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Security audit

PartnerStack

Security checks for vulnerabilities and agentic risk

Overview

PartnerStack operations have clear approval controls, but the required CLI can also change other agents’ installed skills without this skill explaining those effects.

Review and install the CLI separately before enabling this skill. Limit its automatic cross-agent skill changes; the publisher documents OO_SKILLS_SYNC_DISABLED=1 for disabling startup synchronization. Understand that OOMOL mediates your PartnerStack access, and verify customer-creation payloads before approving them. The remote installers and hosted connector were not audited.

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 (5)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
99% confidence
Finding

The supplied command performs remote installer execution, not PartnerStack data operations. Nothing in the supplied chunk establishes this installer as a supporting dependency for the declared purpose. The downloaded script's contents are not provided, so its further behavior cannot be assessed.

Content

No source excerpt is available for this finding.

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
86% confidence
Finding

The supplied code's sole behavior is a CLI login, rather than PartnerStack data operations. Authentication could be a supporting implementation detail if the CLI were established as a PartnerStack integration, but the supplied content provides no such connection.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping the HTTPS response directly into Bash executes mutable remote content without checking its integrity or reviewing it. The domain is consistent with the declared CLI provider, but compromise of that provider or its distribution infrastructure could turn this legitimate setup step into local arbitrary-code execution.

Content

Scanner excerpt · SKILL.md (reported line 61)May include surrounding context.

The setup workflow executes downloaded installer scripts without warning the user about the system-integrity risk.

Medium
Category
Output Handling
Confidence
95% confidence
Finding

The setup instructions direct the agent to execute downloaded shell or PowerShell scripts without an explicit installation approval step or artifact verification. Although installation is conditional on a missing CLI and serves a legitimate dependency, a compromised installer could execute arbitrary code with the agent's local 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 82)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