CVE-2000-0498 in eWave ServletExec
Summary
by MITRE
Unify eWave ServletExec 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 • 06/26/2024
The vulnerability identified as CVE-2000-0498 affects the Unify eWave ServletExec web application server, representing a critical security flaw in how the system handles case-sensitive URL requests. This vulnerability specifically targets the server's handling of java server pages with uppercase file extensions, creating an unintended information disclosure channel that exposes sensitive source code to remote attackers. The flaw stems from the server's improper processing of Uniform Resource Locators where the jsp file extension is presented in uppercase letters, which the system fails to properly normalize or validate before serving content.
The technical implementation of this vulnerability occurs at the web server's request processing layer where the servlet container does not properly canonicalize URL paths before attempting to serve JSP content. When an attacker submits a request with a jsp extension in uppercase characters such as .JSP instead of .jsp, the server fails to recognize this as equivalent to a standard jsp file and instead provides access to the raw source code of the JSP program. This behavior violates fundamental security principles of access control and information hiding, as the system should maintain consistent behavior regardless of case variations in file extensions.
The operational impact of this vulnerability extends beyond simple information disclosure, as the exposure of JSP source code provides attackers with detailed insights into the application's logic, database connection strings, and potentially sensitive business logic. This source code exposure enables sophisticated attacks including but not limited to code injection exploitation, business logic manipulation, and targeted attacks against specific application components. The vulnerability creates an attack surface that allows for comprehensive reconnaissance of the web application architecture and can significantly accelerate subsequent attack phases. According to CWE classification, this represents a weakness in the system's input validation and canonicalization processes, specifically CWE-20 and CWE-1107, which address improper input validation and failure to canonicalize before validating respectively.
The attack vector for this vulnerability is straightforward and requires minimal technical expertise to exploit, making it particularly dangerous in environments where automated scanning tools may identify and exploit such flaws. Attackers can leverage this vulnerability through simple HTTP requests without requiring authentication or complex exploitation techniques. The ATT&CK framework categorizes this as a reconnaissance technique under initial access and privilege escalation phases, as the source code exposure provides attackers with essential information for planning more sophisticated attacks. Organizations running affected versions of Unify eWave ServletExec face significant risk of application-level compromise, as the exposed source code often contains sensitive implementation details that can be used to bypass security controls or exploit other vulnerabilities.
Mitigation strategies for this vulnerability require immediate patching of the affected software version, as the flaw exists in the core processing logic of the web server. System administrators should implement URL normalization policies at the web server level to ensure consistent handling of case variations in file extensions. Additionally, organizations should conduct comprehensive source code reviews to identify other potential case sensitivity issues within their web applications and implement proper access controls to prevent unauthorized access to source code files. Network segmentation and web application firewalls can provide additional layers of protection, though these measures are secondary to the fundamental patching approach recommended by security vendors and CERT/CC advisories issued for this vulnerability.