CVE-2001-0312 in WebSphere Plugin
Summary
by MITRE
IBM WebSphere plugin for Netscape Enterprise server allows remote attackers to read source code for JSP files via an HTTP request that contains a host header that references a host that is not in WebSphere s host aliases list, which will bypass WebSphere processing.
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Analysis
by VulDB Data Team • 04/08/2019
This vulnerability exists in IBM WebSphere plugin for Netscape Enterprise Server and represents a significant security flaw that allows remote attackers to bypass WebSphere's normal processing mechanisms. The vulnerability stems from improper handling of host headers in HTTP requests, specifically when the host header references a domain that is not included in WebSphere's configured host aliases list. This misconfiguration creates an opportunity for attackers to directly access JSP source code files without proper authentication or authorization. The flaw operates at the application layer and exploits the trust relationship between the web server and the application server, allowing unauthorized information disclosure that could reveal sensitive application logic and implementation details. According to CWE-200, this represents a weakness where sensitive information is exposed to unauthorized actors, while the vulnerability aligns with ATT&CK technique T1566 for initial access through web application attacks.
The technical implementation of this vulnerability relies on the way WebSphere processes HTTP requests when the host header does not match its configured aliases. When an attacker crafts a request with a host header pointing to a non-alias domain, the WebSphere plugin fails to properly validate or intercept this request, allowing it to bypass the normal application server processing pipeline. This creates a path where JSP files can be accessed directly, revealing their source code content including embedded database queries, business logic, and potentially sensitive configuration parameters. The vulnerability demonstrates a classic case of insufficient input validation where the host header parameter is not properly sanitized or verified against the server's known host aliases. This misconfiguration essentially allows attackers to perform a form of path traversal or direct file access that should normally be prevented by the application server's security mechanisms.
The operational impact of this vulnerability extends beyond simple information disclosure, as the exposure of JSP source code provides attackers with valuable intelligence for crafting more sophisticated attacks. The source code may contain database connection strings, API keys, hardcoded credentials, or other sensitive data that could be leveraged for further exploitation. Additionally, the disclosure of application logic could enable attackers to identify additional vulnerabilities or develop targeted attacks against specific application components. This vulnerability particularly affects organizations using IBM WebSphere in conjunction with Netscape Enterprise Server, creating a potential attack surface that could be exploited by remote threat actors without requiring any special privileges or credentials. The impact is significant because it undermines the fundamental security model of web application servers where access control and application processing should be enforced regardless of how requests are received.
Organizations should implement immediate mitigations including configuring proper host alias validation within the WebSphere plugin settings to ensure that only authorized domains can be processed through the application server. The recommended approach involves updating the host aliases list to include only legitimate domains and implementing strict validation of host headers in all incoming requests. Network-level firewalls should be configured to restrict access to the WebSphere plugin endpoints, and organizations should consider implementing additional security layers such as web application firewalls that can detect and block malformed host headers. Regular security audits should verify that host header validation is properly configured and that no unauthorized domains are included in the alias lists. According to industry best practices and security frameworks, this vulnerability highlights the importance of proper input validation and the principle of least privilege in web application security, where all external inputs including host headers should be rigorously validated before being processed by application servers. Organizations should also consider implementing monitoring and alerting mechanisms to detect suspicious host header usage patterns that could indicate attempted exploitation of this vulnerability.