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Security audit

Gamma

Security checks for vulnerabilities and agentic risk

Overview

The Gamma workflow is coherent, but its setup directs execution of an unverified remote installer without a clear approval step.

Review the CLI installation separately before allowing setup. Prefer a pinned, verified release, and review or disable its automatic bundled-skill synchronization before first use. Gamma requests pass through OOMOL; connect only the intended account and confirm generation payloads. The remote installer contents could not be inspected, so their exact local changes remain uncertain.

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
94% confidence
Finding

The supplied chunk performs remote installer execution rather than accessing Gamma data. Installing a dependency can be a supporting implementation detail, but this chunk provides no evidence connecting the Oomol installer to the declared Gamma functionality. The downloaded script's contents and subsequent behavior are not available for assessment.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping a mutable remote installer directly into bash executes its contents with the invoking user's privileges without review or independent integrity verification. Compromise of the distribution endpoint could therefore expose local files and credentials or enable persistence; the missing-CLI condition limits when this occurs, and HTTPS alone does not protect against a compromised publisher.

Content

Scanner excerpt · SKILL.md (reported line 62)May include surrounding context.

The setup instructions execute remotely downloaded installation scripts without warning about local code execution or system changes.

Medium
Category
Output Handling
Confidence
94% confidence
Finding

The fallback setup directs execution of remote shell and PowerShell scripts without explaining that they run local code or requiring explicit installation approval. Although installing a prerequisite is legitimate, it expands a Gamma operation into potentially consequential system changes; the declared oo-only tool allowance may limit execution but does not make these instructions safe.

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 83)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