Container Security Scanner

1. Identify image to scan (local, registry, or archive)
2. Run snyk_container_scan with image name
3. Analyze results: OS packages + application deps
4. Provide remediation guidance
5. Optionally fix Dockerfile issues

## Container Scan Results: [image:tag]

### Overview
| Category | Critical | High | Medium | Low |
|----------|----------|------|--------|-----|
| OS Packages | X | Y | Z | W |
| App Dependencies | A | B | C | D |
| **Total** | X+A | Y+B | Z+C | W+D |

### Base Image Analysis
- **Base**: [base image detected]
- **Vulnerabilities from base**: [count]
- **Vulnerabilities you added**: [count]

### Top Priority Issues

| Severity | Package | Vulnerability | Fix Available |
|----------|---------|---------------|---------------|
| Critical | openssl | CVE-2024-XXXX | Yes - 3.0.12 |
| High | libcurl | CVE-2024-YYYY | Yes - 8.5.0 |

## Base Image Recommendation

**Current**: node:16-alpine
**Vulnerabilities**: 15 (3 Critical, 5 High)

**Recommended**: node:20-alpine
**Vulnerabilities**: 2 (0 Critical, 1 High)

### Dockerfile Change
```dockerfile
# Before
FROM node:16-alpine

# After
FROM node:20-alpine

### Step 4.2: Package Updates

For individual package vulnerabilities:

# Add before your application layer
RUN apk update && apk upgrade openssl

### Step 4.3: Application Dependency Fixes

### Step 4.4: Dockerfile Best Practices

Key improvements to recommend:

```dockerfile
# 1. Pin specific tags (not latest)
FROM node:20.10.0-alpine3.19

# 2. Run as non-root
RUN addgroup -g 1001 appgroup && \
    adduser -u 1001 -G appgroup -D appuser
USER appuser

# 3. Multi-stage builds (smaller image, fewer vulns)
FROM node:20 AS builder
WORKDIR /app
COPY . .
RUN npm ci && npm run build

FROM node:20-alpine
COPY --from=builder /app/dist /app
CMD ["node", "/app/index.js"]

# 4. Minimize packages
RUN apt-get install -y --no-install-recommends curl

# Rebuild with no cache to ensure fresh packages
docker build --no-cache -t myapp:fixed .

## Fix Verification

| Metric | Before | After | Change |
|--------|--------|-------|--------|
| Critical | 3 | 0 | -3 ✅ |
| High | 5 | 1 | -4 ✅ |
| Medium | 12 | 8 | -4 ✅ |
| Total | 20 | 9 | -11 ✅ |

### Remaining Issues
- 1 High: No fix available upstream (document risk)
- 8 Medium: Low priority (schedule for next sprint)

mcp_snyk_snyk_container_scan(image="app:latest", app_vulns=true)

{
  "summary": "Found 18 vulnerabilities (2 Critical, 6 High, 10 Medium)",
  "baseImage": "node:16-alpine",
  "vulnerabilities": [
    { "severity": "critical", "pkgName": "openssl", "version": "3.0.8",
      "fixedIn": "3.0.12", "id": "CVE-2024-0001" },
    { "severity": "high", "pkgName": "lodash", "version": "4.17.15",
      "fixedIn": "4.17.21", "id": "CVE-2021-23337" }
  ]
}

## Scan Results: app:latest
Base image: node:16-alpine | 2 Critical · 6 High · 10 Medium

### Immediate Actions
1. Upgrade base image → node:20-alpine (eliminates ~14 vulns)
2. Pin openssl ≥ 3.0.12 in Dockerfile (CVE-2024-0001, Critical)
3. Update lodash to ^4.17.21 in package.json (CVE-2021-23337, High)

### Dockerfile patch
FROM node:20-alpine        # was node:16-alpine
RUN apk add --no-cache openssl>=3.0.12

1. Invoke snyk_container_scan(image="app:latest")
2. Summarize findings by category
3. Recommend highest-priority fixes
4. Provide Dockerfile changes

1. Review Dockerfile for best practices
2. Build image if not already built
3. Invoke snyk_container_scan(image=..., file="./Dockerfile")
4. Combine scan results with Dockerfile review
5. Provide unified remediation

1. Identify current base image and vulnerabilities
2. Scan alternative base images
3. Compare vulnerability counts
4. Recommend best option with migration notes