CVE-2025-50184: DbGate Path Traversal Vulnerability

CVE-2025-50184 Overview

CVE-2025-50184 is a directory traversal vulnerability in DbGate, a cross-platform database manager. The flaw affects versions 6.4.3-premium-beta.5 and below. The file parameter passed to the uploads listing endpoint is not properly restricted to the intended uploads directory. An authenticated attacker can supply a crafted path containing traversal sequences to read arbitrary files on the host system. The issue is tracked under [CWE-29: Path Traversal: '..\filename'] and was fixed in version 6.4.3-beta.8.

Critical Impact
Authenticated attackers can read arbitrary files outside the uploads directory, exposing system-level configuration, credentials, and sensitive application data.

Affected Products

DbGate versions 6.4.3-premium-beta.5 and earlier
DbGate premium beta releases prior to the fixed build
All platforms running vulnerable DbGate server components

Discovery Timeline

2025-07-26 - CVE-2025-50184 published to NVD
2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-50184

Vulnerability Analysis

The vulnerability resides in the uploads controller located at packages/api/src/controllers/uploads.js. The get handler passes the user-supplied req.query.file value directly into path.join(uploadsdir(), req.query.file) before serving the file with res.sendFile. Because the value is not sanitized, an attacker can prepend .. segments or absolute path separators to escape the uploads directory. The endpoint then resolves the path and returns the contents of any file the DbGate process can read.

Exploitation requires low-privilege authenticated access to the application. Successful exploitation discloses file contents without modifying integrity or availability, consistent with a confidentiality-focused information disclosure flaw.

Root Cause

The handler lacked any validation against directory traversal characters. Path normalization through path.join does not by itself restrict the resolved path to a parent directory, so sequences such as ../../etc/passwd collapse outside the uploads root. The missing input validation falls under [CWE-29].

Attack Vector

An attacker sends an HTTP GET request to the uploads endpoint with a manipulated file query parameter. By embedding .. traversal segments or forward/backslash separators, the attacker forces the server to resolve and return files such as configuration files, private keys, or system credentials accessible to the DbGate process.

javascript

// Source: https://github.com/dbgate/dbgate/commit/18b11df672b5a887bc17a6b9fdd13f9742c8f98e
// Security patch in packages/api/src/controllers/uploads.js
     raw: true,
   },
   get(req, res) {
+    if (req.query.file.includes('..') || req.query.file.includes('/') || req.query.file.includes('\\')) {
+      res.status(400).send('Invalid file path');
+      return;
+    }
     res.sendFile(path.join(uploadsdir(), req.query.file));
   },

The patch rejects any file value containing .., forward slashes, or backslashes before invoking sendFile, preventing the traversal entirely.

Detection Methods for CVE-2025-50184

Indicators of Compromise

HTTP requests to DbGate uploads endpoints containing .., %2e%2e, /, or \ characters in the file query parameter
Access log entries showing 200 responses for file= values that reference paths outside the configured uploads directory
Unexpected reads of sensitive files such as /etc/passwd, .env, or DbGate configuration files originating from the DbGate process
Outbound transfers from DbGate hosts shortly after suspicious uploads endpoint requests

Detection Strategies

Inspect web server and reverse proxy logs for traversal patterns in query strings targeting DbGate uploads routes
Deploy WAF rules that block .., encoded traversal sequences, and path separators in the file parameter
Correlate authentication events with anomalous file-read patterns from the DbGate service account
Compare the DbGate version banner against the fixed release 6.4.3-beta.8 to identify exposed instances

Monitoring Recommendations

Enable verbose access logging on DbGate and forward logs to a centralized analytics platform for retention and search
Alert on repeated 400 responses from the uploads endpoint, which may indicate probing after patch deployment
Monitor file integrity and access on directories adjacent to the uploads path, including configuration and secrets stores

How to Mitigate CVE-2025-50184

Immediate Actions Required

Upgrade DbGate to version 6.4.3-beta.8 or later, which contains the validation fix
Restrict network access to DbGate management interfaces to trusted administrators and internal networks only
Rotate any credentials, API keys, or secrets stored on hosts running vulnerable DbGate versions
Audit access logs for prior exploitation attempts using traversal payloads in the file parameter

Patch Information

The fix is published in the DbGate security advisory GHSA-2fp9-29gv-p5gm and applied in commit 18b11df. The patch adds explicit rejection of .., /, and \ characters in the file query parameter before the file is served. Operators should deploy the upgraded build and verify the version string after restart.

Workarounds

Place DbGate behind a reverse proxy that strips or rejects traversal sequences in query parameters targeting /uploads routes
Run DbGate under a low-privilege service account that cannot read sensitive system files outside its working directory
Apply filesystem-level access control lists to confine the DbGate process to its installation and data directories

bash

# Example NGINX rule to block traversal payloads to the uploads endpoint
location /uploads {
    if ($arg_file ~* "(\.\.|/|\\)") {
        return 400;
    }
    proxy_pass http://dbgate_backend;
}