T08 · Insecure Dependencies
- Location
SKILL.md:126- Finding
Unpinned Third-Party Package Execution via npx
- Content
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Vulnerability Details
File Location:
SKILL.md, lines 126–130
Vulnerability Type: Insecure third-party dependency execution
Risk Level: Mediumbash # 本地预览（任选其一） python -m http.server 8000 npx serve .Technical Analysis
The quick-start instructions recommend running
npx serve .without specifying a package version or requiring a reviewed lockfile. Ifserveis not already installed locally,npxcan download the package and execute it directly from the configured package registry.Because the package version and integrity are not pinned, the code executed at audit time may differ from the code retrieved later. A compromised package release, maintainer account, transitive dependency, or package registry could therefore introduce arbitrary code into this workflow. The built-in Python server shown immediately above does not introduce the same package supply-chain exposure.
Attack Path
- An attacker compromises the
servepackage, one of its executable dependencies, its publisher account, or the configured package registry. - A user or agent follows the documented quick-start workflow and executes
npx serve .. - When no suitable reviewed local installation is available,
npxretrieves the currently resolved package and dependencies. - The downloaded package code executes with the privileges and environment of the invoking user or agent.
- Malicious code can access resources available to that process and perform actions within its operating-system permissions.
Impact Assessment
Successful exploitation permits arbitrary code execution with the privileges of the account running
npx. Depending on that account and its environment, the malicious package could read or modify accessible project files, inspect available environment variables, alter generated artifacts, initiate network connections, or compromise other data available to the process.The impact is generally limit ...[truncated 227 chars]
- An attacker compromises the
- Remediation
View remediation
Remediation Suggestions
- Remove the
npx serve .recommendation and retain the built-inpython -m http.server 8000option where appropriate. - If the Node.js server is required, declare an explicitly reviewed version in
package.json, install it using a committed lockfile with integrity metadata, and invoke the local binary through a package script. - Use deterministic installation such as
npm cirather than resolving mutable dependency versions at execution time. - Review direct and transitive dependencies before upgrades, and use automated dependency and provenance scanning.
- Run preview servers under a least-privileged account or sandbox without sensitive environment variables or unnecessary filesystem access.
- Bind the preview server to the loopback interface unless remote access is explicitly required.
- Remove the