SA-8(31)_secure-system-modification
- Repo stars 299
- Author updated Live
- Author repo CyberStrike
- Domain
- Security · nist · sp800-53 · rev5
- Compatible agents
-
- Claude Code
- Cursor
- Cline
- Codex
- Windsurf
- Gemini CLI
- +20
- Trust score
- 98 / 100 · audit passed
- Author / version / license
- @CyberStrikeus · v5.2.0 · no license declared
- Token usage
- Lean
- Setup complexity
- Plug-and-play
- External API key
- Not required
- Operating systems
- Unspecified (assume cross-platform)
- Runtime requirements
- No special requirements
- Permissions
-
- Read-only
- Write / modify
- Network behavior
- Local-only
- Install commands
- 26 variants
Profile is derived at build time from SKILL.md and install vectors. Subject to drift from author intent.
---
name: SA-8(31)_secure-system-modification
description: Implement the security design principle of secure system modification in [organization-defined].…
category: security
runtime: no special runtime
---
# SA-8(31)_secure-system-modification output preview
## PART A: Task fit
- Use case: Implement the security design principle of secure system modification in [organization-defined]. The principle of secure system modification states that system modification maintains system security with respect to the security requirements and risk tolerance of stakeholders. Upgrades or modifications to systems can transform secure systems into systems t….
- Inputs: target material, constraints, expected output, and acceptance criteria.
- Evidence boundary: follow “High-Level Description / What to Check / How to Test” and do not present inference as author intent.
## PART B: Execution result
- **01** The card summarizes the use case; runtime output centers on “Implement the security design principle of secure system modification in [organization-defined]. The principle of secure system modification states that system modification maintains system security with respect to the security requirements and risk tolerance of stakeholders. Upgrades or modifications to systems can transform secure systems into systems t…”.
- **02** When the source has headings, the agent prioritizes “High-Level Description / What to Check / How to Test” so the result follows the author’s structure.
- **03** Typical output includes task judgment, concrete steps, required commands or file edits, validation, and follow-up options.
- **04** Risk context follows the fingerprint: read files, write/modify files; mostly runs locally; usually needs no extra API key.
## Running Rules
- read files, write/modify files; mostly runs locally; usually needs no extra API key.
- Validate with a small sample before expanding scope.
- Return the result, validation criteria, and next iteration options.The source mentions slash commands such as `/etc`; use them first when your agent supports command triggers.
Name target files or source material, expected output, forbidden changes, and whether network or shell access is allowed. Permission fingerprint: read files, write/modify files.
Start with a small task and check whether the result follows “High-Level Description / What to Check / How to Test”. Inspect diffs, logs, previews, or tests before expanding scope.
Confirm the final output includes a concrete result, evidence, and next action. If it stays generic, tighten inputs, boundaries, and acceptance criteria.
---
name: SA-8(31)_secure-system-modification
description: Implement the security design principle of secure system modification in [organization-defined].…
category: security
source: CyberStrikeus/CyberStrike
---
# SA-8(31)_secure-system-modification
## When to use
- Implement the security design principle of secure system modification in [organization-defined]. The principle of secu…
- Use it when the task has clear inputs, repeatable steps, and validation criteria.
## What to provide
- Target material, scope, expected result, and forbidden changes.
- Whether network, commands, file writes, or external services are allowed.
## Execution rules
- Organize steps around “High-Level Description / What to Check / How to Test” and keep inference separate from source facts.
- read files, write/modify files; mostly runs locally; usually needs no extra API key.
- Validate with a small sample before expanding the task.
## Output requirements
- Return the deliverable, key evidence, validation method, and next action.
- Mark missing information as unknown; do not invent commands, platforms, or dependencies.The author source anchors workflow facts; repository files anchor sources and commands; Fluxly only adds fit, limitations, and quality judgment.
skill "SA-8(31)_secure-system-modification" {
input -> user goal + target files + boundaries + acceptance criteria
context -> High-Level Description / What to Check / How to Test
rules -> SKILL.md triggers / order / output contract
runtime -> no special runtime | read files, write/modify files | mostly runs locally
guardrails -> usually needs no extra API key + small-sample validation + diff/log review
output -> copyable result + checklist + next iteration
}SA-8(31) Secure System Modification
Enhancement of: SA-8
High-Level Description
Family: System and Services Acquisition (SA) Framework: NIST SP 800-53 Rev 5
The principle of secure system modification states that system modification maintains system security with respect to the security requirements and risk tolerance of stakeholders. Upgrades or modifications to systems can transform secure systems into systems that are not secure. The procedures for system modification ensure that if the system is to maintain its trustworthiness, the same rigor that was applied to its initial development is applied to any system changes. Because modifications can affect the ability of the system to maintain its secure state, a careful security analysis of the modification is needed prior to its implementation and deployment. This principle parallels the principle of secure evolvability.
What to Check
- Verify SA-8(31) Secure System Modification is documented in SSP
- Confirm control is operating effectively
- Review evidence of continuous monitoring for SA-8(31)
- Verify enhancement builds upon base control SA-8
How to Test
Step 1: Review Documentation
Examine the System Security Plan (SSP) and related artifacts for SA-8(31) implementation details. Verify the organization has documented how this control is satisfied.
Step 2: Validate Implementation
# For cloud environments, use cloud-audit-mcp tools
# For on-premises, review system configurations directly
# Example: Check if account management policies exist
grep -r "account.management\|access.control" /etc/security/ 2>/dev/nullStep 3: Test Operating Effectiveness
Verify the control is actively functioning, not just documented. Check logs, configurations, and operational evidence.
Tools
| Tool | Purpose | Usage |
|---|---|---|
| Manual Review | Documentation and interview-based | N/A |
Remediation Guide
Control Statement
Implement the security design principle of secure system modification in [organization-defined].
Implementation Guidance
The principle of secure system modification states that system modification maintains system security with respect to the security requirements and risk tolerance of stakeholders. Upgrades or modifications to systems can transform secure systems into systems that are not secure. The procedures for system modification ensure that if the system is to maintain its trustworthiness, the same rigor that was applied to its initial development is applied to any system changes. Because modifications can affect the ability of the system to maintain its secure state, a careful security analysis of the modification is needed prior to its implementation and deployment. This principle parallels the principle of secure evolvability.
Risk Assessment
| Finding | Severity | Impact |
|---|---|---|
| SA-8(31) Secure System Modification not implemented | Medium | System and Services Acquisition |
| SA-8(31) partially implemented | Low | Incomplete System and Services Acquisition |
CWE Categories
| CWE ID | Title |
|---|---|
| CWE-16 | Configuration |
References
- NIST SP 800-53 Rev 5 - SA-8(31)
- NIST SP 800-53A Rev 5 (Assessment Procedures)
- NIST SP 800-53 Rev 5 Full Catalog
Checklist
- Control documented in SSP
- Implementation evidence collected
- Operating effectiveness validated
- Continuous monitoring in place
- Related controls (CM-3, CM-4) reviewed
Decide Fit First
Design Intent
How To Use It
Boundaries And Review