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Security audit

gstack Handoff

Security checks for vulnerabilities and agentic risk

Overview

This skill coherently creates a local handoff summary and discloses that it saves the file to the OS temporary directory, with privacy cautions but no evidence of malicious behavior.

Install this if you want agents to create handoff summaries. Before invoking it, avoid including secrets or highly sensitive conversation details, review the generated file path, and delete the temp file when it is no longer needed.

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
Vulnerability Patterns
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (2)

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
94% confidence
Finding

The trigger phrases are broad and context-light, so the skill may activate in situations where a user did not intend to persist or summarize sensitive conversation state. In a handoff skill, accidental invocation can cause over-collection of confidential context and create unnecessary artifacts that outlive the session.

Content

No source excerpt is available for this finding.

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
95% confidence
Finding

Writing a conversation-derived handoff to the OS temporary directory can expose sensitive project, credential-adjacent, or business data to other local users, backup/indexing tools, or later processes, especially if temp storage is shared or not promptly cleaned. Revealing the absolute path further increases discoverability of the artifact and may aid unintended access.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.