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Security audit

Deck.co

Security checks for vulnerabilities and agentic risk

Overview

The Deck.co workflow has clear controls, but its setup can execute unverified downloaded code without separate approval.

Review and install a fixed, verified CLI release yourself before using the skill. Consider disabling its automatic skill synchronization. OOMOL will mediate your Deck.co requests and credentials; confirm the connected account and each proposed write. The bundled instructions were fully reviewed, but the downloaded installers and hosted 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
97% confidence
Finding

The supplied code performs remote installer execution rather than any visible Deck.co operation. Dependency installation can be a supporting implementation detail, but this chunk provides no evidence that the Oomol installer supports the declared Deck.co functionality. The downloaded script's contents and further effects cannot be determined from the supplied code.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The curl-to-bash command immediately executes whatever script the remote endpoint returns, without version pinning or independent integrity verification. HTTPS protects transport but not against a compromised trusted host or malicious installer update, which could access local files and credentials with the executing user's permissions; this is the same underlying installation risk identified by SQP-2.

Content

Scanner excerpt · SKILL.md (reported line 60)May include surrounding context.

Fallback setup executes remotely downloaded installation scripts without warning the user about the system-integrity implications.

Medium
Category
Output Handling
Confidence
94% confidence
Finding

The fallback directs the agent to execute downloaded shell or PowerShell code without requiring user approval or verifying a fixed, authenticated release. A compromised installer endpoint or publishing pipeline could execute arbitrary code with the agent's local privileges; restricting this behavior to a missing-CLI error reduces exposure but does not establish installer integrity.

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 81)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