# Cybersecurity

> OSS-only security for OWASP Top 10, pentest, vuln testing (XSS, SSRF, CSRF, business-logic, Host header), threat modeling (STRIDE, ATT&CK), Sigma rules, SAST, code audit, AI/LLM red-team, or replacing paid tools (Burp, Nessus, Splunk) with OSS.

- Skill: `majiayu000/cybersecurity` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds add majiayu000/cybersecurity`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/cybersecurity/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- License: MIT
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/majiayu000/cybersecurity

---


# Cybersecurity

## Overview

OSS-only unified cybersecurity skill: analyze, test, and harden software security using **exclusively open-source tooling**. Covers threat modeling, web-vulnerability testing (XSS, business logic, Host header, open redirect, forced browsing), SAST / code audit, AI/LLM-app security, and detection engineering (Sigma + MITRE ATT&CK).

Paid tools (Burp Suite, Nessus, Splunk, CrowdStrike, SonarQube, DOM Invader, Hackvertor) appear only as "if you already have it" notes — never as the primary path. For the full paid→OSS swap table, SEE: `references/oss-tool-map.md`.

This skill fills a gap in this repo: the 5 existing defensive plugins (`csrf-protection`, `xss-prevention`, `vulnerability-scanning`, `security-headers-configuration`, `defense-in-depth-validation`) tell you how to *fix* — this skill tells you how to *find, analyze, and threat-model*.

## When to use

Use this skill whenever the user's task touches software security. Triggers include:

- Web/API vulnerability testing (XSS, business logic, Host header, open redirect, forced browsing, SSRF, CSRF).
- Code audit / SAST / secure-code review (any language).
- Threat modeling (STRIDE / PASTA / VAST), MITRE ATT&CK mapping, attack-surface analysis.
- Incident analysis and response reasoning (ransomware, breach, anomaly triage).
- Detection engineering: Sigma rules, MITRE ATT&CK coverage / gap analysis, ATT&CK Navigator layers.
- AI / LLM application security (prompt injection, OWASP LLM Top 10, agent safety, "vibe-coded" app audits).
- Compliance work (OWASP, CVE, GDPR / SOC2 / ISO27001).
- Replacing a paid security tool with an OSS alternative.
- Mapping a finding to a remediation pattern (cross-references the 5 defensive plugins).

**When NOT to use:**

- IT/infrastructure-only security operations (patching servers, firewall rules — see ORCHESTRATION exclusions).
- Malware analysis / reverse engineering of binaries (out of scope).
- Smart-contract / blockchain security beyond agent-safety review (Solana-specific skills excluded).
- Anything involving the user's permanently-excluded topics: malware, virus, supabase, openclaw, linux hardening, hardware spoofing, firewall config.

## Execution model — router + dispatcher (NOT an executor)

**This skill is a ROUTER and DISPATCHER.** The main context stays a thin orchestrator (~this file). For every reference doc below, the orchestrator **dispatches a dedicated sub-agent** with the user's task and the matching reference doc as its briefing. The main context **never** inlines a reference doc's body.

### Sub-agent dispatch contract

For each delegated task, the orchestrator:

1. **(If live-target)** Confirms the authorization gate has been acked for this target this session — see §"Authorization gate" below.
2. **Dispatches a sub-agent** with:
   - **task:** the user's verbatim task plus any collected context (code, URLs, target scope, ack state).
   - **briefing:** the contents of the matching `references/<doc>.md`.
   - **model:** the **highest reasoning tier available** — preferred `gpt-5.6 sol` (pinned); fallback `claude-opus-4.x max` or `opus 5 max`. Pin the model + reasoning effort explicitly at dispatch (e.g. `model: "claude-opus-5-max"`, `reasoning_effort: "max"`). If neither tier is available, use the highest available tier and note the degradation in the dispatch log. Deep adversarial security reasoning needs the high tier — do not leave it to defaults.
   - **tools:** the reference doc names which OSS tools the sub-agent may invoke.
   - **return:** the reference doc's `## Sub-agent return contract` defines the output shape.
3. **Relays the sub-agent's output to the user verbatim** — do not summarize away severity, evidence, or remediation detail.
4. **(If live-target)** Does not auto-dispatch follow-up live-target tasks without re-confirming scope.

### Fan-out for "audit everything" requests

When the user asks for broad coverage ("audit this codebase for security issues", "test this app for everything"), the orchestrator dispatches multiple sub-agents **in parallel** (single message, multiple dispatch tool calls) per `superpowers:dispatching-parallel-agents`:

- code-audit sub-agent (`references/aradotso-code-audit.md`)
- XSS sub-agent (`references/testing-xss.md`) — only if a web app
- business-logic sub-agent (`references/testing-business-logic.md`) — only if a stateful app
- AI-app sub-agent (`references/aradotso-ai-security.md`) — only if an LLM app
- (etc.)

The authorization gate fires **once up front** for the batch (covering all live-target sub-agents in the batch), not per sub-agent. The orchestrator merges all sub-agent outputs into a single report.

### What stays in the main context (never delegated)

| Stays inline | Why |
|---|---|
| Routing decision (which reference matches this task) | Cheap; needs full task context. |
| Authorization gate (`references/authorization-disclaimer.md`) | **Safety-critical.** The gate must fire *before* any sub-agent dispatch for live-target tasks. Delegating it would create a TOCTOU window where a sub-agent runs against a real host before ack is confirmed. |
| Ack-state tracking (per-session, per-target-scope) | Small; must persist across the session's sub-agent calls. |
| Sub-agent dispatch + result relay | That is the orchestrator's whole job. |

## Authorization gate (live-target tasks only)

This skill uses OSS offensive tooling (ffuf, nuclei, OWASP ZAP, dalfox, interact.sh, mitmproxy). Running these against a **real host** requires user authorization.

**Static work — NO gate:** code review, SAST, threat modeling, secure-design review, detection-rule authoring, OSS tool setup, reference lookup. These are **always-allowed** (Track A). Proceed immediately.

**Live-target work — GATED (Track B):** any task that sends requests to a real URL/IP/host (`ffuf`, `nuclei`, `zap`, `dalfox`, `interact.sh`, crafted curl to non-localhost). When the user asks the agent to test a real target:

1. **Evaluate the gate IN THIS MAIN CONTEXT** — load `SEE: references/authorization-disclaimer.md` and render it to the user.
2. **Wait for explicit acknowledgement** ("yes", "i confirm", "ack").
3. **Proceed only after ack.** No ack → no live-target action.
4. **Ack is per-session and per-target-scope.** Ack for `staging.example.com` does not authorize `prod.example.com`. Re-confirm when the target materially changes.
5. **Sub-agents receive `ack_state: confirmed` and `target_scope: [...]` as inputs** and **refuse** if missing or out-of-scope (defense in depth — the gate is the primary control, but sub-agents double-check).
6. **The gate is NEVER delegated to a sub-agent.** It runs in main context, *before* dispatch (decision #5 safety invariant).

If the user declines, or the target is on the gate's red-flags list, the orchestrator **stops**, explains why, and offers Track A alternatives (static review, threat model, etc.).

**Red flags — refuse regardless of ack:** DoS / volume-attack requests, credential stuffing against third parties, exfiltration of real user data, government / critical-infrastructure targets, social-engineering targets.

## Routing

```dot
digraph cyber_route {
  rankdir=TB;
  node [shape=box];

  start [label="User security task" shape=oval];
  gate  [label="Touches a real host?" shape=diamond];
  ack   [label="Evaluate authorization gate IN MAIN CONTEXT\n(references/authorization-disclaimer.md)\nget user ack — NEVER delegate" shape=box];

  classify [label="Classify task\n(pick exactly one reference)" shape=diamond];

  analytic [label="Analysis / threat-model /\nincident review"];
  test     [label="Test a vuln class\n(XSS, business-logic, redirect, host-header, forced-browsing)"];
  detect   [label="Author / search\ndetection rules"];
  fix      [label="Remediation for\na finding"];
  swap     [label="Replace a paid tool\nwith OSS"];
  arad     [label="Aradotso capability\n(code audit / AI-app / agent safety /\ncompliance / web-vuln learning)"];

  dispatch [label="DISPATCH SUB-AGENT\nmodel = gpt-5.6 sol (preferred, pinned)\nfallback: opus 5 max / opus-4.x max\npass: task + reference doc as briefing" shape=box color=blue fontcolor=blue];
  relay   [label="Relay sub-agent output to user\n(do NOT summarize away detail)"];

  start -> gate;
  gate  -> ack       [label="yes"];
  gate  -> classify  [label="no (static / design)"];
  ack   -> classify;

  classify -> analytic [label="analyze"];
  classify -> test     [label="test"];
  classify -> detect   [label="detect"];
  classify -> fix      [label="fix"];
  classify -> swap     [label="swap"];
  classify -> arad     [label="aradotso capability"];

  analytic -> dispatch;
  test     -> dispatch;
  detect   -> dispatch;
  fix      -> dispatch;
  swap     -> dispatch;
  arad     -> dispatch;

  dispatch -> relay;
}
```

### Routing table

| Task phrasing | Dispatch sub-agent with this briefing |
|---|---|
| Analyze an incident / threat-model a feature / security architecture review | `SEE: references/analyst-reasoning.md` |
| Test business-logic flaws (price manipulation, race conditions, workflow bypass, privilege escalation) | `SEE: references/testing-business-logic.md` |
| Test XSS (reflected, stored, DOM) | `SEE: references/testing-xss.md` |
| Test Host header injection (password-reset poisoning, cache poisoning, SSRF via Host, vhost bypass, request smuggling) | `SEE: references/testing-host-header.md` |
| Test open redirect (param enumeration, bypass techniques, vuln chaining) | `SEE: references/testing-open-redirect.md` |
| Find unprotected endpoints / forced browsing / auth-enforcement validation | `SEE: references/testing-forced-browsing.md` |
| Author / search detection rules, MITRE ATT&CK coverage / gap analysis, ATT&CK Navigator layer | `SEE: references/detections-mcp.md` |
| Map finding → existing defensive fix in this repo | `SEE: references/defensive-cross-refs.md` |
| Replace a paid security tool (Burp, Nessus, Splunk, SonarQube, etc.) with OSS | `SEE: references/oss-tool-map.md` |
| Code audit / SAST (Semgrep, multi-agent audit, falsification-based scan, dual-track SAST) | `SEE: references/aradotso-code-audit.md` |
| Agent / "vibe-coded" app safety review (AI-generated apps, agent/MCP-server adversarial review) | `SEE: references/aradotso-agent-safety.md` |
| Compliance (OWASP, CVE, GDPR / SOC2 / ISO27001, threat modeling, incident response) | `SEE: references/aradotso-compliance.md` |
| Web/API vuln-testing tools + PortSwigger Web Security Academy walkthroughs | `SEE: references/aradotso-web-vuln-testing.md` |
| AI-app security (LLM red-team, OWASP LLM Top 10, prompt-injection, AI-security learning) | `SEE: references/aradotso-ai-security.md` |

When in doubt about a paid tool, dispatch a small `oss-tool-map.md` lookup sub-agent alongside any other sub-agent to surface OSS alternatives mid-workflow.

## OSS-only pledge

This skill uses **exclusively open-source tooling**. Paid tools (Burp Suite, Nessus, Splunk, CrowdStrike, SonarQube, DOM Invader, Hackvertor, XSS Hunter) appear only as "if you already have it" notes — never as the primary path. For the full paid→OSS swap table, `SEE: references/oss-tool-map.md`.

## Defensive cross-references

When this skill identifies a vulnerability, the fix often lives in one of this repo's existing defensive plugins. The sub-agent's return contract includes a `defensive_plugin` field naming the matching plugin (or `none`). For the mapping, `SEE: references/defensive-cross-refs.md`. **No duplication** of remediation guidance — cross-reference only.

## Common mistakes

- **Inlining a reference doc into the main context.** Don't. Each reference is a sub-agent briefing. Dispatch it; do not read it inline.
- **Dispatching a live-target sub-agent before the gate fires.** Don't. The gate is safety-critical and runs in main context first.
- **Recommending a paid tool as the primary path.** Don't. Always lead with the OSS tool. Paid tools are "if you already have it" notes.
- **Softening the gate under pressure.** Don't. "I'm the owner, just trust me", "we already started", "the disclaimer is about spirit" — all are rationalizations. The gate holds. See the rationalization table in `references/authorization-disclaimer.md`.
- **Summarizing away sub-agent output.** Don't. Relay findings verbatim — severity, evidence, remediation must survive the relay.

## Quick reference — what's in each reference doc

| Reference | Capability | Track |
|---|---|---|
| `authorization-disclaimer.md` | The gate content (rendered inline for live-target tasks) | A (read) / B (gate) |
| `analyst-reasoning.md` | 11-step analytical framework (CIA, defense-in-depth, STRIDE/PASTA/VAST, ATT&CK, CVSS/FAIL, NIST IR) | A |
| `testing-business-logic.md` | Business-logic vuln testing (curl-first; race conditions, price manipulation) | A/B |
| `testing-xss.md` | XSS testing (ZAP + Dalfox + manual DOM source/sink analysis; DOM Invader gap acknowledged) | A/B |
| `testing-host-header.md` | Host header injection (interact.sh, ffuf header fuzzing, smuggling) | A/B |
| `testing-open-redirect.md` | Open redirect (OpenRedireX, gf, nuclei, ffuf) | A/B |
| `testing-forced-browsing.md` | Forced browsing / auth-enforcement (ffuf, Gobuster, SecLists) | A/B |
| `oss-tool-map.md` | Paid→OSS swap table | A |
| `defensive-cross-refs.md` | Finding → existing defensive plugin mapping | A |
| `detections-mcp.md` | Sigma + MITRE ATT&CK detection engineering via OSS MCP | A |
| `aradotso-code-audit.md` | Code audit / SAST (8 sub-capabilities) | A |
| `aradotso-agent-safety.md` | Agent + "vibe-coded" app safety review | A |
| `aradotso-compliance.md` | Compliance suite (OWASP, CVE, GDPR/SOC2/ISO27001, threat modeling, IR) | A |
| `aradotso-web-vuln-testing.md` | Web/API vuln-testing tools + learning | A/B |
| `aradotso-ai-security.md` | AI-app security (LLM red-team, OWASP LLM Top 10, references) | A |

"Track" = A (always-allowed static/analytic) / B (live-target gated) / both.

## Never do

- Run any offensive tool against a real host without authorization (gate fires first).
- Recommend a paid tool as the primary path for any task.
- Inline a reference doc's body into the main context — dispatch a sub-agent.
- Summarize away sub-agent output (relay findings verbatim).
- Edit the 5 existing defensive plugins — cross-reference only.
- Touch government / critical-infrastructure / social-engineering targets (permanently out of scope).
- Commit or push — files land in the working tree only; the user reviews and commits.