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Security audit

Persona

Security checks for vulnerabilities and agentic risk

Overview

Persona operations have clear approval controls, but setup can execute unverified installer code and introduce persistent changes to other agents’ skills.

Review and install a verified CLI release separately before use. Check its automatic skill installation behavior; the publisher documents OO_SKILLS_SYNC_DISABLED as a control for startup synchronization in its [command reference](https://github.com/oomol-lab/oo-cli/blob/main/docs/commands.md). Connect only the intended Persona account, understand that OOMOL processes the requests, and retain confirmation before changes. The bundled skill was fully inspected, but the remote installer payloads and deployed connector implementation 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
  • 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
99% confidence
Finding

The supplied command performs remote script execution associated with Oomol, rather than the declared Persona operations. Nothing in the supplied chunk establishes this installation as a supporting dependency for Persona. The downloaded script's contents and any further effects are not visible.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The curl-to-bash pipeline executes whatever script the remote endpoint currently serves, without pinning or verifying its contents. HTTPS protects transport but does not prevent malicious changes at a compromised publisher or distribution endpoint. The legitimate dependency-installation context explains the command but does not eliminate the potential for local code execution and access to sensitive files.

Content

Scanner excerpt · SKILL.md (reported line 58)May include surrounding context.

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

Medium
Category
Output Handling
Confidence
94% confidence
Finding

The fallback directs execution of downloaded shell or PowerShell code without review, integrity verification, or explicit installation approval. A compromised distribution endpoint could execute arbitrary code with the invoking user's permissions; limiting installation to a missing-CLI error reduces exposure but does not remove the risk. This overlaps with SC2 rather than representing an independent exploit path.

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 79)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