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Security audit

writing-rules

Security checks for vulnerabilities and agentic risk

Overview

This skill is a disclosed guide for creating local Hookify guardrail rules, with no hidden execution, exfiltration, or unrelated privilege use found.

Install only if you want persistent local Hookify rules that can warn or block future Claude Code actions. Review generated .claude/hookify.*.local.md files before relying on them, and keep broad blocking rules disabled or warning-only until tested.

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
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Tool MisuseTool Parameter Abuse, Chaining Abuse, Unsafe Defaults
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
Findings (5)

Credential Access

High
Category
Privilege Escalation
Confidence
60% confidence
Finding

Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.

Content

Scanner excerpt · SKILL.md (reported line 120)May include surrounding context.

pattern: API_KEY

🔐 API key in .env file! Ensure file is in .gitignore.

text

Tool Parameter Abuse

High
Category
Tool Misuse
Confidence
80% confidence
Finding

Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).

Content

Scanner excerpt · SKILL.md (reported line 157)May include surrounding context.

text
rm\s+-rf          → rm -rf
console\.log\(    → console.log(
chmod\s+777       → chmod 777

Test Patterns

Tool Parameter Abuse

High
Category
Tool Misuse
Confidence
85% confidence
Finding

Tool parameters are crafted to achieve unintended or unsafe behavior. Parameter abuse can bypass intended safety checks (e.g. shell=True, --force, dangerous glob patterns).

Content

Scanner excerpt · SKILL.md (reported line 241)May include surrounding context.

Delete:

bash
rm .claude/hookify.my-rule.local.md

List:

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
93% confidence
Finding

The trigger list includes very generic terms such as "rules," "patterns," "validation," and "safety," which overlap with common everyday requests and many unrelated development tasks. Although the document later explains when to use the skill, the manifest trigger section does not narrowly constrain activation scope or provide exclusions, increasing the chance of accidental invocation.

Content

No source excerpt is available for this finding.

Sudo/Root Execution

Medium
Category
Privilege Escalation
Confidence
80% confidence
Finding

Commands invoke sudo or root privileges. Verify this elevated access is necessary and justified.

Content

Scanner excerpt · SKILL.md (reported line 157)May include surrounding context.

text
rm\s+-rf          → rm -rf
console\.log\(    → console.log(
chmod\s+777       → chmod 777

Test Patterns

Static analysis

No suspicious patterns detected.