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Security audit

Precoro

Security checks for vulnerabilities and agentic risk

Overview

Precoro access is appropriately limited to reading, but automatic CLI setup can execute unverified software and introduce undisclosed changes to other agents.

Review and explicitly approve CLI setup before use, preferably installing a verified version yourself. Understand that Precoro access runs through OOMOL. Review or disable automatic skill synchronization using the publisher's [documented controls](https://github.com/oomol-lab/oo-cli/blob/main/docs/commands.md). The downloaded installers were unavailable for inspection, so their exact system changes remain uncertain.

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
98% confidence
Finding

The supplied command performs remote script execution rather than searching or reading Precoro data. Nothing in the chunk establishes that the Oomol CLI installer is a supporting dependency for Precoro access. The downloaded script's contents and any further effects are not available for assessment.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The curl-to-bash command immediately executes a mutable remote script without a pinned version or independent integrity verification. If the distribution endpoint or release pipeline is compromised, attacker-controlled code could run with the invoking user's permissions, exposing accessible files and credentials; HTTPS alone does not protect against a compromised publisher.

Content

Scanner excerpt · SKILL.md (reported line 62)May include surrounding context.

Fallback setup executes downloaded installer scripts without a warning about remote code execution or system changes.

Medium
Category
Output Handling
Confidence
95% confidence
Finding

A missing CLI triggers instructions to execute a downloaded shell or PowerShell installer without first obtaining explicit approval for local software installation. Although limited to first-time setup, this expands a read-only Precoro request into local code execution and possible persistent system changes.

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 83)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