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Security audit

Tongcheng Chengxin

Security checks for vulnerabilities and agentic risk

Overview

The travel searches fit the stated purpose, but automatic setup executes unverified remote code and leaves broader agent changes undisclosed.

Review and install the CLI separately before using this skill. Verify the downloaded release and decide whether automatic skill synchronization across your agents is acceptable; upstream documents OO_SKILLS_SYNC_DISABLED=1 to disable startup synchronization. Searches use your OOMOL-connected account and may consume credit. The remote installer was unavailable for inspection, so its exact changes remain uncertain. No malicious intent or exfiltration 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
  • 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 chunk performs remote script execution and contains no Tongcheng search or read operation. Although installation can support a skill, the provided content does not establish that this installer is a supporting dependency for the declared purpose. The downloaded script's contents and subsequent effects are not available for assessment.

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 content without an independently verified signature or pinned artifact. Although the URL is consistent with the documented CLI provider, compromise of its hosting or release pipeline could execute attacker-controlled code with the agent's permissions, exposing accessible files and credentials; the PowerShell alternative has the same risk.

Content

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

Fallback setup executes downloaded installation scripts without warning about remote code execution or system changes.

Medium
Category
Output Handling
Confidence
95% confidence
Finding

The fallback directs the agent to execute downloaded shell or PowerShell code without first explaining the system changes or obtaining installation approval. Restricting this behavior to a missing CLI reduces its frequency, but dependency installation still expands a read-only search task into potentially arbitrary code execution under the agent's account.

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