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Security audit

signallayer-preflight

Security checks for vulnerabilities and agentic risk

Overview

This skill is a clearly disclosed payment-risk preflight guide, but users should be careful with its optional live-payment and unpinned CLI examples.

Install only if you are comfortable sending target URLs or Base addresses to SignalLayer for analysis. Do not run the AWAL payment example unless you have verified the package, wallet, recipient, Base USDC asset, and 0.01 USDC cap, and have explicitly approved that spend.

A.I.G

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

SkillSpector

Vulnerability Patterns
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
  • MCP Tool PoisoningHidden Instructions, Unicode Deception, Parameter Description Injection
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
Findings (10)

Tp4

High
Category
MCP Tool Poisoning
Confidence
98% confidence
Finding

The declared description says the skill is for security/risk preflight on x402 endpoints and Base addresses before purchases or wallet interactions. The supplied code does something materially different: it is a local sanity-check script for the skill repository itself. It reads SKILL.md and README.md, asserts the presence of certain metadata and strings, checks for required files, and ensures likely secrets are not present in docs. It explicitly states 'no hosted API requests' and contains no logic for evaluating x402 payment terms, Base recipients, blockchain data, endpoint safety, or user-authorized transactions. This is a clear description-behavior mismatch with a different primary purpose.

Content

No source excerpt is available for this finding.

Rp1

Medium
Category
MCP Rug Pull
Confidence
70% confidence
Finding

npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Content

No source excerpt is available for this finding.

Rp1

Medium
Category
MCP Rug Pull
Confidence
70% confidence
Finding

npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Content

No source excerpt is available for this finding.

Rp1

Medium
Category
MCP Rug Pull
Confidence
93% confidence
Finding

This line instructs users to run npx awal@latest x402 pay ..., which can trigger a real USDC payment while relying on an unpinned package version fetched at execution time. In a wallet/payment context, an upstream package compromise could alter transaction behavior, exfiltrate credentials, or redirect funds, making the risk materially more dangerous than ordinary CLI usage.

Content

No source excerpt is available for this finding.

Undeclared Tool Scope

Medium
Category
MCP Least Privilege
Confidence
70% confidence
Finding

Without declared permissions the skill's intent is opaque and cannot be validated.

Content

No source excerpt is available for this finding.

External Transmission

Medium
Category
Data Exfiltration
Confidence
60% confidence
Finding

Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.

Content

Scanner excerpt · SKILL.md (reported line 52)May include surrounding context.

Unpaid example

bash
curl --get 'https://signallayer.floot.app/_api/v1/agent/preflight' \
  --data-urlencode 'target=https://example.com/' \
  --data-urlencode 'intent=pay'

Rp1

Medium
Category
MCP Rug Pull
Confidence
82% confidence
Finding

Using npx awal@latest pulls whatever package version is current at execution time, which creates a supply-chain risk and undermines reproducibility. If the upstream package is compromised or introduces breaking behavior, an agent or user following the example could execute unreviewed code in a payment-related workflow.

Content

No source excerpt is available for this finding.

Rp1

Medium
Category
MCP Rug Pull
Confidence
70% confidence
Finding

npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Content

No source excerpt is available for this finding.

Rp1

Medium
Category
MCP Rug Pull
Confidence
70% confidence
Finding

npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Content

No source excerpt is available for this finding.

Rp1

Medium
Category
MCP Rug Pull
Confidence
70% confidence
Finding

npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.