CVE-2025-5544: Aaluoxiang OA System Path Traversal Flaw

CVE-2025-5544 Overview

CVE-2025-5544 is a path traversal vulnerability [CWE-22] in the aaluoxiang oa_system open-source office automation application. The flaw resides in the image function within src/main/java/cn/gson/oasys/controller/user/UserpanelController.java. Attackers with low-privileged authenticated access can manipulate file path parameters to read arbitrary files outside the intended directory. The exploit has been publicly disclosed, increasing the risk of opportunistic abuse against exposed installations. Because the project ships through continuous delivery with rolling releases, no fixed version identifier is published by the vendor.

Critical Impact

Remote authenticated attackers can traverse directories and read sensitive files from the server hosting oa_system, including configuration files, credentials, and source code.

Affected Products

• aaluoxiang oa_system (rolling release)
• Commits up to and including 5b445a6227b51cee287bd0c7c33ed94b801a82a5
• Deployments exposing the UserpanelController image endpoint

Discovery Timeline

• 2025-06-03 - CVE-2025-5544 published to NVD
• 2025-10-15 - Last updated in NVD database

Technical Details for CVE-2025-5544

Vulnerability Analysis

The vulnerability exists in the image method of the UserpanelController class, which serves user-related image content. The controller accepts a file path or filename parameter and uses it to construct a server-side file reference without sufficient normalization or canonicalization. Because the parameter is concatenated into a file path, an attacker can submit traversal sequences such as ../ to escape the intended image directory.

The attack is launched remotely over the network and requires only low-privilege authentication. No user interaction is needed. Successful exploitation results in limited confidentiality impact, allowing the attacker to retrieve files readable by the application's runtime user. The EPSS score is 0.567% with a percentile of 68.686.

Root Cause

The root cause is improper limitation of a pathname to a restricted directory [CWE-22]. The image handler passes user-controlled input into file system APIs without validating that the resolved path remains within the intended base directory. Java file APIs follow ../ segments during resolution, allowing the request to escape the image storage folder.

Attack Vector

An authenticated attacker issues an HTTP request to the vulnerable image endpoint and supplies a crafted filename parameter containing directory traversal sequences. The server resolves the supplied path relative to the image folder and returns the contents of the targeted file in the HTTP response. Sensitive targets include application configuration files holding database credentials, the application.properties file, and operating system files such as /etc/passwd on Linux hosts. Refer to the GitHub PoC Repository for disclosure details.

Detection Methods for CVE-2025-5544

Indicators of Compromise

• HTTP requests to the user panel image endpoint containing ../ or URL-encoded variants such as %2e%2e%2f in path or query parameters
• Application responses returning non-image MIME types or unexpectedly large payloads from the image endpoint
• Access log entries showing image requests resolving to files outside the configured image directory
• Authenticated sessions issuing repeated image requests with varying path parameters

Detection Strategies

• Inspect web access logs for traversal patterns targeting UserpanelController routes that serve images
• Deploy web application firewall rules that block traversal sequences in image-serving endpoints
• Monitor file access telemetry from the application process for reads outside the designated image directory
• Correlate authenticated user sessions with anomalous read activity on sensitive configuration files

Monitoring Recommendations

• Alert on application reads of files such as application.properties, /etc/passwd, or web.xml initiated by the oa_system Java process
• Track outbound responses from the image endpoint that exceed normal image content sizes or content-type expectations
• Review authentication logs for low-privilege accounts performing reconnaissance against image routes

How to Mitigate CVE-2025-5544

Immediate Actions Required

• Restrict network exposure of the oa_system application to trusted users and management networks
• Disable or proxy the affected user panel image endpoint until a patched build is deployed
• Audit authenticated user accounts and revoke unused or shared low-privilege credentials
• Rotate any secrets stored in files readable by the application process in case prior exfiltration occurred

Patch Information

The vendor distributes oa_system through continuous delivery with rolling releases. No fixed version identifier is published. Track the upstream repository for commits that update the image method in src/main/java/cn/gson/oasys/controller/user/UserpanelController.java to enforce path canonicalization. Until a verified fix is available, apply compensating controls described below. See the VulDB advisory for tracking updates.

Workarounds

• Place a reverse proxy or web application firewall in front of oa_system and block requests containing ../, ..\\, or encoded traversal sequences
• Run the application under a dedicated low-privileged operating system account with read access limited to required directories
• Apply mandatory access controls such as AppArmor or SELinux profiles that restrict the Java process to the application directory and image storage path
• Remove world-readable permissions on configuration files containing credentials

# Example nginx rule to block directory traversal in image requests
location ~* /userpanel/image {
    if ($args ~* "\.\./|%2e%2e%2f|%2e%2e/") {
        return 403;
    }
    proxy_pass http://oa_system_backend;
}