DQIII8: Skill for Claude Code

/blue-team — Defensive Security Hardening

Read the latest red-team report and systematically fix every finding.

Usage

/blue-team                          # Fix all findings from latest report
/blue-team $ARGUMENTS               # Fix specific finding (e.g. RT-001)

Pipeline

Step 1: Load latest red-team report

ls -t tasks/audit/red-team-*.md | head -1

Read and parse all findings.

Step 2: Prioritize fixes

Order: CRITICAL → HIGH → MEDIUM → LOW

Within same severity: kill chain findings first (they have multiplied impact).

Step 3: For each finding, apply fix pattern

Finding type	Fix pattern
SQL injection	Replace f-strings with parameterized queries (?)
Command injection	Use shlex.quote() on user input, whitelist commands
Path traversal	Use pathlib.resolve() + check prefix matches allowed dir
XSS	Escape HTML output with html.escape() or template engine
Auth bypass	Add auth decorator/middleware to unprotected routes
Hardcoded secrets	Move to .env, use os.environ.get()
Debug exposure	Remove print(error), use logging with appropriate level
File permissions	chmod 600 on .env, .db, .pem, .key files
Missing validation	Add type checks, range checks, sanitization
Dependency vuln	pip install --upgrade {package}
Vibe-coding pattern	Rewrite the specific pattern with secure alternative

Step 4: Verify each fix

After applying a fix:

1. Run the original proof-of-concept from the red-team report
2. It should now FAIL (vulnerability patched)
3. Run tests to ensure the fix didn't break functionality
4. Document: "Finding RT-XXX: PATCHED, verified, tests pass"

python3 -m pytest tests/ -q

Step 5: Generate blue-team report

Generate: tasks/audit/blue-team-{date}.md

# Blue Team Report — {date}
Source: {red-team report filename}

## Fixes Applied
| ID | Finding | Severity | Fix | Verified | Tests |
|----|---------|----------|-----|----------|-------|
| RT-001 | SQL injection in db.py | CRITICAL | Parameterized queries | ✅ | ✅ |
| RT-002 | .env readable | HIGH | chmod 600 | ✅ | N/A |

## Kill Chains Broken
### Kill Chain 1: {name}
- Step broken at: {step N}
- Fix applied: {description}
- Chain now terminates at: {safe state}

## Remaining Risks
{Any findings that could not be fully fixed, with justification}

## Security Score
Before: {red-team score}/100
After: {blue-team score}/100
Improvement: +{delta} points