CVE-2002-0937 in JRun
Summary
by MITRE
The Java Server Pages (JSP) engine in JRun allows web page owners to cause a denial of service (engine crash) on the web server via a JSP page that calls WPrinterJob().pageSetup(null,null).
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Analysis
by VulDB Data Team • 04/20/2025
The vulnerability identified as CVE-2002-0937 represents a critical denial of service flaw within the Java Server Pages engine of Macromedia JRun web server software. This vulnerability specifically targets the JSP processing capabilities of the application server, allowing malicious actors to exploit a flaw in the WPrinterJob class implementation that leads to complete service disruption. The vulnerability stems from improper handling of null parameters within the pageSetup method of the WPrinterJob class, which causes the JSP engine to crash when processing specific JSP pages containing this method call.
The technical exploitation of this vulnerability occurs through the deliberate crafting of JSP pages that invoke the WPrinterJob().pageSetup(null,null) method call. This particular method invocation triggers an unhandled exception within the JRun server's JSP engine, causing the web server process to terminate unexpectedly. The flaw exists at the application level where the JSP engine fails to properly validate or handle null parameters passed to the printer job setup functionality. This type of vulnerability falls under CWE-470: Use of Externally-Controlled Input to Select Code, as the JSP page content can be controlled by external parties and directly influences the execution path of the server's code. The vulnerability demonstrates poor error handling practices and inadequate input validation within the JSP processing pipeline.
The operational impact of this vulnerability extends beyond simple service interruption as it can be leveraged to disrupt web applications hosted on affected JRun servers. Attackers can exploit this flaw by simply uploading or accessing a malicious JSP page that contains the problematic method call, resulting in immediate denial of service conditions that affect all users of the affected web server. The vulnerability affects the availability aspect of the CIA security triad and can potentially be used in coordinated attacks against web applications. From an ATT&CK framework perspective, this vulnerability maps to T1499.004: Endpoint Denial of Service, as it specifically targets endpoint availability through application-level service disruption. The impact is particularly severe for web applications that rely heavily on JRun's JSP capabilities and cannot tolerate service interruptions.
Mitigation strategies for CVE-2002-0937 should focus on immediate patching of the affected JRun software versions, as Macromedia released updates to address this specific vulnerability. Organizations should implement proper input validation and sanitization measures for JSP pages, particularly when dealing with printer-related functionality or external user input that could influence code execution paths. Network-level protections including web application firewalls and access controls can help prevent unauthorized users from uploading malicious JSP content. Additionally, system administrators should monitor for suspicious JSP page access patterns and implement proper logging mechanisms to detect potential exploitation attempts. The vulnerability highlights the importance of secure coding practices and proper error handling in server-side applications, particularly when dealing with external input that can influence program flow. Regular security assessments and vulnerability scanning should be conducted to identify similar flaws in other application components that may exhibit similar patterns of improper parameter handling and error management.