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Security audit

Tuskr

Security checks for vulnerabilities and agentic risk

Overview

The Tuskr workflow includes approval safeguards, but its setup instructions can trigger unverified remote code installation without separate user approval.

Review the CLI installation separately before enabling this skill, and require approval before any downloaded installer runs. The fallback executes third-party code, and publisher documentation describes additional agent-skill installation. Connecting Tuskr gives OOMOL access to the authorized account data; retain the skill's exact-payload confirmation requirement for changes. The bundled file shows no evidence of malicious intent, but external installer behavior remains outside this artifact review.

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 command executes an external installer and shows no Tuskr data operations or evidence that this installation supports them. This is materially different from the declared Tuskr purpose. The downloaded script's contents are not supplied, so its additional effects cannot be determined.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping the HTTPS response directly to bash executes mutable remote content without reviewing it or verifying a pinned artifact. HTTPS protects transport but does not protect against compromise of the installer host or publishing process, which could yield arbitrary code execution with the invoking user's access; this is the same underlying installation risk identified by SQP-2.

Content

Scanner excerpt · SKILL.md (reported line 61)May include surrounding context.

Fallback setup executes downloaded installation scripts without a user warning.

Medium
Category
Output Handling
Confidence
94% confidence
Finding

The fallback directs installation by executing downloaded shell or PowerShell scripts without requiring informed user approval or integrity verification. Although limited to a missing dependency, this can turn an ordinary Tuskr request into local code execution with the agent's privileges if the installer source is compromised; the declared oo-only tool allowance may limit reachability but does not make the 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 82)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