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Security audit

Perigon

Security checks for vulnerabilities and agentic risk

Overview

The Perigon search workflow fits its purpose, but its automatic setup executes unverified downloaded code without a clear approval step.

Review setup before enabling this skill. Install a verified CLI version separately and require approval before running downloaded installers. Check the CLI's automatic skill synchronization and disable unwanted changes. Perigon queries and authorization use OOMOL and may incur charges. External installer and service implementations were not verified; no malicious behavior was established in the bundled file.

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
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
  • Excessive AgencyUnrestricted Tool Access, Autonomous Decision Making, Scope Creep
  • Output HandlingUnvalidated Output Injection, Cross-Context Output, Unbounded Output
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
Findings (4)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
95% confidence
Finding

The supplied code performs remote installer execution rather than the declared Perigon data operations. Although installation can be a supporting implementation detail, this chunk establishes no relationship between the Oomol installer and the declared functionality. The downloaded script's contents and resulting system changes cannot be determined from the supplied code.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping a mutable remote installer directly into bash executes its contents without inspection, version pinning, or independent integrity verification. HTTPS protects transport but does not prevent a compromised distribution endpoint from serving code that can access local files, credentials, or other resources available to the process; the PowerShell example presents the same underlying risk.

Content

Scanner excerpt · SKILL.md (reported line 66)May include surrounding context.

The setup workflow runs downloaded installation scripts without warning the user about executing remote code or modifying their system.

Medium
Category
Output Handling
Confidence
94% confidence
Finding

The fallback setup instructs the agent to execute downloaded shell or PowerShell code without first obtaining explicit approval for installing software and modifying the host. Triggering setup only when the CLI is missing reduces exposure, but a compromised installer could still execute arbitrary code with the agent process's privileges.

Content

No source excerpt is available for this finding.

Autonomous Decision Making

Medium
Category
Excessive Agency
Confidence
80% confidence
Finding

Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.

Content

Scanner excerpt · SKILL.md (reported line 87)May include surrounding context.

md
- **`OOMOL_INSUFFICIENT_CREDIT`** — OOMOL billing stop. Recharge at `https://console.oomol.com/billing/token-recharge` before retrying.

- **HTTP 402 without `OOMOL_INSUFFICIENT_CREDIT`** — the third-party account itself has no active plan or credit. Report the provider error message as is; do not ask the user to recharge OOMOL.

## Resources