cve-impact（CVE 影响）

CVE Impact Analysis Skill

This skill helps SREs analyze CVE vulnerabilities to understand their impact on systems before creating remediation playbooks.

🚨 SYSTEM-LEVEL (CVEs on device X): Your first reply to the user MUST be the pagination prompt (Step -1). Do NOT call inventory__find_host_by_name or vulnerability__get_system_cves until the user responds. Do not validate MCP or resolve hostname first—HITL comes first.

Integration with Remediation Skill: The /remediation skill orchestrates this skill as part of its Step 1 (Impact Analysis) workflow for complex remediation scenarios. For simple standalone impact analysis, you can invoke this skill directly.

Invocation Note (Host-Specific)

When invoked by another skill (e.g. remediation), use the Skill tool—do NOT use "Task Output" with the skill name as task ID. That causes "No task found with ID: cve-impact". See skill-invocation.md.

Prerequisites

Required MCP Servers: lightspeed-mcp (setup guide)

Required MCP Tools:

• get_cves (from lightspeed-mcp) - List/query CVEs by severity
• get_cve (from lightspeed-mcp) - Get specific CVE details
• get_cve_systems (from lightspeed-mcp) - Find systems affected by CVEs
• get_system_cves (from lightspeed-mcp) - List CVEs affecting a specific system (uses system_uuid only)

Required Environment Variables:

• LIGHTSPEED_CLIENT_ID - Red Hat Lightspeed service account client ID
• LIGHTSPEED_CLIENT_SECRET - Red Hat Lightspeed service account secret

Prerequisite Validation

CRITICAL: Before executing any operations, execute the /mcp-lightspeed-validator skill to verify MCP server availability.

Validation freshness: Can skip if already validated in this session. See Validation Freshness Policy.

How to invoke: Execute the /mcp-lightspeed-validator skill

Handle validation result:

• If validation PASSED: Continue with CVE impact analysis
• If validation PARTIAL: Warn user and ask to proceed
• If validation FAILED: Stop execution, provide setup instructions

When to Use This Skill

Use this skill directly when you need:

• Standalone CVE impact analysis without remediation planning
• Quick risk assessment for a single CVE
• Understanding which systems are affected by a CVE
• CVE severity assessments for change management documentation
• Risk assessment reports for management

Use the /remediation skill when you need:

• CVE analysis followed by remediation playbook generation
• Complex workflows involving multiple CVEs and systems
• Integrated risk assessment + remediation planning + execution guidance
• Batch remediation across infrastructure
• End-to-end CVE management (analysis → validation → remediation → verification)

To invoke: Execute the /remediation skill

How they work together: The /remediation skill orchestrates this skill as part of its comprehensive workflow, combining impact analysis with context gathering, playbook generation, and execution guidance.

Workflow

Step -1: System-Level Gate — HITL FIRST (MANDATORY)

If the user asked for CVEs on a device (e.g. "CVEs on ip-172-31-32-201", "remediatable CVEs on hostname X", "most critical CVEs on system Y"):

Your first response to the user MUST be the pagination prompt below. Do not run Step 0, do not call inventory__find_host_by_name, do not call vulnerability__get_system_cves until the user responds.

Reply to the user with:

To fetch remediatable CVEs on this system, I will:
- Paginate through vulnerability__get_system_cves (limit=100 per page)
- Filter each page for advisory_available === true
- Systems often have 1,700+ CVEs (~18 API calls)

⚠️ First page only often returns 0 remediatable CVEs—they may be on any page. For "remediatable" queries, recommend "all pages".

Options:
- **First page only**: Fetch 100 CVEs, filter for remediatable (may be 0)
- **All pages**: Fetch until no more results (recommended for remediatable)
- **N pages**: Fetch up to N pages (e.g. "3 pages" = up to 300 CVEs scanned)

How would you like to proceed? (first page / all pages / N pages)

Wait for the user to respond. Only after they reply may you proceed to Step 0.

If account-level (e.g. "CVEs on my account"): Skip this step, go to Step 0.

Step 0: Validate Lightspeed MCP Prerequisites

Action: Execute the /mcp-lightspeed-validator skill

Note: Can skip if validation was performed earlier in this session and succeeded. See Validation Freshness Policy.

How to invoke: Execute the /mcp-lightspeed-validator skill

Handle validation result:

• If validation PASSED: Continue to Step 1
• If validation PARTIAL: Warn user and ask to proceed
• If validation FAILED: Stop execution, user must set up MCP server

Step 1: CVE Discovery — Choose Flow

Select the appropriate flow based on user request.

Variable mapping:

• devices: all → account flow; selected → system flow
• severities: all, most critical, or selected → parameter/filter in each flow
• remediation: available → remediatable flow; does not matter → all-cves flow

CRITICAL: System-Level — HITL FIRST (Before Any Other Action)

For system-level flows (02 or 03): Your first action MUST be to display the HITL prompt below and wait for user confirmation. Do NOT resolve hostname, do NOT call any MCP tool, until the user responds.

Order of operations:

1. STOP. Display HITL prompt. Wait for user.
2. Only after user confirms → document consultation → resolve hostname → call vulnerability__get_system_cves

*For remediatable CVEs on system (flow 03):*

To fetch remediatable CVEs on this system, I will:
- Paginate through vulnerability__get_system_cves (limit=100 per page)
- Filter each page for advisory_available === true
- Systems often have 1,700+ CVEs (~18 API calls)

⚠️ First page only often returns 0 remediatable CVEs—they may be on any page. For "remediatable" queries, recommend "all pages".

Options:
- **First page only**: Fetch 100 CVEs, filter for remediatable (may be 0)
- **All pages**: Fetch until no more results (recommended for remediatable)
- **N pages**: Fetch up to N pages (e.g. "3 pages" = up to 300 CVEs scanned)

How would you like to proceed? (first page / all pages / N pages)

*For all CVEs on system (flow 02):*

This system may have many CVEs. I will paginate through vulnerability__get_system_cves (limit=100 per page).

Options:
- **First page only**: Fetch 100 CVEs, then stop (quick overview)
- **All pages**: Fetch until no more results (systems with 1,700+ CVEs may require ~18 API calls)
- **N pages**: Fetch up to N pages (e.g. "3 pages" = 300 CVEs)

How would you like to proceed? (first page / all pages / N pages)

Handle response: Wait for user reply. Only after user confirms (and specifies strategy) may you proceed to resolve hostname and call vulnerability__get_system_cves. If user says "no" or cancels, stop execution.

Anti-pattern: Do NOT call vulnerability__get_system_cves or inventory__find_host_by_name before completing HITL. Calling with only the first page (limit=100, no offset loop) misses remediatable CVEs on later pages.

Action: Read and follow the selected flow file. For system-level, HITL is Step 1 (before all other steps).

Step 2: CVE Information Retrieval (For Specific CVE Analysis)

CRITICAL: Document consultation MUST happen BEFORE tool invocation.

Document Consultation (REQUIRED - Execute FIRST):

1. Action: Read cvss-scoring.md using the Read tool to understand CVSS score interpretation and severity mapping
2. Output to user: "I consulted cvss-scoring.md to understand CVSS score interpretation and severity mapping."

MCP Tool: get_cve or vulnerability__get_cve (from lightspeed-mcp)

Parameters:

• cve_id: Exact CVE identifier from user query (format: "CVE-YYYY-NNNNN")

- Example: "CVE-2024-1234"

• include_details: true (retrieve complete metadata including CVSS vector, affected packages, references)

Expected Output: Comprehensive CVE metadata including CVSS score, severity, attack vector, affected packages, remediation status

Retrieve comprehensive CVE metadata:

CVE ID: CVE-YYYY-NNNNN
CVSS Score: X.X (Base score from NIST)
Severity: Critical/High/Medium/Low
Attack Vector: Network/Adjacent/Local/Physical
Attack Complexity: Low/High
Privileges Required: None/Low/High
User Interaction: None/Required
Scope: Unchanged/Changed
Confidentiality Impact: None/Low/High
Integrity Impact: None/Low/High
Availability Impact: None/Low/High

Description: [CVE description from NVD/Red Hat]
Affected Packages: [List of packages and versions]
Published Date: YYYY-MM-DD
Last Modified: YYYY-MM-DD

Step 3: Affected Systems Identification

CRITICAL: Document consultation MUST happen BEFORE tool invocation.

Document Consultation (REQUIRED - Execute FIRST):

1. Action: Read insights-api.md using the Read tool to understand the system identification response format
2. Output to user: "I consulted insights-api.md to understand the system identification response format."

MCP Tool: get_cve_systems or vulnerability__get_cve_systems (from lightspeed-mcp)

Parameters:

• cve_id: Exact CVE identifier (format: "CVE-YYYY-NNNNN")

- Example: "CVE-2024-1234"

• include_patched: false (exclude already-patched systems to focus on vulnerable systems)

Expected Output: List of affected systems with UUID, hostname, IP address, package version, vulnerability status

Identify which systems in your infrastructure are affected by the CVE:

Affected Systems:
- system-uuid-1 (hostname: web-server-01, IP: 10.0.1.10)
  - Package: httpd-2.4.37-1.el8
  - Status: Vulnerable

- system-uuid-2 (hostname: web-server-02, IP: 10.0.1.11)
  - Package: httpd-2.4.37-1.el8
  - Status: Vulnerable

Total Affected Systems: N

Step 4: System Classification

CRITICAL: Document consultation MUST happen BEFORE classification logic.

Document Consultation (REQUIRED - Execute FIRST):

1. Action: Read fleet-management.md using the Read tool to understand system tagging and classification strategies
2. Output to user: "I consulted fleet-management.md to understand system tagging and classification strategies."

Classify affected systems by environment and criticality based on tags from Red Hat Lightspeed:

System Classification:
- Production systems: N (highest priority)
- Staging systems: M (test before prod)
- Development systems: K (lowest priority)
- Bare metal: X systems
- Virtual machines: Y systems

Step 5: Risk Assessment

CRITICAL: Document consultation MUST happen BEFORE risk assessment.

Document Consultation (REQUIRED - Execute FIRST):

1. Action: Read cvss-scoring.md using the Read tool to understand risk prioritization based on CVSS vectors
2. Output to user: "I consulted cvss-scoring.md to understand risk prioritization based on CVSS vectors."

Provide a risk assessment based on:

• CVSS score and severity
• Number of affected systems
• System criticality (production vs non-production)
• Attack vector and exploitability
• Known exploits in the wild

Output Format:

Risk Assessment Summary
━━━━━━━━━━━━━━━━━━━━━━━

Overall Risk Level: Critical/High/Medium/Low

Factors:
✓ CVSS Score: X.X (Severity: High)
✓ Affected Systems: N systems
✓ Environment: Production (Critical)
✓ Attack Vector: Network (Remote exploitable)
✓ Exploitability: Proof-of-concept exists
✓ User Interaction: None required

Recommendation: Immediate remediation recommended
Priority: P0 (within 24 hours) / P1 (within 7 days) / P2 (within 30 days)

Step 6: Impact Analysis

Analyze business impact (service, confidentiality/integrity/availability, compliance).

Step 7: Remediation Readiness Check

Check if automated playbook or manual steps are available.

Output and Examples

Read references/03-output-templates.md for report format. Read references/04-examples.md for query-type examples and remediation integration.

Error Handling

Read references/05-error-handling.md for CVE not found, no affected systems, and Lightspeed tool failures.

Reference Files

Parsing MCP Responses

REQUIRED: Use the skill's parser script for all vulnerability response parsing. Do NOT use jq, inline Python, or other ad-hoc JSON parsing.

Do NOT generate inline Python to aggregate multiple page files—the parser accepts multiple file paths and produces aggregated reports.

Read references/02-cve-parsing-guide.md for:

• Parser location: references/01-cve-response-parser.py
• Single page: python3 rh-sre/skills/cve-impact/references/01-cve-response-parser.py <response.json>
• Multiple pages: python3.../01-cve-response-parser.py page1.json page2.json page3.json... (merges, dedupes, aggregated report)
• Filter options: FILTER_REMEDIATABLE=1, FILTER_IMPACT=Critical,Important
• Report format: OUTPUT=report, SYSTEM_NAME=hostname for aggregated multi-page reports

Save each MCP tool result to a file, then run the parser with one or more paths. Use parser output for summary tables and reports.

Best Practices

1. Always start with risk assessment before deciding on remediation
2. Check for known exploits using CVE description and references
3. Consider business impact not just CVSS scores
4. Group related CVEs for batch remediation when possible
5. Document findings for compliance and audit purposes
6. Test in staging first for high-impact changes

Dependencies

Required MCP Servers

• lightspeed-mcp - Red Hat Lightspeed platform access

Required MCP Tools

• get_cves (from lightspeed-mcp) - List/query CVEs by severity and filters

- Parameters: severity (array), sort_by (string), limit (number) - Returns: List of CVEs with CVSS scores, severity, affected systems count

• get_cve (from lightspeed-mcp) - Get specific CVE details

- Parameters: cve_id (string, format CVE-YYYY-NNNNN), include_details (boolean) - Returns: Complete CVE metadata with CVSS vector, affected packages, references

• get_cve_systems (from lightspeed-mcp) - Find systems affected by CVE

- Parameters: cve_id (string), include_patched (boolean) - Returns: List of affected systems with UUID, hostname, package version, status

• get_system_cves (from lightspeed-mcp) - List CVEs affecting a specific system

- Parameters: system_uuid (string, required) - use system_uuid, NOT system_id - Does NOT support: impact, limit, severity filters - filter results client-side - Returns: List of CVEs affecting the system

Related Skills

• mcp-lightspeed-validator - PREREQUISITE - Validates Lightspeed MCP server before operations

- Use before: ALL cve-impact operations (Step 0 in workflow) - Purpose: Ensures MCP server is available before attempting tool calls

• cve-validation - Validate CVE IDs before impact analysis

- Use before: Step 2 if CVE format/existence is uncertain - Purpose: Confirms CVE is valid and remediable before expensive analysis

• system-context - Get detailed system configuration after identifying affected systems

- Use after: Step 3 when deeper system investigation is needed - Purpose: Understand deployment architecture for remediation planning

• fleet-inventory - Get comprehensive fleet information before CVE analysis

- Use before: Step 1 when starting from fleet discovery - Purpose: Understand overall infrastructure before assessing CVE impact

Reference Documentation

• cvss-scoring.md - CVSS score interpretation and severity mapping
• vulnerability-logic.md - CVE severity classification and filtering
• insights-api.md - System identification response format
• fleet-management.md - System tagging and classification strategies
• references/02-cve-parsing-guide.md - Parse MCP vulnerability responses; use the parser script instead of generating inline Python

Tools Reference

This skill primarily uses:

• get_cve (vulnerability toolset) - Get details about a specific CVE
• get_cve_systems (vulnerability toolset) - Get list of systems affected by a CVE
• get_cves (vulnerability toolset) - Get list of all CVEs affecting the account (optional)
• get_system_cves (vulnerability toolset) - Get list of CVEs affecting a specific system

- CRITICAL: Use system_uuid (required), NOT system_id - Does NOT support impact, limit, or severity filters - filter client-side

• inventory__find_host_by_name (inventory toolset) - Resolve hostname to system UUID before get_system_cves
• get_host_details (inventory toolset) - Get detailed system information (optional)

All tools are provided by the lightspeed-mcp MCP server configured in .mcp.json.