CVE-2018-7719 in Server
Summary
by MITRE
Acrolinx Server before 5.2.5 on Windows allows Directory Traversal.
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Analysis
by VulDB Data Team • 10/20/2025
The Acrolinx Server vulnerability CVE-2018-7719 represents a critical directory traversal flaw affecting versions prior to 5.2.5 on Windows operating systems. This vulnerability falls under the CWE-22 category, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The flaw enables malicious actors to access files and directories outside the intended scope by manipulating file path references through crafted input.
The technical implementation of this vulnerability occurs within the Acrolinx Server's file handling mechanisms on Windows platforms. Attackers can exploit this weakness by submitting specially crafted requests that contain directory traversal sequences such as ..\ or ../, allowing them to navigate beyond the server's intended file access boundaries. This occurs due to insufficient input validation and sanitization of file path parameters, particularly in file upload, download, or retrieval operations. The vulnerability specifically impacts Windows installations where the server processes user-supplied file paths without proper normalization or restriction mechanisms.
The operational impact of this vulnerability is substantial and multifaceted. An attacker who successfully exploits this directory traversal flaw can potentially access sensitive server files including configuration files, log files, application source code, and other system resources that should remain protected. This unauthorized access could lead to information disclosure, system compromise, and potentially full system control depending on the privileges of the Acrolinx service account. The vulnerability also poses risks to data integrity and confidentiality, as attackers might be able to modify or delete critical system files. Additionally, this weakness can serve as a stepping stone for further attacks within the network infrastructure, aligning with ATT&CK technique T1083 (File and Directory Discovery) and T1566 (Phishing for Information) tactics.
Organizations utilizing Acrolinx Server versions prior to 5.2.5 should immediately implement mitigations including applying the vendor-provided patch or upgrade to version 5.2.5 or later. Network segmentation and firewall rules should be implemented to restrict access to the Acrolinx server from untrusted networks. Input validation mechanisms should be strengthened to properly sanitize all file path parameters, and the principle of least privilege should be enforced for the Acrolinx service account. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other components of the system. The vulnerability demonstrates the importance of proper input validation and access control mechanisms, which aligns with security frameworks such as NIST SP 800-53 and ISO 27001 requirements for secure application development and system hardening practices.