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Security audit

Parallel

Security checks for vulnerabilities and agentic risk

Overview

The Parallel integration is coherent, but its setup can make broader local changes than the skill explains or asks you to approve.

Review setup before installing. Use a separately reviewed CLI version and disable automatic skill synchronization unless you want additional agent skills installed. Confirm that sending task data through OOMOL is acceptable. Parallel writes have explicit approval safeguards, but the downloaded installers and live connector implementation were unavailable for verification.

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
97% confidence
Finding

The supplied command executes an installer from cli.oomol.com, with no visible connection to Parallel or its data operations. Although dependency installation can be a supporting implementation detail, this chunk provides no evidence that the Oomol installer supports the declared purpose. The downloaded script is not supplied, so its additional behavior cannot be determined.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping a remotely fetched script directly into Bash executes whatever the endpoint supplies with the invoking user's privileges, without a pinned version or independent integrity verification. Although this is a documented dependency installation rather than evidence of malicious intent, compromise of the distribution endpoint or release process could expose local files and credentials or enable persistent changes; the PowerShell alternative has the same underlying risk.

Content

Scanner excerpt · SKILL.md (reported line 59)May include surrounding context.

The setup workflow executes downloaded installation scripts without warning about local code execution and system changes.

Medium
Category
Output Handling
Confidence
95% confidence
Finding

The missing-CLI fallback directs the agent to execute remote installation scripts without explicitly requesting approval for local code execution or system changes. Limiting this to a setup failure reduces exposure, but a request to operate Parallel does not necessarily authorize installing software on the user's machine.

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 80)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