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Security audit

Jam

Security checks for vulnerabilities and agentic risk

Overview

The Jam export workflow is reasonable, but its setup can automatically execute unverified remote code and introduce broader changes to agent skills.

Review and preinstall a vetted CLI release before use, and review its automatic skill synchronization settings. Connect Jam with the minimum necessary permissions and consider that exported data passes through OOMOL. The bundled skill was fully inspected, but the external installer and installed runtime 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, not Jam data retrieval. Nothing in the provided chunk establishes that this installation supports the declared Jam functionality. The downloaded script's contents are unavailable, so its further effects cannot be determined.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The setup command downloads mutable remote content and immediately executes it with the agent process's local privileges, without verifying a pinned version, signature, or trusted digest. Compromise of the installation endpoint or its distribution infrastructure could therefore expose local files and credentials or alter the environment; the missing-CLI condition limits exposure but does not make execution safe.

Content

Scanner excerpt · SKILL.md (reported line 55)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 76)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