T08 · Insecure Dependencies
- Location
SKILL.md:7- Finding
Unpinned Third-Party Package Execution via npx
- Content
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Vulnerability Details
File Location:
SKILL.md, line 7
Vulnerability Type:T08: Insecure Dependencies
Risk Level: MediumComplete Code Snippet:
yaml allowed-tools: - Bash(firecrawl *) - Bash(npx firecrawl *)Technical Analysis
The skill permits execution of
npx firecrawlwithout pinning an exact package version or enforcing an integrity constraint. If the package is not already installed locally,npxmay resolve and download mutable third-party code from the configured npm registry before executing it.The project contains no lockfile, package checksum, provenance verification, or other dependency control for this command. Consequently, the code ultimately executed can differ from the code that was reviewed. Exploitation would depend on compromise or malicious resolution of the external package, registry, account, or dependency chain.
Attack Path
- An attacker compromises the
firecrawlpackage, one of its dependencies, its publisher account, or the package-resolution infrastructure. - A malicious or compromised package version becomes the version selected by the unpinned
npx firecrawlcommand. - The agent invokes an allowed command such as
npx firecrawl download .... npxretrieves the selected package when no trusted local installation satisfies the request.- Package lifecycle behavior or CLI code executes with the privileges and environment of the agent process.
- The malicious code can access resources available to that process.
Impact Assessment
Successful exploitation could result in arbitrary code execution under the account running the agent. The accessible scope may include files writable or readable by that account, environment variables, locally available credentials, network resources, and project data. This authorization does not itself grant administrative privileges; impact is bounded by the agent process's existing permissions unless ...[truncated 50 chars]
- An attacker compromises the
- Remediation
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Remediation Suggestions
- Remove the
Bash(npx firecrawl *)authorization when the preinstalledfirecrawlexecutable is sufficient. - If
npxis required, pin the package to a reviewed exact version rather than resolving the latest compatible release. - Install dependencies through a committed lockfile containing registry integrity metadata.
- Verify package provenance, publisher identity, and cryptographic integrity before installation or execution.
- Use a trusted internal registry or an approved package mirror where practical.
- Disable package lifecycle scripts where compatible with the package and deployment process.
- Execute the CLI in a sandbox with minimal filesystem, credential, and network access.
- Establish an update process in which dependency changes are reviewed and tested before deployment.
- Remove the