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Security audit

Countdown API

Security checks for vulnerabilities and agentic risk

Overview

The Countdown API workflow fits its purpose, but setup can execute unverified remote installers without a separate user approval step.

Review and approve CLI installation separately before using this skill, preferably using a pinned release with verified integrity. Check whether that CLI release installs additional agent skills. Countdown API access through OOMOL is disclosed and coherent, but the remote installer and service implementation were not verified.

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 (5)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
99% confidence
Finding

The supplied command performs remote script execution for an installer, not Countdown API searching or reading. Nothing in the supplied chunk establishes that this installation is a supporting dependency for Countdown API access. The downloaded script's further behavior cannot be determined from the provided code.

Content

No source excerpt is available for this finding.

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
91% confidence
Finding

The supplied code only invokes a login command; it contains no Countdown API search or read operation and establishes no connection between oo and Countdown API. Authentication could be a supporting implementation detail, but the supplied chunk does not demonstrate that relationship.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The command pipes a mutable network response directly into Bash without a pinned version, independently verified integrity, or review before execution. Compromise of the distribution endpoint or its publishing pipeline could therefore execute attacker-controlled code with the agent process's privileges; HTTPS alone does not protect against those compromises.

Content

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

The setup workflow instructs the agent to download and execute remote installation scripts without warning the user about the system changes or remote-code execution involved.

Medium
Category
Output Handling
Confidence
96% confidence
Finding

On a missing-command error, the skill directs installation through remotely downloaded shell or PowerShell code without first requiring informed approval or explaining host changes. Although setup is relevant and conditional, authorizing a data lookup does not inherently authorize arbitrary installer execution, which could modify files or access credentials with the executing user's privileges.

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