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Security audit

Segment

Security checks for vulnerabilities and agentic risk

Overview

Segment changes require approval, but the helper software can execute unverified online code and install persistent instructions in other agent applications.

Review before installing. Use a separately reviewed CLI installation, understand that Segment payloads pass through OOMOL, and retain confirmation for every write. Disable startup skill synchronization before invoking oo if you do not want additional agent instructions installed; the publisher documents OO_SKILLS_SYNC_DISABLED=1 in its [command reference](https://github.com/oomol-lab/oo-cli/blob/main/docs/commands.md#environment-variables). The bundled file was fully inspected, but the remote installers and deployed services remain unverified.

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
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
Findings (3)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
99% confidence
Finding

The supplied command performs remote software installation rather than the declared Segment data operations. Nothing in the code establishes that this installation supports Segment functionality, so it is not justified as a supporting implementation detail. The downloaded script's contents and any further behavior cannot be determined from this chunk.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The setup instruction pipes a mutable remote script directly into Bash without verifying its integrity or authenticity beyond HTTPS; the PowerShell alternative has the same weakness. If the distribution endpoint or delivery pipeline is compromised, following this fallback could execute attacker-controlled code with the agent's local permissions, potentially exposing accessible files and credentials. Its restriction to a missing-CLI error reduces exposure but does not remove the risk.

Content

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

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