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Security audit

Hamsa

Security checks for vulnerabilities and agentic risk

Overview

A routine Hamsa lookup can lead to unverified software installation and broader agent changes without a clear approval step.

Review the setup before enabling this skill. Install a reviewed, pinned CLI release yourself, require approval for installation commands, and review or disable automatic skill synchronization. OOMOL mediates access to your connected Hamsa account. The remote installers and hosted implementation were not verified; no artifact evidence establishes 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
98% confidence
Finding

The declared purpose is Hamsa data access, but the supplied command executes an Oomol installer without showing any connection to that purpose. This introduces remote code execution against an inconsistent resource, rather than a demonstrated supporting implementation detail. The downloaded script's further behavior cannot be determined from this chunk.

Content

No source excerpt is available for this finding.

External Script Fetching

High
Category
Supply Chain
Confidence
98% confidence
Finding

Piping an HTTPS download directly into Bash executes mutable remote content without independent integrity verification or an opportunity to inspect it first; the PowerShell example has the same property. If the installer source or delivery infrastructure is compromised, attacker-controlled code could run with the invoking user's permissions, potentially accessing local secrets and modifying files.

Content

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

The setup fallback executes remotely downloaded installation scripts without warning about local system changes or remote-code execution.

Medium
Category
Output Handling
Confidence
95% confidence
Finding

The missing-CLI fallback directs installation through remotely executed scripts without requiring informed user approval for local software installation. The conditional setup context reduces exposure, but a routine read request could still lead an agent to make unexpected system changes; the declared tool restriction may constrain execution but is not an explicit consent safeguard.

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