CVE-2025-34118 in VOS Manager
Summary
by MITRE • 07/17/2025
A path traversal vulnerability exists in Linknat VOS Manager versions prior to 2.1.9.07, including VOS2009 and early VOS3000 builds, that allows unauthenticated remote attackers to read arbitrary files on the server. The vulnerability is accessible via multiple localized subpaths such as '/eng/', '/chs/', or '/cht/', where the 'js/lang_en_us.js' or equivalent files are loaded. By injecting encoded traversal sequences such as '%c0%ae%c0%ae' into the request path, attackers can bypass input validation and disclose sensitive files.
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Analysis
by VulDB Data Team • 07/17/2025
This vulnerability represents a critical path traversal flaw in Linknat VOS Manager software that affects versions prior to 2.1.9.07 including VOS2009 and early VOS3000 builds. The security weakness stems from inadequate input validation mechanisms within the application's file loading functionality, specifically when processing requests directed to localized subpaths such as '/eng/', '/chs/', or '/cht/'. These paths are designed to serve language-specific javascript files like 'js/lang_en_us.js' but fail to properly sanitize user-supplied input, creating an exploitable condition where attackers can manipulate the request path to access arbitrary files on the underlying server filesystem.
The technical exploitation mechanism relies on the insertion of encoded traversal sequences such as '%c0%ae%c0%ae' into the request path, which effectively translates to double dot characters in the URL decoding process. This encoding bypasses standard input validation checks that might otherwise detect direct path traversal attempts using conventional sequences like '../'. The vulnerability operates at the application layer and requires no authentication credentials, making it particularly dangerous as it can be exploited by remote attackers without prior access to the system. The flaw demonstrates poor secure coding practices and inadequate sanitization of user-controllable input parameters that should be rigorously validated against known safe patterns.
The operational impact of this vulnerability is severe as it allows attackers to gain unauthorized access to sensitive files stored on the server, potentially including configuration files, database credentials, application source code, and other confidential data. This arbitrary file reading capability can lead to complete system compromise, data exfiltration, and further lateral movement within the network. Attackers could leverage this vulnerability to discover system information, access administrative interfaces, or extract proprietary code that could be used for additional attacks. The unauthenticated nature of the exploit means that any remote party can attempt to exploit this weakness without requiring valid credentials or privileged access, significantly increasing the attack surface and potential damage.
Organizations using affected versions of Linknat VOS Manager should immediately implement mitigation strategies including updating to version 2.1.9.07 or later, which contains the necessary patches to address the path traversal vulnerability. Network segmentation and firewall rules should be implemented to restrict access to the affected application's endpoints, particularly the localized subpaths that are vulnerable. Input validation should be strengthened to reject any sequences that could be used for path traversal attacks, and the principle of least privilege should be enforced by limiting file access permissions on the server. Additionally, security monitoring should be enhanced to detect unusual patterns in request paths that might indicate exploitation attempts. This vulnerability aligns with CWE-22 Path Traversal and maps to ATT&CK technique T1059 Command and Scripting Interpreter, specifically focusing on the exploitation of file system access vulnerabilities. Regular security assessments and penetration testing should be conducted to identify similar weaknesses in other applications and systems within the organization's infrastructure.