Security audit

Sysadmin

Security checks for vulnerabilities and agentic risk

Overview

This is a plain Markdown sysadmin reference skill with expected Linux administration advice and no executable payload or hidden behavior.

Install only if you want the agent to provide sysadmin guidance. Treat suggested commands as potentially system-impacting and ask the agent to explain and scope any change before running it on a real server.

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
Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code

Findings (3)

Credential Access

High

Category: Privilege Escalation
Confidence: 90% confidence
Finding: Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.
Content: Scanner excerpt · SKILL.md (reported line 13)May include surrounding context.
md
- Create service accounts with `--system` flag — no home directory, no login shell - `sudo` with specific commands, not blanket ALL — principle of least privilege - Lock accounts instead of deleting: `usermod -L` — preserves audit trail and file ownership - SSH keys in `~/.ssh/authorized_keys` with restrictive permissions — 600 for file, 700 for directory - `visudo` to edit sudoers — catches syntax errors before saving, prevents lockout ## Process Management

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 38)May include surrounding context.
md
- Monitor inode usage, not just disk space — many small files exhaust inodes ## Permissions and Security - `chmod 600` for secrets, `640` for configs, `644` for public — world-writable is almost never correct - Sticky bit on shared directories (`chmod +t`) — users can only delete their own files - `setfacl` for complex permissions — when traditional owner/group/other isn't enough - `chattr +i` makes files immutable — even root can't modify without removing flag

Unsafe Defaults

Medium

Category: Tool Misuse
Confidence: 70% confidence
Finding: Tool defaults are unsafe or overly permissive (e.g. disabled TLS verification, no authentication, world-writable permissions). Unsafe defaults widen the attack surface.
Content: Scanner excerpt · SKILL.md (reported line 38)May include surrounding context.
md
- Monitor inode usage, not just disk space — many small files exhaust inodes ## Permissions and Security - `chmod 600` for secrets, `640` for configs, `644` for public — world-writable is almost never correct - Sticky bit on shared directories (`chmod +t`) — users can only delete their own files - `setfacl` for complex permissions — when traditional owner/group/other isn't enough - `chattr +i` makes files immutable — even root can't modify without removing flag

Static analysis

No suspicious patterns detected.