CVE-2018-25421 in Open STA Manager
Summary
by MITRE • 05/30/2026
Open STA Manager 2.3 contains a path traversal vulnerability that allows authenticated users to download arbitrary files by manipulating the file parameter. Attackers can send GET requests to modules/backup/actions.php with op=getfile and traverse directories using ../ sequences to access sensitive system files.
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Analysis
by VulDB Data Team • 05/31/2026
The Open STA Manager 2.3 vulnerability represents a critical path traversal flaw that undermines the security posture of the application through improper input validation mechanisms. This vulnerability exists within the file handling functionality of the backup module, specifically in the actions.php file where the op=getfile parameter processes user-supplied file paths without adequate sanitization. The flaw allows authenticated users to manipulate directory traversal sequences using ../ patterns to access files outside the intended directory structure, creating an unauthorized access vector that can compromise sensitive system information.
From a technical perspective, this vulnerability operates as a classic path traversal attack where the application fails to properly validate or sanitize user input before using it in file system operations. The weakness manifests in the way the application processes the file parameter within the GET request to modules/backup/actions.php, where the ../ sequences are not properly filtered or restricted, allowing attackers to navigate upward through the directory hierarchy. This type of vulnerability falls under CWE-22 - Improper Limitation of a Pathname to a Restricted Directory and aligns with ATT&CK technique T1074.001 - Data Staged for Exfiltration, as it enables unauthorized access to staged backup files and system resources.
The operational impact of this vulnerability extends beyond simple file access, as authenticated users can potentially retrieve sensitive configuration files, database credentials, application source code, and other critical system artifacts that could be exploited for further compromise. Attackers can leverage this vulnerability to escalate their privileges within the application environment, potentially gaining access to administrative functions or extracting information that could aid in subsequent attacks. The vulnerability affects the principle of least privilege by allowing users to access resources they should not normally be able to reach, creating a significant security risk for organizations relying on the application for network management.
Security mitigations for this vulnerability should focus on implementing strict input validation and sanitization of all user-supplied file paths within the backup module. The application should enforce directory restrictions using absolute path validation, implement proper access controls, and sanitize all input parameters to prevent directory traversal sequences. Organizations should also consider implementing web application firewalls with path traversal detection capabilities and regularly audit file access controls within the application. Additionally, the vulnerability highlights the importance of following secure coding practices such as those outlined in OWASP Top Ten and NIST SP 800-53, particularly in areas related to input validation and access control mechanisms. The remediation process should include code review to ensure that all file handling operations properly validate user input and restrict access to predetermined directories, preventing unauthorized traversal beyond intended boundaries.