CVE-2001-1512 in JRun
Summary
by MITRE
Unknown vulnerability in Allaire JRun 3.1 allows remote attackers to directly access the WEB-INF and META-INF directories and execute arbitrary JavaServer Pages (JSP), a variant of CVE-2000-1050.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 09/24/2025
The vulnerability identified as CVE-2001-1512 represents a critical directory traversal flaw within Allaire JRun 3.1 web application server software. This weakness stems from inadequate input validation and path resolution mechanisms that fail to properly sanitize user-supplied parameters before processing them within the application context. The vulnerability specifically affects the web server's handling of requests directed toward sensitive directories including WEB-INF and META-INF, which typically contain critical application configuration files, deployment descriptors, and other sensitive metadata that should remain inaccessible to remote users. The flaw enables attackers to bypass normal access controls and directly retrieve or execute files from these protected areas, creating a significant security breach that undermines the fundamental security boundaries of the web application.
The technical implementation of this vulnerability exploits the server's failure to properly validate and sanitize file path inputs, allowing malicious actors to construct specially crafted URLs that traverse the file system hierarchy. When a user submits a request containing directory traversal sequences such as "../", the server fails to properly resolve these paths, instead permitting access to files outside the intended web root directory. This behavior directly relates to CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal vulnerabilities. The impact extends beyond simple information disclosure to include arbitrary code execution capabilities through JSP files located within the accessible directories, making this a particularly dangerous flaw for web applications that rely on JSP technology for dynamic content generation and business logic processing.
The operational consequences of this vulnerability are severe and far-reaching for organizations utilizing Allaire JRun 3.1, as it provides attackers with direct access to sensitive application components and potentially allows for complete system compromise. Remote attackers can leverage this vulnerability to access configuration files that may contain database connection strings, cryptographic keys, and other sensitive credentials that are typically protected within the WEB-INF directory. Additionally, the ability to execute arbitrary JSP files means that malicious actors can deploy web shells, perform data exfiltration, or manipulate application behavior to conduct further attacks against the internal network infrastructure. The vulnerability's classification as a remote code execution flaw places it within the ATT&CK framework under techniques related to command and control, privilege escalation, and persistence mechanisms, making it a prime target for sophisticated attack campaigns.
Organizations affected by this vulnerability should immediately implement multiple layers of defensive measures to mitigate the risk. The primary remediation involves applying the official patches released by Allaire or upgrading to a supported version of the JRun application server that properly implements input validation and path sanitization. Network segmentation and firewall rules should be configured to restrict direct access to the web server, while additional security controls such as web application firewalls can provide an additional layer of protection against malicious path traversal attempts. Input validation should be implemented at multiple levels including application code, web server configuration, and network security devices to ensure comprehensive protection against similar vulnerabilities. Regular security assessments and penetration testing should be conducted to identify and remediate other potential path traversal vulnerabilities within the application stack, while security monitoring should be enhanced to detect suspicious file access patterns and unauthorized attempts to traverse directory structures. The vulnerability serves as a critical reminder of the importance of proper input validation and the potential consequences of inadequate security controls in web application servers.