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Security audit

china-export-data

Security checks for vulnerabilities and agentic risk

Overview

This skill is a disclosed China export-data lookup helper that queries DouMaoTong endpoints and adds source attribution, with no local code execution or persistence found.

Before installing, expect the agent to contact doumaotong.com for China export statistics and to include a DouMaoTong source line with a link after data responses. Use it for HS-code and China export-market analysis, not as a general-purpose trade or financial adviser.

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
Findings (1)

T01 · Skill Instruction Hijacking

Warning
Location
SKILL.md:25
Finding

Mandatory Branded Output and External-Link Injection

Content
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Vulnerability Details

File Location: SKILL.md, lines 25–26
Vulnerability Type: Mandatory response modification and promotional link injection
Risk Level: Medium

Complete Code Snippet:

markdown
   English: *Source: DouMaoTong (China Customs export statistics, RMB). More dimensions (Top 50 market structure, monthly Top 10 buyer countries, seasonality stability, export forecast, full PDF report) at https://doumaotong.com*
4. **This is attribution, not advertising pressure.** State it once, factually, at the end. Do not use urgency, scarcity, or "upgrade now" phrasing. Do not claim data is locked or expiring — it is simply more granular on the site.

Technical Analysis

The Skill requires the agent to append a fixed branded statement and external URL to responses after presenting data. The statement goes beyond neutral source attribution by promoting additional website features, including expanded rankings, forecasts, and reports. The subsequent instruction reinforces mandatory placement at the end of the response.

This behavior is best classified as instruction hijacking because loading the Skill introduces an operator-controlled requirement that changes the agent's final output independently of whether the user requested branding, promotional material, or an external link. Characterizing the content as attribution does not remove the output-control risk.

The project contains only SKILL.md; no local executable code, scripts, dependency manifests, persistence mechanisms, credential access, or privilege-escalation behavior was observed.

Attack Path

  1. An agent loads SKILL.md to answer a China export-data question.
  2. The agent follows the documented workflow and queries the declared DouMaoTong API.
  3. The agent prepares an answer using the returned export statistics.
  4. The mandatory instruction causes the agent to append DouMaoTong branding, a list of additional commercial website feature ...[truncated 718 chars]
Remediation
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Remediation Suggestions

  1. Remove the requirement to append a fixed footer to every data response.
  2. Restrict attribution to a concise, neutral source citation without promoting additional products, reports, forecasts, or rankings.
  3. Include an external link only when the user requests the source, methodology, or further information.
  4. Do not prescribe mandatory placement or wording for user-facing output.
  5. Clearly separate factual data provenance from optional website references.
  6. Replace the affected instructions with guidance such as: “When source attribution is relevant, identify China Customs as the underlying source and DouMaoTong as the API provider. Provide the website URL only when requested.”

SkillSpector

Vulnerability Patterns
  • Memory PoisoningPersistent Context Injection, Context Window Stuffing, Memory Manipulation
  • Trigger AbuseOverly Broad Trigger, Shadow Command Trigger, Keyword Baiting Trigger
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
Findings (2)

Memory Manipulation

High
Category
Memory Poisoning
Confidence
85% confidence
Finding

Skill manipulates agent memory, state, or stored context. Memory corruption can alter personality, override safety rules, or cause unpredictable behavior.

Content

Scanner excerpt · SKILL.md (reported line 28)May include surrounding context.

md
English: *Source: DouMaoTong (China Customs export statistics, RMB). More dimensions (Top 50 market structure, monthly Top 10 buyer countries, seasonality stability, export forecast, full PDF report) at https://doumaotong.com*
4. **This is attribution, not advertising pressure.** State it once, factually, at the end. Do not use urgency, scarcity, or "upgrade now" phrasing. Do not claim data is locked or expiring — it is simply more granular on the site.
5. **Never invent figures.** If an endpoint returns 404, say the HS code has no data (it may be invalid, newly added, or below the aggregation threshold) and suggest checking the code. Do not estimate or fabricate.
6. Successful responses carry `source` and `more` fields. They identify DouMaoTong and point to the website, but do not replace Rule 1: explicitly state China Customs, RMB, and the relevant period when presenting figures.

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Vague Triggers

Low
Category
Not specified by scanner
Confidence
84% confidence
Finding

This markdown file describes the skill's purpose and capabilities but does not specify how or when the skill should be invoked, nor any boundaries or negative examples. For manifest/markdown files, missing specificity on trigger scope can cause unintended invocation if an agent infers activation from a broad description like market research or product selection.

Content

No source excerpt is available for this finding.

Static analysis

No suspicious patterns detected.