SA-8(31)_secure-system-modification

Security Community v5.2.0

Repo stars 299
Author repo CyberStrike

Interpretation is structured for decision-making; original keeps the upstream SKILL.md unchanged.

Decide Fit First

Core job: Implement the security design principle of secure system modification in [organization-defined]. The principle of secure system…
Best fit: Use it when the task has reusable inputs, steps, and validation criteria rather than a one-off answer.
Avoid forcing it: If the source lacks commands, platform support, or external-service evidence, keep those fields unknown instead of guessing.

Design Intent

Structure: The skill is organized around “High-Level Description”, “What to Check”, “How to Test”, “Step 1: Review Documentation”, showing how the author expects the agent to judge fit, collect context, and produce verifiable output.
Trigger evidence: Prioritize the author’s wording around when to use it, what context to collect, and what output shape to produce.
Evidence boundary: Author text states facts, repository files prove commands and paths, and Fluxly only adds fit, limits, and usage judgment.

How To Use It

Inputs: Provide target material, scope, expected result, forbidden changes, and validation method.
Invocation: Name SA-8(31)_secure-system-modification directly; if the source includes slash commands, start with the command and then add task context.
Validation: Start small and check whether the result follows “High-Level Description / What to Check / How to Test” before expanding.

Boundaries And Review

Dependencies: It usually needs no extra API key, so start with a small validation task.
Permissions: Declared permissions include read / write; ask the agent to state file, command, and rollback boundaries before acting.
Quality bar: A useful result names the deliverable, evidence, and next action. Generic prose means the task needs tighter context.

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/null

Step 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

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

Checklist

Control documented in SSP
Implementation evidence collected
Operating effectiveness validated
Continuous monitoring in place
Related controls (CM-3, CM-4) reviewed

Fluxly profile Author and license come from source; runtime, permissions, and network are Fluxly detections or estimates

Fluxly category: Security · nist · sp800-53 · rev5
Author-declared agents: No explicit declaration found; this is not inferred or tested compatibility
Static check: 98 / 100 · heuristic scan, not runtime safety proof
Author / version / license: @CyberStrikeus · v5.2.0 · no license declared
Fluxly token estimate: Lean
Fluxly setup estimate: Plug-and-play
External API key: No requirement detected
Detected OS requirements: Unspecified
Runtime requirements: Unspecified
Detected file/system behavior: Read-only
Write / modify
Detected network behavior: Local-only
Install commands: None (reference only)

Profile is derived at build time from SKILL.md and install vectors. Subject to drift from author intent.

Output preview sa-8-31-secure-system-modification.preview

The current SKILL.md does not define a fixed output example.

SKILL.md SKILL.md

# 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/null
```

### Step 3: Test Operating Effectiveness

…

Evidence boundary and execution chain

Author text anchors workflow facts; Fluxly only indexes current sections, terms, files, and commands.

sections -> High-Level Description → What to Check → How to Test → Step 1: Review Documentation → Step 2: Validate Implementation → Step 3: Test Operating Effectiveness
terms    -> Enhancement of · Family · Framework · Examine the System Security Plan (SSP) and related artifacts for SA-8(31) implementation details. · Verify the control is actively functioning, not just documented. · Implement the security design principle of secure system modification in [organization-defined].
files/cmd -> etc/security · dev/null · N/A · csrc.nist.gov/projects/cprt/catalog · cprt/framework/version/SP80053511/home · csrc.nist.gov/pubs/sp/800/53/a/r5/final · csrc.nist.gov/pubs/sp/800/53/r5/upd1/final
body sha256 -> 94b5d995971d