CVE-2025-5740 in EVLink WallBox
Summary
by MITRE • 06/10/2025
CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability exists that could cause arbitrary file writes when an unauthenticated user on the web server manipulates file path.
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Analysis
by VulDB Data Team • 10/07/2025
This vulnerability represents a critical path traversal flaw classified under CWE-22 that enables unauthorized file system manipulation through web server interfaces. The vulnerability occurs when input validation fails to properly restrict file path operations, allowing attackers to bypass directory restrictions and access or modify files outside the intended application directories. Such flaws typically arise when applications directly use user-supplied input to construct file paths without adequate sanitization or validation mechanisms.
The technical implementation of this vulnerability stems from insufficient input filtering and path normalization routines within the web application's file handling components. Attackers can exploit this weakness by crafting malicious file path sequences that traverse directory structures using techniques such as double dots ../ or directory separators that allow navigation beyond the restricted directories. When unauthenticated users can manipulate these pathways, the attack surface expands significantly as no authentication barriers exist to prevent malicious file operations.
Operational impact of this vulnerability extends beyond simple data theft to encompass complete system compromise scenarios. Successful exploitation can lead to arbitrary file creation, modification, or deletion across the file system, potentially enabling attackers to install malicious code, overwrite critical system files, or establish persistent backdoors. The vulnerability's severity increases substantially when combined with other weaknesses such as insufficient access controls or inadequate logging mechanisms that prevent detection of unauthorized file operations. This type of vulnerability directly violates the principle of least privilege and can result in privilege escalation scenarios when system files are modified.
Mitigation strategies should focus on implementing robust input validation, canonicalizing file paths, and enforcing strict access controls for file operations. Organizations should deploy proper path normalization techniques that resolve relative paths to absolute paths within designated directories, implement whitelist-based input validation, and ensure that all file operations occur within restricted sandboxed environments. The implementation of secure coding practices aligned with owasp top ten guidelines and defense in depth principles should be prioritized. Additionally, regular security testing including dynamic application security testing and static code analysis should be conducted to identify and remediate similar vulnerabilities before exploitation occurs. This vulnerability type is commonly mapped to attack techniques in the mitre att&ck framework under the file and directory permissions category, specifically targeting persistence and privilege escalation tactics.