CVE-2000-0497 in WebSphere Application Server
Summary
by MITRE
IBM WebSphere server 3.0.2 allows a remote attacker to view source code of a JSP program by requesting a URL which provides the JSP extension in upper case.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 10/14/2025
The vulnerability identified as CVE-2000-0497 represents a critical security flaw in IBM WebSphere Application Server version 3.0.2 that exposes sensitive source code information to remote attackers. This issue stems from improper case sensitivity handling within the server's request processing mechanism, specifically affecting how the system interprets file extensions in Uniform Resource Locators. The vulnerability operates under the weakness category of information disclosure, which falls under the Common Weakness Enumeration framework as CWE-200, where sensitive information is exposed to unauthorized actors.
The technical implementation of this flaw occurs when an attacker crafts a URL request using uppercase JSP file extensions rather than the standard lowercase format. The IBM WebSphere server, due to its flawed case handling logic, fails to properly normalize the file extension before processing the request, resulting in the server returning the raw source code of the JSP file instead of executing it as intended. This behavior demonstrates a classic case of improper input validation and insufficient sanitization of user-supplied data, which can be categorized under ATT&CK technique T1566.001 for credential access through social engineering and T1068 for exploiting remote services.
The operational impact of this vulnerability extends beyond simple information disclosure, as the exposure of JSP source code provides attackers with complete insight into application logic, database connection strings, user credentials, and potentially sensitive business logic implementations. This information can be leveraged to craft more sophisticated attacks targeting other system components or to bypass security controls within the application. The vulnerability affects the confidentiality aspect of the CIA triad, as it allows unauthorized access to source code that typically contains proprietary information and security implementations.
Security practitioners should implement immediate mitigations including enforcing strict case sensitivity policies for file extensions, configuring web server rules to normalize URL requests, and implementing proper input validation controls. Additionally, organizations should conduct comprehensive audits of their web application servers to identify similar case sensitivity issues across different platforms and applications. The vulnerability highlights the importance of following secure coding practices and proper input validation as outlined in OWASP Top Ten security principles, particularly focusing on preventing information leakage and ensuring proper request handling mechanisms. Regular security updates and patches should be implemented to address such vulnerabilities, as IBM would have likely released fixes for this specific issue in subsequent versions of their WebSphere application server.