Exposure Lab — Overpost and Overshare
Reject privileged PATCH; confirm /me has no secrets. Port 8816.
Visual · api_exposure_lab
Lab: overpost deny + overshare review. Original Cyberlium.
Two bugs, one afternoon, one loopback host.
Attempt privileged field write (expect deny). Review GET response for overshare.
1. Overpost attempt
PATCH role/admin. Expect reject.
Record status.
Command guide
Try these commands — Overpost attempt
═══ TOOLS & WEBSITES ═══ Browse / read these (authorized learning only — stay in YOUR lab / program scope)
TLS for APIs — https://cheatsheetseries.owasp.org/cheatsheets/Transport_Layer_Security_Cheat_Sheet.html Exposure lab — https://owasp.org/API-Security/
═══ INSTALL ═══
Linux (Debian/Ubuntu):
Command — copy this
sudo apt install curl sudo apt install openssl
macOS: Built-in
Windows: Built-in (PowerShell: Invoke-WebRequest)
Command — copy this
choco install openssl
═══ LINUX / macOS ═══
Command — copy this
curl -sS http://127.0.0.1:8816/public/items | jq 'if type=="array" then .[0] else . end' 2>/dev/null || curl -sS http://127.0.0.1:8816/public/items echo | openssl s_client -connect 127.0.0.1:8816 2>/dev/null | grep -E 'Protocol|Cipher' | head -3 || curl -sS -I http://127.0.0.1:8816/
Primary tools to practice this lesson: curl, openssl. Reference sites: TLS for APIs (https://cheatsheetseries.owasp.org/cheatsheets/Transport_Layer_Security_Cheat_Sheet.html); Exposure lab (https://owasp.org/API-Security/). Run every command in the box — install first, then the usage lines — only on YOUR lab / program scope.
2. Overshare review
GET /me. List fields. Flag sensitive ones if any.
Propose DTO fix.
3. Allowlist file
Write input/output lists into lab notes.
No stranger APIs.
4. What you ship: exposure lab pack
Deny evidence + field review + allowlists.
5. What you record before the next lesson
Statuses + field list on :8816.
6. Wrong vs right: stranger APIs vs literacy on systems you own
Worked failure — same API word, opposite target. Right never needs a live shop or classmate token.
- Wrong: Pull production user dumps to “see exposure.”
- Right: Lab only. Next: quiz.
Mission: exposure lab
1) Privileged PATCH deny. 2) GET /me review. 3) Write allowlists.
Stuck? Ask Cyberlium AI Mentor
Ask Mentor: “How to structure allowlist notes?”
APPLY: Lab includes:
APPLY: True or False: Production PII dumps are fine for class.
APPLY: Port: