CVE-2001-0760 in Nfuse
Summary
by MITRE
Citrix Nfuse 1.51 allows remote attackers to obtain the absolute path of the web root via a malformed request to launch.asp that does not provide the session field.
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Analysis
by VulDB Data Team • 10/04/2025
The vulnerability identified as CVE-2001-0760 affects Citrix Nfuse 1.51, a web-based application delivery and access platform that enables users to access enterprise applications through a web browser interface. This security flaw represents a path disclosure vulnerability that occurs when the application fails to properly validate incoming requests to the launch.asp component. The issue manifests when remote attackers submit malformed requests that omit the required session field parameter, causing the system to reveal sensitive information about its file system structure. This type of vulnerability falls under the category of information disclosure flaws that can provide attackers with valuable reconnaissance data about the target environment.
The technical implementation of this vulnerability stems from improper input validation within the launch.asp script that processes user requests. When a request is made without the session field parameter, the application does not adequately sanitize or validate the input before processing it. Instead of gracefully handling the missing parameter or returning an appropriate error message, the system inadvertently exposes the absolute path of the web root directory. This occurs because the application's error handling mechanism includes the full file path in error messages or response data, allowing an attacker to discover the underlying file system structure. According to CWE-200, this vulnerability maps directly to information exposure through error messages, where sensitive system information is inadvertently disclosed to unauthorized users.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with critical reconnaissance data that can be leveraged for subsequent attacks. The disclosed absolute path information enables attackers to understand the application's directory structure, potentially identifying other vulnerable components or misconfigurations within the system. This information can facilitate further exploitation attempts, including directory traversal attacks or attempts to access sensitive configuration files. The vulnerability aligns with ATT&CK technique T1083 (File and Directory Discovery) as it allows adversaries to map the file system structure of the affected system. Additionally, the exposure of the web root path can help attackers identify potential attack vectors such as backup files, temporary directories, or other system components that may contain sensitive data or configuration information.
Organizations utilizing Citrix Nfuse 1.51 should implement immediate mitigations to address this vulnerability. The primary solution involves updating to a patched version of the Citrix Nfuse software that properly validates input parameters and implements secure error handling mechanisms. System administrators should also consider implementing input validation rules that require all expected parameters to be present in incoming requests, with proper sanitization of user inputs before processing. Network-level protections such as web application firewalls can help detect and block malformed requests that attempt to exploit this vulnerability. The vulnerability demonstrates the critical importance of proper error handling in web applications, where insecure error messages can inadvertently provide attackers with system information that would otherwise remain hidden. Organizations should also conduct thorough security assessments to identify other potential information disclosure vulnerabilities within their web applications and ensure that all error handling mechanisms properly sanitize output to prevent the disclosure of system paths or other sensitive information.