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Security audit

Excel

Security checks for vulnerabilities and agentic risk

Overview

This Excel skill is mostly coherent, but it needs review because its setup instructions tell the agent to execute an unverified remote installer script.

Review the oo CLI installation path before installing. Prefer official installation documentation or a verified installer instead of letting an agent run curl|bash or irm|iex automatically, and require explicit approval before any Excel operation that overwrites, deletes, sorts, clears, or restructures workbook data.

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
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • 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
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
Findings (2)

External Script Fetching

High
Category
Supply Chain
Confidence
97% confidence
Finding

The skill instructs the agent to install software by piping a remotely fetched script directly into a shell (curl ... | bash). This creates a supply-chain and remote code execution risk: if the remote host, transport, installer, or distribution path is compromised, arbitrary code will execute on the user's machine with the agent's privileges.

Content

Scanner excerpt · SKILL.md (reported line 85)May include surrounding context.

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
97% confidence
Finding

The description says to use this skill for "ANY Excel request" and "Whenever a task involves Excel," which is extremely broad and lacks limiting conditions or negative examples. This can cause unintended invocation for routine mentions of Excel rather than clearly scoped skill usage.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.