CVE-2000-0681 in WebLogic Server
Summary
by MITRE
Buffer overflow in BEA WebLogic server proxy plugin allows remote attackers to execute arbitrary commands via a long URL with a .JSP extension.
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Analysis
by VulDB Data Team • 10/13/2025
The vulnerability described in CVE-2000-0681 represents a critical buffer overflow condition within the BEA WebLogic Server proxy plugin that enables remote code execution through specially crafted HTTP requests. This flaw exists in the handling of Uniform Resource Locators that contain a .jsp extension, where the proxy plugin fails to properly validate input length before processing the request. The vulnerability specifically affects the web server plugin component that acts as an intermediary between the web server and the application server, creating a potential attack vector that can be exploited by malicious actors without authentication.
The technical implementation of this buffer overflow occurs when the proxy plugin receives a URL containing an excessive number of characters in the path portion, particularly when the extension is .jsp. The plugin's internal buffer allocation for processing these URLs is insufficient to handle the length of the input data, causing the program to overwrite adjacent memory locations. This memory corruption can be manipulated by attackers to inject and execute malicious code with the privileges of the web server process, typically running with elevated system permissions. The vulnerability is classified under CWE-121 as a stack-based buffer overflow, where the program writes beyond the bounds of a fixed-length buffer, leading to potential arbitrary code execution.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass complete system compromise and potential data breaches. Attackers can leverage this flaw to gain unauthorized access to the underlying operating system, potentially escalating privileges to root or system-level access depending on the server configuration. The attack can be executed without requiring any authentication credentials, making it particularly dangerous for systems exposed to the internet. Additionally, the vulnerability affects the integrity and availability of the web application services, as successful exploitation can lead to denial of service conditions or complete system takeover. The proxy plugin architecture means that the attack can potentially bypass traditional firewall rules and network segmentation controls that rely on URL-based filtering.
Mitigation strategies for CVE-2000-0681 require immediate patching of the BEA WebLogic Server software to address the buffer overflow condition in the proxy plugin component. Organizations should implement network-level controls such as web application firewalls and URL filtering mechanisms to restrict access to .jsp extensions and limit the length of URLs processed by the web server. Input validation should be enforced at multiple levels including the web server, application server, and proxy plugin components to prevent malformed URLs from reaching the vulnerable code paths. Security monitoring should be enhanced to detect unusual URL patterns and potential exploitation attempts. The remediation process should also include disabling unnecessary .jsp extensions in the web server configuration and implementing proper access controls to limit exposure of the vulnerable plugin to untrusted networks. Organizations should consider implementing the principle of least privilege for the web server processes and regularly review their security configurations to prevent similar vulnerabilities from being introduced through misconfigurations or outdated software components. This vulnerability demonstrates the importance of input validation and proper memory management in web server components and aligns with ATT&CK technique T1059 for command and scripting interpreter, specifically focusing on the execution of arbitrary code through buffer overflow exploits.