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Security audit

Linear

Security checks for vulnerabilities and agentic risk

Overview

Linear changes require approval, but setup executes unverified downloaded code and does not disclose the CLI’s broader agent-skill installation behavior.

Review and approve CLI installation separately before allowing the setup fallback. Consider disabling its automatic skill synchronization; current documentation provides OO_SKILLS_SYNC_DISABLED=1 for this purpose. Only connect Linear data you authorize OOMOL to handle, and retain the skill’s approval requirements for changes. The remote installers and binaries were not verified. [CLI controls](https://github.com/oomol-lab/oo-cli/blob/main/docs/commands.md)

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 installs external software rather than performing any visible Linear operation. Nothing in the chunk establishes that this installer is a supporting dependency for the declared Linear functionality. The downloaded script is not provided, so its further behavior and any relationship to Linear cannot be verified.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
99% confidence
Finding

Piping a mutable HTTPS installer directly into Bash executes remotely supplied code without an opportunity to verify or review it. HTTPS protects transport but does not protect against a compromised publisher or installer host, which could use this execution path to access local files and credentials within the process's permissions; this overlaps with SQP-2 rather than representing a separate attack chain.

Content

Scanner excerpt · SKILL.md (reported line 88)May include surrounding context.

Fallback setup executes remotely downloaded installation scripts without a security warning or approval step.

Medium
Category
Output Handling
Confidence
97% confidence
Finding

The fallback instructs the agent to execute a downloaded installer through Bash or PowerShell without requiring explicit installation approval or verifying the downloaded artifact. A compromised installer endpoint or publisher could execute arbitrary code with the agent's local permissions; limiting setup to a missing-CLI error reduces frequency but does not eliminate this risk.

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 109)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