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Security audit

Kuaidi100

Security checks for vulnerabilities and agentic risk

Overview

The shipping workflow includes sensible safeguards, but its fallback setup directs the agent to execute unverified downloaded code without separate approval.

Review the CLI installation separately before enabling this skill. Prefer a verified, pinned release and check its automatic installation of other agent skills. Connect only the intended account and understand that shipping details are processed through OOMOL. The remote installer and CLI implementation remain outside the inspected artifact; no malicious behavior was established.

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
  • 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
Findings (5)

Description-Behavior Mismatch

High
Category
MCP Tool Poisoning
Confidence
95% confidence
Finding

The supplied chunk performs remote software installation rather than a demonstrated Kuaidi100 operation. Nothing provided establishes this installer as a necessary supporting implementation detail for the declared purpose. The downloaded script is not included, 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

Piping the HTTPS response directly into Bash executes mutable remote code without release pinning or independent integrity verification; the PowerShell alternative has the same weakness. A compromised installer host or publishing pipeline could execute arbitrary commands with the user's permissions, although the documented dependency relationship provides no evidence of malicious intent.

Content

Scanner excerpt · SKILL.md (reported line 63)May include surrounding context.

The setup workflow executes downloaded installation scripts without warning the user or requesting approval.

Medium
Category
Output Handling
Confidence
96% confidence
Finding

The setup workflow directs the agent to execute downloaded installation code when the CLI is missing, without requiring explicit approval for this local code execution and system modification. Restricting installation to a missing-dependency condition reduces exposure, but does not make a Kuaidi100 task sufficient authorization to run an installer with the invoking user's permissions.

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 84)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

External Transmission

Medium
Category
Data Exfiltration
Confidence
50% 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 89)May include surrounding context.

md
## Resources

- Kuaidi100 homepage: https://www.kuaidi100.com/
- API documentation: https://api.kuaidi100.com/document/how-to-use-mcp-service