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Security audit

Plain

Security checks for vulnerabilities and agentic risk

Overview

The skill's Plain integration is mostly coherent, but its fallback setup includes unverified remote installer commands that could execute changing code on the user's machine.

Review this skill before installing. It appears intended for legitimate Plain operations, but avoid letting an agent run the remote installer commands automatically; install the oo CLI through a verified, versioned method when possible, and confirm any customer upsert payload before execution.

A.I.G

Vulnerability Patterns
  • Remote Payload Retrieval and ExecutionFetches external code whose behavior can change after review
  • 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
  • Embedded Malicious CodeShips malicious scripts inside the skill and executes them locally
  • Unauthorized Access and Privilege EscalationObtains permissions beyond the task's legitimate needs
Findings (1)

T03 · Remote Payload Retrieval and Execution

Error
Location
SKILL.md:58
Finding

Unverified Remote Installer Downloaded and Executed Directly

Content
View full analysis
Remediation
View remediation

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
98% confidence
Finding

The skill instructs the agent to install software by piping a remotely fetched script directly into a shell (curl ... | bash). This is dangerous because it executes unverified code from the network without integrity checking, version pinning, or user review; if the host, transport, or distribution path is compromised, arbitrary code execution follows immediately.

Content

Scanner excerpt · SKILL.md (reported line 58)May include surrounding context.

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
95% confidence
Finding

This manifest description is a trigger/invocation cue in a markdown/manifest file, and it is extremely broad. It lacks scope boundaries or negative examples, so many ordinary tasks that merely mention Plain could unintentionally invoke the skill.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.