Back to skill

Security audit

Sif

Security checks for vulnerabilities and agentic risk

Overview

Review is warranted because the skill directs automatic installation from a live remote script without clearly controlling or explaining its local changes.

Review and approve the CLI installation separately, using a verified release where available. Check and control its automatic agent-skill synchronization before running it. Expect Sif requests to pass through OOMOL and consume disclosed service credits. The full remote installer behavior could not be verified; the supplied artifact does not establish malicious intent.

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
96% confidence
Finding

The supplied chunk performs remote software installation rather than searching or reading Sif data. No code establishes that this installer is a supporting dependency for Sif access. The downloaded script is not supplied, so its further behavior cannot be assessed.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

The command pipes a remotely fetched, unpinned script directly into Bash without inspecting or independently verifying the executable content; the PowerShell alternative uses the same execution pattern. Compromise of the installer endpoint or its publishing chain could execute attacker-controlled code with the agent's local permissions, potentially exposing accessible credentials or modifying files. HTTPS and the legitimate dependency relationship do not protect against a compromised publisher.

Content

Scanner excerpt · SKILL.md (reported line 66)May include surrounding context.

Fallback setup executes remote installation scripts without warning about local system changes.

Medium
Category
Output Handling
Confidence
96% confidence
Finding

When the CLI is missing, the fallback directs the agent to install software without first explaining local system changes or obtaining explicit approval. A request to read Sif data does not inherently authorize running an installer, which can modify files and configuration under the agent's operating-system account; the conditional fallback limits exposure but does not establish consent.

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 87)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