CVE-2000-1238

Step 1: Target Identification: Identify a WebLogic Server 5.1 SP1-SP6 instance. Step 2: Restricted Resource Discovery: Identify a restricted JSP or servlet page (e.g., a page requiring authentication). Step 3: Payload Construction: Craft a URL that includes multiple forward slashes before the path to the restricted resource (e.g., http://target.com////restricted.jsp). Step 4: Request Submission: Send the crafted URL to the vulnerable WebLogic Server. Step 5: Access Control Bypass: The server's flawed URL parsing allows the request to bypass access controls. Step 6: Unauthorized Access: The attacker gains access to the restricted resource, potentially exposing sensitive data or functionality.

The vulnerability lies in the way BEA WebLogic Server 5.1 SP1-SP6 handles URLs containing multiple forward slashes ('/'). The server's URL parsing logic fails to correctly normalize the path, allowing an attacker to craft a URL that bypasses access control restrictions. Specifically, the server's access control checks are performed on a simplified, potentially incomplete, path representation. The vulnerability is a path traversal issue. The server's logic for determining if a user has access to a resource does not correctly handle multiple slashes in the URL, allowing an attacker to craft a URL that bypasses the intended access controls. The root cause is a flaw in the URL parsing logic, which does not adequately sanitize or normalize the URL before performing access control checks. This allows an attacker to craft a malicious URL that, when processed, grants access to restricted resources.