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Security audit

Base toolbox

Security checks for vulnerabilities and agentic risk

Overview

This skill is a disclosed paid Base blockchain helper that sends selected transaction details to a remote API only after user confirmation and does not sign or submit transactions itself.

Use this only when you are comfortable sharing the shown wallet or transaction fields with the named API operator and PayAI. Confirm the price and endpoint each time, and do not approve or sign any transaction unless the separate local verification and human confirmation steps match your 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
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (2)

Vague Triggers

Medium
Category
Not specified by scanner
Confidence
91% confidence
Finding

The trigger list includes broad terms such as 'allowance', 'revoke', and 'ENS' that can match common user requests and cause this skill to activate unexpectedly. Unintended invocation increases the chance that wallet addresses, calldata, or payment prompts are introduced into conversations where the user did not specifically request this external paid service.

Content

No source excerpt is available for this finding.

External Transmission

Medium
Category
Data Exfiltration
Confidence
84% confidence
Finding

The skill instructs the agent to send POST requests containing potentially sensitive transaction-related fields to a third-party origin, and explicitly notes that the operator may log wallet, token, recipient, and calldata data. Even though the document includes consent and payment safeguards, this is still an external data transmission path that can expose user financial metadata and transaction intent to an untrusted remote service.

Content

Scanner excerpt · SKILL.md (reported line 68)May include surrounding context.

  • USD price / gas / .eth only → matching $0.001 route.
text
curl -sS -D - -X POST https://basetoolbox.cartonpliant.workers.dev/v1/base-gas \
  -H 'content-type: application/json' -d '{}'