CVE-2000-0499 in WebLogic Server
Summary
by MITRE
The default configuration of BEA WebLogic 3.1.8 through 4.5.1 allows a remote attacker to view source code of a JSP program by requesting a URL which provides the JSP extension in upper case.
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Analysis
by VulDB Data Team • 05/18/2019
The vulnerability identified as CVE-2000-0499 represents a critical security flaw in BEA WebLogic application server versions 3.1.8 through 4.5.1 that stems from improper case sensitivity handling in URL processing. This issue falls under the category of information disclosure vulnerabilities and is classified as CWE-200, which encompasses weaknesses that can lead to unauthorized information exposure. The flaw specifically manifests when the web server fails to properly normalize URL case sensitivity for jsp files, creating an unintended access path that allows remote attackers to retrieve source code of JSP applications.
The technical implementation of this vulnerability exploits the web server's directory traversal and file resolution mechanisms. When a remote attacker submits a request with a JSP file extension in uppercase letters such as .JSP instead of the standard lowercase .jsp, the affected WebLogic versions fail to properly handle the case variation and instead return the raw source code of the JSP file rather than executing it as intended. This behavior occurs because the server's internal file resolution logic does not perform case normalization on the file extension, allowing the request to bypass normal execution flow and trigger a source code disclosure rather than script execution.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with complete access to application source code, including embedded database connection strings, business logic implementations, and potentially sensitive configuration parameters. This exposure creates a significant risk for organizations deploying WebLogic servers in production environments, as the leaked source code can reveal implementation details that facilitate further exploitation attempts. The vulnerability affects the confidentiality aspect of the CIA triad and can be leveraged by threat actors to identify additional attack vectors within the application infrastructure.
Security practitioners should note that this vulnerability aligns with ATT&CK technique T1592.001, which involves reconnaissance through information gathering, and T1566.001, which covers social engineering via spearphishing. The flaw demonstrates how seemingly minor configuration issues can create substantial security risks, particularly in enterprise application servers where source code exposure can lead to full system compromise. Organizations should implement immediate mitigations including patching to supported versions, configuring URL case normalization rules, and ensuring proper access controls are in place to prevent unauthorized source code access.
The vulnerability highlights the importance of proper input validation and case handling in web application servers, as it demonstrates how a simple case sensitivity issue can create a critical security exposure. This weakness in WebLogic's URL processing logic represents a failure in proper security configuration management and underscores the need for comprehensive security testing that includes edge case scenarios. The issue also emphasizes the critical importance of keeping application servers updated with the latest security patches, as BEA WebLogic versions affected by this vulnerability were released prior to robust security hardening practices that are now standard in modern application server deployments.