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Security audit

zillow-search

Security checks for vulnerabilities and agentic risk

Overview

This is a coherent property-search skill that uses Zillapi as disclosed and does not show hidden persistence, unrelated data access, or destructive behavior.

Install this only if you are comfortable with Zillapi receiving your search locations, bounding boxes, filters, and API key for each query. Use a dedicated Zillapi key, keep max_items low, and confirm broad searches because returned listings consume API credits.

SkillSpector

Vulnerability Patterns
  • Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
  • MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
  • Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
  • Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
  • Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (5)

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.

Missing User Warnings

Medium
Category
Not specified by scanner
Confidence
88% confidence
Finding

The handler transmits search parameters such as location or bounding box to the external Zillapi service via an HTTP request. While the module docstring names the API and the environment variable, there is no confirmation prompt, user-facing log, or warning that user-provided search data will be sent to a third party.

Content

No source excerpt is available for this finding.

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 76)May include surrounding context.

md
- OpenAPI spec: <https://zillapi.com/openapi.json>
- REST docs: <https://zillapi.com/api/properties/>
- Hosted MCP server (alternative to this skill): <https://api.zillapi.com/mcp>

## Trademark

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 · handler.py (reported line 13)May include surrounding context.

python
import urllib.parse
import urllib.request

API_BASE = "https://api.zillapi.com/v1"
USER_AGENT = "zillow-skills/1.1.0 (+https://github.com/ZeroPointRepo/zillow-skills)"
TIMEOUT_SECONDS = 30

Env Variable Harvesting

High
Category
Data Exfiltration
Confidence
70% confidence
Finding

Code accesses environment variables that may contain secrets (API keys, tokens). This is a common pattern for credential theft.

Content

Scanner excerpt · handler.py (reported line 19)May include surrounding context.

python
def _key():
    k = os.environ.get("ZILLAPI_KEY", "").strip()
    if not k:
        raise RuntimeError(
            "ZILLAPI_KEY environment variable is not set. "

Static analysis

No suspicious patterns detected.