CVE-2000-1052 in JRun
Summary
by MITRE
Allaire JRun 2.3 server allows remote attackers to obtain source code for executable content by directly calling the SSIFilter servlet.
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Analysis
by VulDB Data Team • 10/11/2025
The vulnerability identified as CVE-2000-1052 affects Allaire JRun 2.3 server implementations and represents a critical security flaw in web application server software. This vulnerability stems from improper access controls within the SSIFilter servlet component, which is designed to process server-side includes but fails to adequately validate incoming requests. The flaw allows remote attackers to bypass normal access restrictions and directly access executable content that should otherwise remain protected within the server's file system. This represents a significant compromise in the security model of the web server, as it enables unauthorized access to sensitive source code and executable content that typically would be restricted to authorized users or system processes.
The technical implementation of this vulnerability exploits a weakness in the servlet's request handling mechanism where input validation is insufficient or completely absent. When attackers make specific requests to the SSIFilter servlet, they can manipulate the parameters to traverse the file system and retrieve source code files that contain executable content. This occurs because the servlet does not properly sanitize user input or implement adequate access controls to verify that the requesting entity has legitimate authorization to access the requested resources. The vulnerability operates at the application layer and can be exploited without requiring authentication or prior access to the system, making it particularly dangerous for publicly accessible web servers.
The operational impact of CVE-2000-1052 extends beyond simple information disclosure, as the exposure of source code provides attackers with detailed insights into application architecture, business logic, and potentially sensitive implementation details. This information can be leveraged to identify additional vulnerabilities within the application or to develop more sophisticated attack vectors targeting the web server or underlying systems. The vulnerability can result in complete compromise of the affected server if attackers can also execute malicious code or use the exposed source code to craft targeted attacks against other systems in the network. Organizations running affected JRun servers face significant risk of data breaches, intellectual property theft, and potential system compromise that could affect multiple applications hosted on the vulnerable server.
This vulnerability aligns with CWE-200, which addresses improper information exposure, and can be mapped to ATT&CK technique T1566 for initial access through malicious web content. The flaw demonstrates poor input validation practices and inadequate access control mechanisms that are commonly exploited in web application attacks. Organizations should implement immediate mitigations including patching the affected JRun server to a version that addresses this vulnerability, implementing proper access controls for servlet components, and configuring web server security to prevent direct access to sensitive application components. Additionally, network segmentation and firewall rules should be implemented to restrict access to the vulnerable servlet endpoints, while comprehensive monitoring should be deployed to detect suspicious access patterns that may indicate exploitation attempts.
The broader implications of this vulnerability highlight the importance of proper access control implementation in web application servers and the critical need for thorough security testing of server components. This flaw represents a classic example of how insufficient input validation and access control can create severe security risks, particularly in enterprise web server environments where multiple applications may be hosted on a single platform. Organizations should conduct comprehensive security assessments of their web application server configurations to identify similar vulnerabilities and ensure that all server components implement proper authorization mechanisms to prevent unauthorized access to sensitive resources.