New API Pentest

New API / One API Pentest Skill

When to use

Target is (or looks like) an AI API gateway — "Unified AI API gateway and admin dashboard", OpenAI-compatible /v1 endpoint, Cloudflare-fronted SPA. New API is a popular Go+React fork of One API. Often ships as a 3-part ecosystem sharing a brand:

• router.<domain> / api.<domain> — the gateway + admin (New API)
• topup.<domain> / store.<domain> — Node/Express storefront backed by Midtrans payments
• chat.<domain> — LibreChat web GUI

Workflow

1. Fingerprint & bundle mining

# headers / tech
curl -s -i https://TARGET/ | head -40
# find JS bundles in HTML
curl -s https://TARGET/ | grep -oE '/static/js/[a-zA-Z0-9._-]+\.js' | sort -u
# download ALL bundles, mine routes
for j in /static/js/*.js; do curl -s "https://TARGET$j" -o "/tmp/$(basename $j)"; done
grep -ohE '"/api/[a-zA-Z0-9_/{}.-]+"' /tmp/*.js | sort -u

New API keeps routes in the main index.*.js bundle. Look for root_init, secret_view, register_enabled flags in /api/status.

2. Verify SPA path-fallback BEFORE flagging file disclosure (CRITICAL PITFALL)

Cloudflare-fronted SPAs return the identical index.html (content-type text/html, ~8KB) for EVERY unknown path — /.env, /config.json, /swagger, /debug, /.git/config, /metrics, /healthz, /version all "200". These are false positives. Only flag file disclosure if content-type is NOT text/html and body is the actual secret. Always check:

ct=$(curl -s -o /tmp/x -w "%{content_type}" "https://TARGET/$f"); echo "$ct / $(wc -c </tmp/x) bytes"

3. Access-control verification (the core test)

For every admin-looking route, fire it twice: as a regular authed user AND with no token.

• Regular user → expect 403 AUTH_INSUFFICIENT_PRIVILEGE
• No token → expect 401 AUTH_UNAUTHORIZED
• 404 Invalid URL means the route literally does not exist (New API has NO /api/admin/* — admin is permission-scoped on /api/channel, /api/option, etc.)

4. Privilege escalation / mass-assignment

PUT /api/user/self with {"role":100,"group":"admin","quota":999999999} — New API server-side ignores privileged fields; re-read self confirms role:1, group:regular unchanged. Do NOT report as exploitable if server ignores it.

5. API-key / "main key" extraction (usually impossible)

• GET /api/user/token returns a regenerating hashed/derived reference string (e.g. vAdmqHsTx33yGa+CgtmgWnQfPdxynA==), NOT a usable sk-... key. It fails as Bearer/Token/api_key on /v1/models ("Invalid token").
• New API never exposes raw API keys to clients. Upstream provider keys live masked in channels (secret_view:false for regular → 403 on /api/channel/).
• Obtaining a working admin token or upstream key from a regular account is not possible through the tested surface. Report as negative result, do not fabricate.

Known patched decoys (do NOT report as vulns)

Storefront (Midtrans) payment-flow tests

Endpoints (mine from /app.js of the storefront): GET /api/skus, POST /api/coupon/validate, GET /api/user-check?username=, POST /api/order, GET /api/order/:token, POST /api/order/:token/bind.

• Payment bypass: POST /api/order/:token/bind with {"transaction_status":"settlement",...} faked → order stays status:pending, bound:false. Server validates with Midtrans. SAFE.
• IDOR topup-to-victim: POST /api/order with subs sku + fake username → rejected "username tidak ditemukan". Server-side validation. SAFE.
• Price tampering: server computes amount_rp/fee_rp/quota from sku; client only sends sku. SAFE.
• Coupon brute: requires valid issuer code; common guesses (PROMO,DISKON,WELCOME) fail.

Chat GUI (LibreChat)

• /api/config discloses config (registrationEnabled, login methods, build commit) — Low.
• /api/auth/register exists; requires email verification + is rate-limited ("Too many accounts created...").
• File endpoints (/api/files, /api/messages, /api/conversations) → 401 unauth. Path traversal → SPA fallback HTML, not real file.

Reporting

• Always state negative results explicitly ("all admin vectors blocked with correct 403/401"). Do NOT imply success where none occurred.
• Non-destructive only: no real payments, no destructive data changes, delete test accounts/orders on request.
• Reference: references/new_api_endpoint_map.md for the full route inventory + storefront test recipes used in a real assessment.

General API-pentest rules (apply beyond New API)

• SPA path-fallback false positives: Cloudflare SPAs return the identical index.html (text/html, ~8 KB) for EVERY unknown path. /.env, /config.json, /debug, /.git/config, /metrics "200" are the SPA shell, NOT files. Check content-type before flagging disclosure.
• Route non-existence vs authz: 404 "Invalid URL" = route absent; 401 = exists, needs token; 403 = exists, lacks permission.
• Honest negative results: when the operator pushes to "jebol / get the main key", and controls hold, report the evidence matrix. Never fabricate a breach. A target with no critical/high findings is a valid, valuable outcome.

Safety

• Cloudflare-fronted (often SIN edge): keep probing low-rate and sequential to avoid WAF blocks.
• Honor "no destructive verification" — read-only PoC, bikin akun test lalu hapus.