CVE-2014-0043 in Wicket
Summary
by MITRE
In Apache Wicket 1.5.10 or 6.13.0, by issuing requests to special urls handled by Wicket, it is possible to check for the existence of particular classes in the classpath and thus check whether a third party library with a known security vulnerability is in use.
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Analysis
by VulDB Data Team • 11/21/2019
Apache Wicket represents a powerful Java web application framework that simplifies the development of rich internet applications through its component-based architecture and robust security mechanisms. The vulnerability identified in CVE-2014-0043 specifically targets the framework's URL handling mechanism, exposing a critical information disclosure flaw that allows attackers to enumerate classpath contents through carefully crafted requests. This vulnerability exists in versions 1.5.10 and 6.13.0 of the framework, where the application's internal routing and class resolution logic fails to properly validate user-supplied URL parameters against the underlying classpath structure.
The technical implementation of this vulnerability stems from Wicket's dynamic class loading and component resolution system, which processes incoming requests to determine appropriate handlers and components for rendering responses. When attackers submit specially crafted URLs that reference non-existent or specific class names, the framework's error handling reveals distinct response patterns depending on whether the requested classes exist within the application's classpath. This differential response behavior creates a timing-based information leakage mechanism that enables attackers to perform classpath enumeration attacks through systematic probing of class names. The vulnerability operates at the application level rather than at network or transport layers, making it particularly insidious as it leverages legitimate framework functionality to expose internal system state.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with crucial intelligence for subsequent exploitation attempts. By identifying the presence of specific third-party libraries within the application's classpath, adversaries can determine which known vulnerabilities might be present in the system. This reconnaissance capability significantly increases the attack surface and enables more targeted exploitation strategies, as attackers can focus their efforts on known vulnerabilities associated with specific library versions. The vulnerability aligns with CWE-200 (Information Exposure) and represents a classic example of how application-level logic flaws can create information leakage channels that undermine security controls. Security practitioners should note that this vulnerability enables a form of passive reconnaissance that can be automated and integrated into broader attack frameworks.
Mitigation strategies for this vulnerability require both immediate patching and architectural considerations to prevent similar issues in future development cycles. Organizations should immediately upgrade to patched versions of Apache Wicket that address this classpath enumeration vulnerability, as the framework maintainers have released updates that properly validate class references and normalize error responses. Additionally, implementing proper input validation at the application level, including sanitization of URL parameters and normalization of error handling responses, can prevent similar vulnerabilities from manifesting in custom implementations. Network-level protections such as web application firewalls can also provide additional defense-in-depth measures, though these should not replace proper application-level fixes. The vulnerability demonstrates the importance of following secure coding practices and adhering to the principle of least privilege in framework design, where error responses should not reveal internal system information that could aid attackers in their reconnaissance efforts. This issue also highlights the necessity of conducting thorough security reviews of framework components and their interaction patterns with user inputs, as such vulnerabilities can remain undetected for extended periods in complex application environments.