CVE-2001-1139 in WinWrapper
Summary
by MITRE
Directory traversal vulnerability in ASCII NT WinWrapper Professional allows remote attackers to read arbitrary files via a .. (dot dot) in the server request.
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Analysis
by VulDB Data Team • 06/10/2024
The vulnerability described in CVE-2001-1139 represents a classic directory traversal flaw within the ASCII NT WinWrapper Professional software, which operates as a web server component for windows environments. This vulnerability allows remote attackers to access files outside the intended directory structure by manipulating server requests with dot-dot sequences. The flaw exists in the server's handling of file path requests where input validation is insufficient to prevent traversal beyond the designated document root. The vulnerability specifically affects the web server functionality of WinWrapper Professional, which is designed to provide web-based access to windows applications and file systems. This type of vulnerability typically occurs when applications fail to properly sanitize user input before processing file system requests, creating opportunities for attackers to navigate the file system hierarchy and access sensitive data.
The technical implementation of this vulnerability stems from improper input validation and path handling within the web server component of ASCII NT WinWrapper Professional. When a client makes a request containing a .. sequence in the file path, the server fails to adequately sanitize this input, allowing the traversal to occur. The server processes the request without properly resolving the path or implementing access controls that would prevent navigation to parent directories. This behavior directly violates security principles of least privilege and input validation. The vulnerability can be exploited by constructing malicious URLs that include the .. (dot dot) sequences, effectively allowing attackers to traverse the file system and access files that should remain protected. This represents a fundamental flaw in how the server handles relative path references and demonstrates poor security design in the application's file access mechanisms. The vulnerability is categorized under CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks.
The operational impact of this vulnerability is significant as it provides attackers with unauthorized access to arbitrary files on the server system. Successful exploitation could allow attackers to read configuration files, application source code, user data, and other sensitive information stored on the server. The vulnerability enables attackers to bypass normal access controls and potentially gain access to system-level files that should be restricted. This could lead to information disclosure, system compromise, and further exploitation opportunities. Attackers might use this vulnerability to gather intelligence about the system, access user credentials stored in configuration files, or retrieve application source code that could reveal additional vulnerabilities. The impact extends beyond simple file access as it represents a fundamental breach in the server's security model, potentially enabling more sophisticated attacks such as privilege escalation or lateral movement within the network. This vulnerability is particularly dangerous in environments where the web server has access to sensitive system directories or where the application handles confidential data.
Mitigation strategies for this vulnerability involve implementing proper input validation and sanitization mechanisms within the web server component. The primary defense is to ensure that all user-supplied input containing file paths is properly validated and sanitized before processing. This includes implementing strict path resolution that prevents traversal beyond the intended document root directory. Organizations should configure the web server to reject or normalize any path components containing .. sequences or other traversal indicators. The implementation of proper access controls and privilege separation can also help limit the damage from such vulnerabilities. Security patches should be applied immediately if available for the affected version of ASCII NT WinWrapper Professional. Additionally, network segmentation and firewall rules can be implemented to restrict access to the vulnerable web server from untrusted networks. Monitoring and logging of file access attempts should be enabled to detect potential exploitation attempts. This vulnerability demonstrates the importance of following secure coding practices and implementing proper input validation as outlined in the OWASP Top Ten security principles. The remediation efforts should also include regular security assessments and penetration testing to identify similar vulnerabilities in other components of the system. Organizations should consider implementing web application firewalls and additional security layers to protect against this class of attacks. The vulnerability highlights the critical need for robust security controls in web server implementations and proper adherence to security standards such as those defined in the NIST Cybersecurity Framework and ISO 27001 security requirements.