CVE-2000-1051 in JRun
Summary
by MITRE
Directory traversal vulnerability in Allaire JRun 2.3 server allows remote attackers to read arbitrary files via the SSIFilter servlet.
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Analysis
by VulDB Data Team • 05/19/2019
The CVE-2000-1051 vulnerability represents a critical directory traversal flaw in Allaire JRun 2.3 web server software that fundamentally compromises the security boundaries of web applications. This vulnerability specifically affects the SSIFilter servlet component which processes server-side includes and fails to properly validate user input containing directory path references. The flaw enables remote attackers to bypass normal access controls and retrieve arbitrary files from the underlying file system by manipulating path traversal sequences in their requests. Such vulnerabilities are classified under CWE-22 as "Improper Limitation of a Pathname to a Restricted Directory" and align with ATT&CK technique T1566.1001 for "Phishing with Malicious File" when exploited in web-based attack scenarios.
The technical implementation of this vulnerability stems from insufficient input sanitization within the SSIFilter servlet where user-supplied parameters containing file paths are directly processed without adequate validation or canonicalization. Attackers can exploit this by crafting malicious requests that include directory traversal sequences such as "../" or "..\\" to navigate outside the intended web root directory. When the servlet processes these requests, it fails to normalize the file paths properly, allowing the web server to serve files from arbitrary locations on the file system. This creates a dangerous privilege escalation scenario where unauthorized users can access sensitive files including configuration files, source code, database files, and system credentials that should normally be protected from web access.
The operational impact of CVE-2000-1051 extends far beyond simple information disclosure, as it provides attackers with comprehensive access to the underlying system's file structure. Successful exploitation can lead to complete system compromise through access to application configuration files containing database credentials, system administration files, and potentially source code repositories. The vulnerability affects not only the immediate web application but also the entire server infrastructure, as attackers can leverage this flaw to gather intelligence about the system architecture, identify other potential vulnerabilities, and establish persistent access. This type of vulnerability is particularly dangerous in enterprise environments where JRun servers may host multiple applications with varying security requirements, potentially allowing attackers to move laterally across different application boundaries.
Mitigation strategies for CVE-2000-1051 require immediate implementation of input validation controls and proper path normalization within the web server configuration. Organizations should deploy web application firewalls that can detect and block directory traversal patterns in incoming requests, while also ensuring that all user-supplied input is properly sanitized before processing. The most effective long-term solution involves upgrading to patched versions of Allaire JRun or migrating to more modern application server platforms that have robust input validation mechanisms. Additionally, implementing principle of least privilege access controls, disabling unnecessary servlets and components, and conducting regular security audits of web application configurations can significantly reduce the attack surface. Organizations should also consider implementing automated monitoring solutions that can detect anomalous file access patterns indicative of directory traversal attacks, as this vulnerability often serves as a precursor to more sophisticated exploitation techniques.