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Security audit

Ubuntu Hardening

Security checks for vulnerabilities and agentic risk

Overview

This skill is a disclosed external API tool that generates Ubuntu hardening configuration files, with operational and privacy cautions but no evidence of hidden execution, persistence, or malicious behavior.

Before installing or using this skill, treat its outputs as administrator-facing drafts: review every generated file, test in staging, keep backups and rollback access, and be especially careful with SSH, firewall, kernel, and service changes. Avoid sending real user IDs or stable identifiers unless you are comfortable sharing them with the external API provider.

A.I.G

Vulnerability Patterns
  • Skill Instruction HijackingAlters the agent's session goals or safety constraints when the skill loads
  • Agent Memory PoisoningWrites attacker-controlled rules into memory that affect later sessions
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs

SkillSpector

Vulnerability Patterns
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (4)

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
92% confidence
Finding

The skill explicitly returns configuration files and shell scripts intended for privileged paths such as /etc/sysctl.d/, /etc/ssh/, and /root/, but it does not clearly warn users that applying them can disrupt authentication, networking, or service availability. In this context, omissions are safety-relevant because users may deploy generated hardening changes directly onto production Ubuntu systems and lock themselves out or cause outages.

Content

No source excerpt is available for this finding.

External Transmission

Medium
Category
Data Exfiltration
Confidence
50% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · SKILL.md (reported line 132)May include surrounding context.

md
# References

- Kong Route: https://api.mkkpro.com/hardening/ubuntu
- API Docs: https://api.mkkpro.com:8128/docs

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
91% confidence
Finding

The request schema accepts sessionId and optional userId alongside hardening options, but the API description does not explain why these identifiers are needed, how they are protected, or whether they are required for processing. This can lead to unnecessary transmission of potentially sensitive identifiers, increasing privacy and tracking risk if the skill is invoked by an agent without clear user awareness or data-minimization controls.

Content

No source excerpt is available for this finding.

Vague Triggers

Low
Category
Not specified by scanner
Confidence
80% confidence
Finding

This file is a manifest-style JSON file, so vague-trigger checks apply. The description "Generate Ubuntu Linux security hardening configuration files" states the capability but does not provide any trigger constraints, scope boundaries, or exclusion conditions, which can make invocation criteria overly broad in agent settings.

Content

No source excerpt is available for this finding.