CVE-2025-2539: File Away Information Disclosure Flaw

CVE-2025-2539 Overview

The File Away plugin for WordPress contains a critical authorization bypass vulnerability that allows unauthenticated attackers to read arbitrary files on the server. The vulnerability stems from a missing capability check on the ajax() function combined with the use of a reversible weak cryptographic algorithm, enabling attackers to access sensitive server files without authentication.

Critical Impact

Unauthenticated attackers can read arbitrary files on the server, potentially exposing WordPress configuration files, database credentials, and other sensitive data stored on the system.

Affected Products

• File Away plugin for WordPress versions up to and including 3.9.9.0.1
• WordPress installations running vulnerable File Away plugin versions

Discovery Timeline

• 2025-03-20 - CVE-2025-2539 published to NVD
• 2025-08-11 - Last updated in NVD database

Technical Details for CVE-2025-2539

Vulnerability Analysis

This vulnerability represents a combination of two security weaknesses working together to enable unauthorized file access. The primary issue is a missing capability check (authorization bypass) on the ajax() function within the File Away plugin. WordPress plugins should implement proper capability checks to ensure only authorized users can execute sensitive functions. Without this check, the function becomes accessible to unauthenticated users.

The secondary weakness involves the use of a weak, reversible encryption algorithm (CWE-327). The plugin employs cryptographic methods that can be easily reversed, allowing attackers to craft valid requests that bypass any encryption-based protections the plugin may have implemented.

When combined, these vulnerabilities create an attack chain where an unauthenticated attacker can:

1. Access the vulnerable ajax() function without authentication
2. Exploit the weak encryption to craft malicious requests
3. Read arbitrary files from the server filesystem

Root Cause

The root cause is twofold: a missing authorization check on the ajax() function and the implementation of a weak, reversible cryptographic algorithm in the class.fileaway_encrypted.php file. The plugin fails to verify that the requesting user has appropriate WordPress capabilities before processing file access requests, and the encryption used to protect file path parameters can be trivially reversed by attackers.

Attack Vector

The attack is network-based and requires no authentication or user interaction. An attacker can remotely send crafted HTTP requests to the WordPress site targeting the vulnerable AJAX endpoint. By reverse-engineering the weak encryption scheme used by the plugin, attackers can construct requests that specify arbitrary file paths on the server.

The vulnerability is particularly dangerous because it could be used to access:

• WordPress wp-config.php containing database credentials
• Server configuration files
• Other application configuration files
• Sensitive user data stored on the filesystem

For technical implementation details, refer to the WordPress Plugin File Away Encrypted Class and the Wordfence Vulnerability Analysis.

Detection Methods for CVE-2025-2539

Indicators of Compromise

• Unusual AJAX requests to File Away plugin endpoints from unauthenticated sessions
• Access log entries showing requests to /wp-admin/admin-ajax.php with File Away action parameters from unknown IPs
• Evidence of file access attempts targeting sensitive configuration files like wp-config.php
• Increased frequency of AJAX requests from single IP addresses targeting plugin endpoints

Detection Strategies

• Monitor WordPress access logs for suspicious AJAX requests containing File Away plugin actions
• Implement Web Application Firewall (WAF) rules to detect and block path traversal patterns in requests
• Review server file access logs for unauthorized reads of sensitive configuration files
• Deploy endpoint detection solutions to identify anomalous file read operations on WordPress servers

Monitoring Recommendations

• Enable detailed logging for WordPress AJAX endpoints and review logs regularly
• Configure alerts for multiple failed or suspicious requests to plugin endpoints
• Monitor for signs of data exfiltration following potential exploitation
• Implement file integrity monitoring on critical WordPress configuration files

How to Mitigate CVE-2025-2539

Immediate Actions Required

• Update the File Away plugin to a patched version immediately when available
• If no patch is available, deactivate and remove the File Away plugin from WordPress installations
• Review server logs for signs of prior exploitation attempts
• Rotate database credentials and other secrets if exposure is suspected
• Implement a WAF rule to block requests to the vulnerable AJAX endpoint

Patch Information

Check the WordPress File Away Developer Page for the latest version information and security updates. Organizations should monitor for plugin updates that address this vulnerability and apply patches as soon as they become available.

Workarounds

• Disable the File Away plugin until a security patch is released
• Implement server-level access controls to restrict access to the WordPress AJAX endpoint
• Use a Web Application Firewall to filter malicious requests targeting the vulnerable function
• Restrict server filesystem permissions to limit the impact of arbitrary file read attacks

# Disable File Away plugin via WP-CLI
wp plugin deactivate file-away

# Alternatively, rename the plugin directory to disable it
mv wp-content/plugins/file-away wp-content/plugins/file-away.disabled