input validation, and network segmentation to prevent unauthorized access to critical server components.