T09 · Insecure Skill Coding Practices
Warning
- Location
uptimecheck.py:12- Finding
Unrestricted URL Requests Enable Blind Server-Side Request Forgery
- Content
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- Remediation
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Security audit
Uptimecheck
Security checks for vulnerabilities and agentic risk
Overview
This is a straightforward uptime-checking skill with expected network checks and optional local history, though users should avoid untrusted or secret-bearing URLs.
Install this only if you are comfortable letting it make outbound checks to URLs you provide. Do not run URL lists from untrusted people, and avoid saving checks for URLs that contain API keys, signed parameters, session tokens, or private internal hostnames.
Vulnerability Patterns
- Insecure Skill Coding PracticesFinds exploitable flaws such as hardcoded secrets or command injection
- 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
Findings (2)
T09 · Insecure Skill Coding Practices
Note
- Location
uptimecheck.py:39- Finding
Complete URLs May Be Persisted in Plaintext History
- Content
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- Remediation
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Vulnerability Patterns
- MCP Least PrivilegeUnderdeclared Capability, Wildcard Permission, Missing Permission Declaration
- Prompt InjectionInstruction Override, Hidden Instructions, Exfiltration Commands
- Data ExfiltrationExternal Transmission, Env Variable Harvesting, File System Enumeration
- Privilege EscalationExcessive Permissions, Sudo/Root Execution, Credential Access
- Supply ChainUnpinned Dependencies, External Script Fetching, Obfuscated Code
Findings (1)
Undeclared Tool Scope
Medium
- Category
- MCP Least Privilege
- Confidence
- 95% confidence
- Finding
The skill advertises and operationally requires network access, file reads, and file writes, but it does not declare any explicit tool scope or permissions boundary. This creates an authorization gap where an agent runtime or reviewer cannot easily enforce least privilege, increasing the risk of unintended outbound requests, reading arbitrary local files via batch input, or persisting data to disk without clear user consent.
- Content