CVE-2024-28072 in Serv-U
Summary
by MITRE • 05/03/2024
A highly privileged account can overwrite arbitrary files on the system with log output. The log file path tags were not sanitized properly.
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Analysis
by VulDB Data Team • 02/25/2025
This vulnerability represents a critical privilege escalation vector that allows highly privileged accounts to manipulate system files through improper log file path handling. The core technical flaw stems from insufficient input validation and sanitization of log file path tags, which creates an arbitrary file overwrite condition. When privileged accounts generate log entries, the system fails to properly sanitize the path components used in log file generation, enabling attackers to inject malicious path references that can overwrite critical system files or binaries. This vulnerability directly maps to CWE-939 which addresses improper neutralization of special elements used in file paths, and aligns with ATT&CK technique T1548.001 related to abuse of privileges for privilege escalation. The operational impact is severe as it allows attackers with access to highly privileged accounts to potentially corrupt system integrity, install backdoors, or disable security controls by overwriting critical system files. The vulnerability exists at the application level where log management components fail to implement proper path validation mechanisms, creating a direct pathway for attackers to manipulate the file system through legitimate logging operations.
The exploitation of this vulnerability requires an attacker to already possess access to a highly privileged account, which significantly reduces the attack surface but does not eliminate the risk entirely. Attackers can leverage this weakness by crafting log entries that contain specially formatted path references which bypass normal file system access controls. The lack of proper sanitization means that path traversal sequences or other malicious path components can be injected into the log file paths, allowing arbitrary file overwrite operations. This flaw particularly affects systems where logging is configured to use user-supplied or variable path components without proper validation. The vulnerability demonstrates a fundamental failure in secure coding practices related to input validation and path handling, creating a dangerous condition where legitimate system operations can be weaponized for malicious purposes. Organizations implementing logging frameworks should ensure that all path components used in log file generation undergo strict validation and sanitization to prevent path injection attacks.
Mitigation strategies must focus on implementing comprehensive input validation and sanitization of all path-related components used in logging operations. The most effective approach involves applying strict path validation that rejects any path containing traversal sequences, special characters, or components that could lead to arbitrary file access. Organizations should implement a principle of least privilege for logging operations and ensure that log file paths are generated using fixed, validated components rather than user-supplied input. Regular security auditing of logging configurations and path handling implementations should be conducted to identify potential injection points. Additionally, implementing file system access controls and monitoring for unauthorized file modifications can help detect exploitation attempts. The solution should include proper error handling that prevents path injection through logging mechanisms and ensures that all path components are validated against a whitelist of acceptable values. System administrators should also consider implementing centralized logging with strict path validation rules to prevent local privilege escalation through logging vulnerabilities. This vulnerability underscores the importance of secure coding practices and proper input validation in system security design.