CVE-2002-2090 in Resin
Summary
by MITRE
Caucho Technology Resin server 2.1.1 to 2.1.2 allows remote attackers to obtain server s root path via requests for MS-DOS device names such as lpt9.xtp.
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Analysis
by VulDB Data Team • 08/30/2025
The vulnerability identified as CVE-2002-2090 affects Caucho Technology Resin server versions 2.1.1 through 2.1.2, representing a significant information disclosure flaw that enables remote attackers to obtain sensitive server root path information. This vulnerability specifically exploits the server's handling of requests for MS-DOS device names, particularly the lpt9.xtp example mentioned in the description, which demonstrates how the system fails to properly sanitize input containing device name patterns. The flaw exists in the web server's file access mechanisms where it does not adequately validate or filter requests containing device name patterns that could reveal underlying file system structures. This type of vulnerability falls under the CWE-200 category of "Information Exposure" and represents a classic case of improper input validation that allows attackers to glean system information through malformed requests.
The technical implementation of this vulnerability stems from the Resin server's inadequate filtering of file access requests that contain MS-DOS device names such as lpt9.xtp, which are typically reserved for printer ports in the Windows operating system. When an attacker submits a request containing such device names, the server processes these requests without proper validation, potentially causing the system to reveal its root directory path or other sensitive file system information. This behavior occurs because the server's request handling logic does not properly distinguish between legitimate file requests and malicious device name patterns that could be used to probe the underlying file system structure. The vulnerability demonstrates a lack of proper input sanitization and path traversal protection mechanisms within the web server's file access layer, making it susceptible to information disclosure attacks that can aid in further exploitation attempts.
The operational impact of CVE-2002-2090 extends beyond simple information disclosure, as the revealed root path information can serve as a critical stepping stone for attackers seeking to conduct more sophisticated attacks against the affected system. Once an attacker obtains the server's root path, they can use this information to map the file system structure, identify sensitive files, and potentially escalate privileges or access restricted resources. The vulnerability's remote nature means that attackers do not require local system access or authentication credentials to exploit it, making it particularly dangerous in publicly accessible web server environments. This type of vulnerability aligns with ATT&CK technique T1083 (File and Directory Discovery) and can contribute to broader reconnaissance activities that precede more destructive attacks. The exposure of root paths can also facilitate path traversal attacks and may enable attackers to identify configuration files, database credentials, or other sensitive information stored in predictable locations within the file system hierarchy.
Mitigation strategies for CVE-2002-2090 should focus on implementing robust input validation and sanitization mechanisms within the web server's request handling processes. Organizations should immediately upgrade to Resin server versions 2.1.3 or later, which contain patches addressing this specific vulnerability. Additionally, implementing proper request filtering that blocks or sanitizes requests containing MS-DOS device names and other potentially malicious patterns can prevent exploitation. Network-level protections such as web application firewalls and intrusion prevention systems should be configured to detect and block requests containing device name patterns that could trigger this vulnerability. The implementation of proper access controls and least privilege principles can also limit the impact of successful exploitation attempts, while regular security audits and penetration testing can help identify similar vulnerabilities in other components of the web application infrastructure. This vulnerability highlights the critical importance of input validation and proper error handling in web server implementations, as outlined in security best practices and standards such as those defined by the OWASP Top Ten and NIST guidelines for secure web application development.